Academic literature on the topic 'Postural tremor'
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Journal articles on the topic "Postural tremor"
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Dirkx, Michiel F., Heidemarie Zach, Bastiaan R. Bloem, Mark Hallett, and Rick C. Helmich. "The nature of postural tremor in Parkinson disease." Neurology 90, no. 13 (February 23, 2018): e1095-e1103. http://dx.doi.org/10.1212/wnl.0000000000005215.
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ObjectiveTo disentangle the different forms of postural tremors in Parkinson disease (PD).MethodsIn this combined observational and intervention study, we measured resting and postural tremor characteristics in 73 patients with tremulous PD by using EMG of forearm muscles. Patients were measured both “off” medication (overnight withdrawal) and after dispersible levodopa-benserazide 200/50 mg. We performed an automated 2-step cluster analysis on 3 postural tremor characteristics: the frequency difference with resting tremor, the degree of tremor suppression after posturing, and the dopamine response.ResultsThe cluster analysis revealed 2 distinct postural tremor phenotypes: 81% had re-emergent tremor (amplitude suppression, frequency difference with resting tremor 0.4 Hz, clear dopamine response) and 19% had pure postural tremor (no amplitude suppression, frequency difference with resting tremor 3.5 Hz, no dopamine response). This finding was manually validated (accuracy of 93%). Pure postural tremor was not associated with clinical signs of essential tremor or dystonia, and it was not influenced by weighing.ConclusionThere are 2 distinct postural tremor phenotypes in PD, which have a different pathophysiology and require different treatment. Re-emergent tremor is a continuation of resting tremor during stable posturing, and it has a dopaminergic basis. Pure postural tremor is a less common type of tremor that is inherent to PD, but has a largely nondopaminergic basis.
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Samsonova, T. V., S. B. Nazarov, A. A. Chistyakova, and Yu A. Ryl'skaya. "Postural tremor in children with motor development disorders in their first twelve months of life." Rossiyskiy Vestnik Perinatologii i Pediatrii (Russian Bulletin of Perinatology and Pediatrics) 66, no. 5 (December 8, 2021): 56–59. http://dx.doi.org/10.21508/1027-4065-2021-66-5-56-59.
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At the first year of a child’s life begins a gradual transition to verticalization through the sequential development of anti-gravity postures. During the maintain of these poses occurs the active muscle contraction and appears a postural tremor.Purpose: To identify the features of postural tremor while holding the first antigravity postures in children with motor development disorders and to develop a new method for its diagnosing in children in the first six months of life. During the first year of life, the child gradually moves to verticalization through the sequential development of anti-gravity postures. To maintain these postures, the child actively contracts muscles, causing postural tremor.Objective. To reveal the features of postural tremor while holding the first antigravity postures in children with motor development disorders and to develop a new diagnostic method in the first six months of life. Children characteristics and research methods. The authors examined 33 children with impaired motor development and 10 children without neurological pathology at the age of 3–5 months. All children underwent neurological examination and study of postural tremor according to our method.Results. The authors established the features of postural tremor in children with impaired motor development at the age of 3-5 months compared with healthy children, manifested in amplitude increase. The authors presented their own for recording postural tremor in children of the first six months of life at the stage of mastering the first antigravity postures. There are presented the results of the analysis postural tremor in children of 3-5 months with impaired motor development in comparison with healthy children. The article presents a new method for diagnosing impaired motor development in children of the first six months of life using the results of postural tremor research. The high diagnostic value of the developed method is shown
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Lukšys, Donatas, Gintaras Jonaitis, and Julius Griškevičius. "Quantitative Analysis of Parkinsonian Tremor in a Clinical Setting Using Inertial Measurement Units." Parkinson's Disease 2018 (June 21, 2018): 1–7. http://dx.doi.org/10.1155/2018/1683831.
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Background. Parkinson’s disease (PD) is a neurodegenerative disorder that affects human voluntary movements. Tremor is one of the most common symptoms of PD and is expressed as involuntary oscillation of the body. Tremors can be analysed in the frequency domain. Objective. The aim of the current study was to examine selected tremor parameters (frequency, root mean square, and approximated entropy) in order to quantify the characteristics of patients diagnosed with PD, compared to a healthy control group, and to compare the parameters by dividing the subjects according to UPDRS assessment. Methods. The subjects were divided into two groups: a group of people diagnosed with PD (n = 19) and a control group consisting of healthy volunteers (CO = 12). Each subject performed motor tasks specific to certain tremors: the finger-to-nose test. Each subject performed a motor task three times. A nine degree of freedom (DOF) wireless inertial measurement unit was used for the measurement of upper limb motor tasks. For the quantitative estimation of kinetic and postural tremors, dominant frequency, root means square, and approximation entropy were selected and calculated from the measured angular velocity and linear acceleration signals. A one-way ANOVA with a significance level of α = 0.05 was used to test the null hypothesis that the means of the tremor metrics were the same between the PD and CO groups. Results. Statistically significant differences between PD patients and control groups were observed in ApEn acceleration signal of kinetic tremor, ApEn angular velocity signal of kinetic tremor, ApEn angular velocity of postural tremor, frequency acceleration signal of postural tremor, and RMS angular speed kinetic tremor. Conclusion. Application of inertial measurement units for clinical research of patients and PD tremor evaluation allows providing quantitative information for diagnostic purposes, during screening in a clinical setting that differentiates between PD patients and controls.
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Obwegeser, Alois A., Ryan J. Uitti, Robert J. Witte, John A. Lucas, Margaret F. Turk, and Robert E. Wharen. "Quantitative and Qualitative Outcome Measures after Thalamic Deep Brain Stimulation to Treat Disabling Tremors." Neurosurgery 48, no. 2 (February 1, 2001): 274–84. http://dx.doi.org/10.1097/00006123-200102000-00004.
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Abstract OBJECTIVE We studied outcome measures after unilateral and bilateral thalamic stimulation to treat disabling tremor resulting from essential tremor and Parkinson's disease. The surgical technique, qualitative and quantitative tremor assessments, stimulation parameters, locations of active electrodes, complications, and side effects are described and analyzed. METHODS Forty-one patients with essential tremor or Parkinson's disease underwent implantation of 56 thalamic stimulators. Preoperative qualitative and quantitative tremor measurements were compared with those obtained after unilateral and bilateral surgery, with activated and deactivated stimulators. Stimulation parameters and stimulation-related side effects were recorded, and outcome measures were statistically analyzed. RESULTS Qualitative measurements demonstrated significant improvement of contralateral upper-limb (P < 0.001), lower-limb (P < 0.01), and midline (P < 0.001) tremors after unilateral surgery. Ipsilateral arm tremor also improved (P < 0.01). No differences were observed with the Purdue pegboard task. Quantitative accelerometer measurements were correlated with qualitative assessments and confirmed improvements in contralateral resting (P < 0.001) and postural (P < 0.01) tremors and ipsilateral postural tremor (P < 0.05). Activities of daily living improved after unilateral surgery (P < 0.001) and additionally after bilateral surgery (P < 0.05). Adjustments of the pulse generator were required more frequently for tremor control than for amelioration of side effects. Bilateral thalamic stimulation caused more dysarthria and dysequilibrium than did unilateral stimulation. Stimulation-related side effects were reversible for all patients. Stimulation parameters did not change significantly with time. A significantly lower voltage and greater pulse width were used for patients with bilateral implants. CONCLUSION Unilateral thalamic stimulation and bilateral thalamic stimulation are safe and effective procedures that produce qualitative and quantitative improvements in resting, postural, and kinetic tremor. Thalamic stimulation-related side effects are mild and reversible.
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Md Zain, Mohd Zarhamdy, Ali Zolfagharian, Moslem Mohammadi, Mahdi Bodaghi, Abd Rahim Abu Bakar, and Abbas Z. Kouzani. "A Portable Non-Contact Tremor Vibration Measurement and Classification Apparatus." Actuators 11, no. 1 (January 17, 2022): 26. http://dx.doi.org/10.3390/act11010026.
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Tremors are the most common type of movement disorder and affect the lives of those experiencing them. The efficacy of tremor therapies varies according to the aetiology of the tremor and its correct diagnosis. This study develops a portable measurement device capable of non-contact measurement of the tremor, which could assist in tremor diagnosis and classification. The performance of this device was assessed through a validation process using a shaker at a controlled frequency to measure human tremors, and the device was able to measure vibrations of 50 Hz accurately, which is more than twice the frequency of tremors produced by humans. Then, the device is tested to measure the tremors for two different activation conditions: rest and postural, for both hand and leg. The measured non-contact tremor vibration data successfully led to tremor classification in the subjects already diagnosed using a contact accelerometer.
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Sturman, Molly M., David E. Vaillancourt, and Daniel M. Corcos. "Effects of Aging on the Regularity of Physiological Tremor." Journal of Neurophysiology 93, no. 6 (June 2005): 3064–74. http://dx.doi.org/10.1152/jn.01218.2004.
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The purpose of this investigation was to determine the effects of healthy aging on the regularity of physiological tremor under rest and postural conditions. Additionally, we examined the contribution of mechanical reflex factors to age-related changes in postural physiological tremor. Tremor regularity, tremor–electromyographic (EMG) coherence, tremor amplitude, and tremor modal frequency were calculated for 4 age groups (young: 20–30 yr, young-old: 60–69 yr, old: 70–79 yr, and old-old: 80–94 yr) under resting and loaded postural conditions. There were 6 important findings from this study: 1) there were no differences between the young and elderly subjects for any of the dependent variables measured under the rest condition; 2) postural physiological tremor regularity was increased in the elderly; 3) postural physiological tremor-EMG coherence was also increased in the elderly, and there was a strong linear relation between peak tremor-EMG coherence in the 1- to 8-Hz frequency band and regularity of tremor. This relation was primarily driven by the increased magnitude of tremor-EMG coherence at 5.85 and 6.83 Hz; 4) enhanced mechanical reflex properties were not responsible for the increased magnitude of tremor-EMG coherence in the elderly subjects; 5) tremor amplitude was not different between the 4 age groups, but there was a slight decline in tremor modal frequency in the oldest age group in the unloaded condition; and 6) despite the increases in postural physiological tremor regularity and the magnitude of low frequency tremor-EMG coherence with age, there was a clear demarcation between healthy aging and previously published findings related to tremor pathology.
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DELEU, D. "Toluene induced postural tremor." Journal of Neurology, Neurosurgery & Psychiatry 68, no. 1 (January 1, 2000): 118. http://dx.doi.org/10.1136/jnnp.68.1.118.
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Brown, P., J. C. Rothwell, J. M. Stevens, A. J. Lees, and C. D. Marsden. "Cerebellar axial postural tremor." Movement Disorders 12, no. 6 (November 1997): 977–84. http://dx.doi.org/10.1002/mds.870120622.
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Luft, Frauke, Sarvi Sharifi, Winfred Mugge, Alfred C. Schouten, Lo J. Bour, Anne-Fleur van Rootselaar, Peter H. Veltink, and Tijtske Heida. "A Power Spectral Density-Based Method to Detect Tremor and Tremor Intermittency in Movement Disorders." Sensors 19, no. 19 (October 4, 2019): 4301. http://dx.doi.org/10.3390/s19194301.
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There is no objective gold standard to detect tremors. This concerns not only the choice of the algorithm and sensors, but methods are often designed to detect tremors in one specific group of patients during the performance of a specific task. Therefore, the aim of this study is twofold. First, an objective quantitative method to detect tremor windows (TWs) in accelerometer and electromyography recordings is introduced. Second, the tremor stability index (TSI) is determined to indicate the advantage of detecting TWs prior to analysis. Ten Parkinson’s disease (PD) patients, ten essential tremor (ET) patients, and ten healthy controls (HC) performed a resting, postural and movement task. Data was split into 3-s windows, and the power spectral density was calculated for each window. The relative power around the peak frequency with respect to the power in the tremor band was used to classify the windows as either tremor or non-tremor. The method yielded a specificity of 96.45%, sensitivity of 84.84%, and accuracy of 90.80% of tremor detection. During tremors, significant differences were found between groups in all three parameters. The results suggest that the introduced method could be used to determine under which conditions and to which extent undiagnosed patients exhibit tremors.
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Romanelli, Pantaleo, Helen Bronté-Stewart, Tracy Courtney, and Gary Heit. "Possible necessity for deep brain stimulation of both the ventralis intermedius and subthalamic nuclei to resolve Holmes tremor." Journal of Neurosurgery 99, no. 3 (September 2003): 566–71. http://dx.doi.org/10.3171/jns.2003.99.3.0566.
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✓ Holmes tremor is characterized by resting, postural, and intention tremor. Deep brain stimulation (DBS) of both the nucleus ventralis intermedius (Vim) and the subthalamic nucleus (STN) may be required to control these three tremor components. A 79-year-old man presented with a long-standing combination of resting, postural, and intention tremor, which was associated with severe disability and was resistant to medical treatment. Neuroimaging studies failed to reveal areas of discrete brain damage. A DBS device was placed in the Vim and produced an improvement in both the intention and postural tremor, but there was residual resting tremor, as demonstrated by clinical observation and quantitative tremor analysis. Placement of an additional DBS device in the STN resolved the resting tremor. Stimulation of the Vim or STN alone failed to produce global resolution of mixed tremor, whereas combined Vim—STN stimulation produced global relief without creating noticeable side effects. Combined Vim—STN stimulation can thus be a safe and effective treatment for Holmes tremor.
Dissertations / Theses on the topic "Postural tremor"
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Geiger, Daniel William. "Characterization of Postural Tremor in Essential Tremor Using a Seven-Degree-of-Freedom Model." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/5684.
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Essential Tremor (ET), a condition characterized by postural and kinetic tremor in the upper limbs, is one of the most prevalent movement disorders. While pharmaceutical and surgical treatment options exist, they are not ideal. Assistive devices have the potential to provide relief to patients but are largely unexplored for ET. Furthermore, prior characterizations of essential tremor have focused on endpoint tremor and provide insufficient detail for designing such a device. We propose and demonstrate a novel method for characterizing essential tremor in the 7 proximal degrees of freedom (DOF) of the upper limb in various postures. In addition, we provide a preliminary characterization in a small number of patients with mild ET. We collected data from 10 patients with ET. Subjects were instrumented with four electromagnetic sensors that recorded orientation of upper limb segments. After a calibration, each subject positioned his/her upper limb in 16 different postures for 15 seconds each. This procedure was repeated 4 times for each subject, with each repetition being considered a run. Sensor data were converted to angular kinematic data for each DOF using inverse kinematics, a practice unique to this study. These data were then analyzed in the frequency domain to calculate the power associated with the tremor in each DOF and posture. More specifically, we computed the area of the periodogram over the 4-12 Hz frequency band typically associated with ET [narrow-band area (NBA)] and over the wider frequency band from 2 Hz to the Nyquist frequency [wide-band area (WBA)]. If significant peaks were found in the 4-12 Hz band, their frequency and amplitude were reported. Mixed-model ANOVA tests were used to investigate effects of DOF, posture, run, gravity, and patient characteristics on reported measures. NBA and WBA varied significantly between DOF, being lowest in the wrist, intermediate in the shoulder, and greatest in the elbow and forearm (pronation-supination). NBA and WBA also varied significantly with posture. Only 5% of observations had significant peaks, with 49% of peaks occurring in wrist flexion-extension and 39% occurring in wrist radial-ulnar deviation. Peak frequency was quite stereotyped (5.7 Hz ± 1.3Hz). Run had no significant effects, indicating that tremor measures were consistent over the duration of the experiment. Effects of gravity and demographic factors on measures were mixed and did not present a discernible pattern. This preliminary characterization suggests that tremor may be focused in a subset of upper limb DOF, being greatest (in terms of power) in elbow flexion-extension and forearm pronation-supination, and most concentrated (with peaks at a stereotyped frequency) in wrist flexion-extension and radial-ulnar deviation. Our method of 7 DOF characterization through inverse kinematics, in conjunction with future research (isolation studies, EMG, and finger DOF) may allow for optimal tremor suppression by an orthosis.
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Keogh, Justin W. L., and n/a. "Constraints on the Control of Physiological Tremor." Griffith University. School of Physiotherapy and Exercise Science, 2006. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20070208.110453.
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This thesis sought to: 1) examine the effect of a number of organism and task constraints on the control of two forms of physiological tremor, namely postural and finger-pinch force tremor; and 2) determine if the expected constraint-related changes in tremor output were associated with alterations in the control strategy utilised by the performer. The organism constraints were age and resistance-training (for both forms of tremor), while the task constraints were visual feedback, target size and limb preference (postural tremor) and mean force, target shape and limb preference (force tremor). The postural (index finger) tremor amplitude of young adults was significantly greater in the augmented vision (AV) than normal vision (NV) conditions and when using the non-preferred than preferred limb. Even greater differences/changes in postural tremor amplitude were observed as a function of aging and training. Older adults had significantly more index finger tremor amplitude than young adults. Regardless, the older adults who completed a six weeks program of unilateral strength- or coordination-training were able to significantly reduce their tremor amplitude. Although the training-related reductions in tremor amplitude were of a greater magnitude for the trained than untrained limb, a significant reduction in the tremor amplitude of the untrained limb was also observed for the coordination-training group. All of these significant differences/changes in tremor amplitude were associated with significant changes in a number of other dependent variables. For example, the task- and age-related increases in tremor amplitude were primarily a result of greater 8-12 Hz tremor power and were associated with increased EMG activity/co-activation of the extensor digitorum (ED) and flexor digitorum superficialis (FDS) muscles and a significant reduction in intra-limb (index finger-hand and forearm-upper arm) coupling. The significant reductions in tremor amplitude observed for the resistance-trained older adults was a result of a significant decline in 8-12 Hz power and were associated with a significant reduction in ED and FDS co-activation. However, no significant change in intra-limb coupling was observed. The overall trends observed in the results for the finger-pinch force tremor experiments were similar to those for postural tremor. Older adults had significantly more finger-pinch force tremor (i.e. force variability and targeting error) than young adults, although older adults who performed six weeks of unilateral strength-training were able to significantly reduce the force variability and targeting error of the trained limb. No significant training-related reduction in force tremor was however observed for the untrained limb. The significant age-related increase in force tremor was a result of greater low frequency (less than 2 Hz) power and was associated with a significant loss of inter-digit force sharing and coupling as well as tactile sensitivity. Interestingly, the training-related decreases in force tremor were not associated with significant changes in any of the frequency, sharing or coupling measures. Collectively, the results of the five experiments contained in this thesis add much to our understanding of postural and force tremor. Results indicated that numerous task and organism constraints can have a substantial effect on the resulting tremor output. Furthermore, the task- and age-related differences in the power spectral, muscle activity and coupling measures suggested that the changes in tremor output were the result of the use of an altered (sub-optimal) control strategy. The age-related increase in postural and force tremor amplitude may therefore reflect not only an overall decline in neuromuscular system function, but also the relative inability of older adults to effectively coordinate the output of numerous degrees of freedom (limb segments). The effect of the aging process on tremor output was somewhat reversible, with the older adults who performed resistance-training significantly improving their control of both postural and force tremor. There was some evidence that resistance-training could produce cross-education effects in older adults, although these were only statistically significant for postural tremor amplitude in the coordination-training group and for wrist flexion strength in the strength-training group. The relative brevity of the training program (6 weeks) and the observable cross-education effects suggest that the reduction in tremor amplitude and increases in strength were primarily a result of neural adaptations. Such findings further support the prescription of resistance-training for improving physical function in older individuals.
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Keogh, Justin W. L. "Constraints on the Control of Physiological Tremor." Thesis, Griffith University, 2006. http://hdl.handle.net/10072/366057.
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This thesis sought to: 1) examine the effect of a number of organism and task constraints on the control of two forms of physiological tremor, namely postural and finger-pinch force tremor; and 2) determine if the expected constraint-related changes in tremor output were associated with alterations in the control strategy utilised by the performer. The organism constraints were age and resistance-training (for both forms of tremor), while the task constraints were visual feedback, target size and limb preference (postural tremor) and mean force, target shape and limb preference (force tremor). The postural (index finger) tremor amplitude of young adults was significantly greater in the augmented vision (AV) than normal vision (NV) conditions and when using the non-preferred than preferred limb. Even greater differences/changes in postural tremor amplitude were observed as a function of aging and training. Older adults had significantly more index finger tremor amplitude than young adults. Regardless, the older adults who completed a six weeks program of unilateral strength- or coordination-training were able to significantly reduce their tremor amplitude. Although the training-related reductions in tremor amplitude were of a greater magnitude for the trained than untrained limb, a significant reduction in the tremor amplitude of the untrained limb was also observed for the coordination-training group. All of these significant differences/changes in tremor amplitude were associated with significant changes in a number of other dependent variables. For example, the task- and age-related increases in tremor amplitude were primarily a result of greater 8-12 Hz tremor power and were associated with increased EMG activity/co-activation of the extensor digitorum (ED) and flexor digitorum superficialis (FDS) muscles and a significant reduction in intra-limb (index finger-hand and forearm-upper arm) coupling. The significant reductions in tremor amplitude observed for the resistance-trained older adults was a result of a significant decline in 8-12 Hz power and were associated with a significant reduction in ED and FDS co-activation. However, no significant change in intra-limb coupling was observed. The overall trends observed in the results for the finger-pinch force tremor experiments were similar to those for postural tremor. Older adults had significantly more finger-pinch force tremor (i.e. force variability and targeting error) than young adults, although older adults who performed six weeks of unilateral strength-training were able to significantly reduce the force variability and targeting error of the trained limb. No significant training-related reduction in force tremor was however observed for the untrained limb. The significant age-related increase in force tremor was a result of greater low frequency (less than 2 Hz) power and was associated with a significant loss of inter-digit force sharing and coupling as well as tactile sensitivity. Interestingly, the training-related decreases in force tremor were not associated with significant changes in any of the frequency, sharing or coupling measures. Collectively, the results of the five experiments contained in this thesis add much to our understanding of postural and force tremor. Results indicated that numerous task and organism constraints can have a substantial effect on the resulting tremor output. Furthermore, the task- and age-related differences in the power spectral, muscle activity and coupling measures suggested that the changes in tremor output were the result of the use of an altered (sub-optimal) control strategy. The age-related increase in postural and force tremor amplitude may therefore reflect not only an overall decline in neuromuscular system function, but also the relative inability of older adults to effectively coordinate the output of numerous degrees of freedom (limb segments). The effect of the aging process on tremor output was somewhat reversible, with the older adults who performed resistance-training significantly improving their control of both postural and force tremor. There was some evidence that resistance-training could produce cross-education effects in older adults, although these were only statistically significant for postural tremor amplitude in the coordination-training group and for wrist flexion strength in the strength-training group. The relative brevity of the training program (6 weeks) and the observable cross-education effects suggest that the reduction in tremor amplitude and increases in strength were primarily a result of neural adaptations. Such findings further support the prescription of resistance-training for improving physical function in older individuals.Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Physiotherapy and Exercise Science
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Meshack, Rubia Parwyn. "The effects of weights on the amplitude and frequency of postural hand tremor in people with Parkinson's disease." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ63339.pdf.
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Héroux, MARTIN. "The effect of contraction type and intensity, mass loading and visual feedback on wrist tremor in individuals with essential tremor." Thesis, 2008. http://hdl.handle.net/1974/6894.
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Objectives: Determine the effect of contraction type and intensity, inertial loading, and visual feedback on various measures of hand tremor in subjects with essential tremor. Methods: Study 1. Twenty-three ET subjects and 22 controls held their hand in an outstretched position while supporting various submaximal loads (no-load, 5%, 15% and 25% 1-repetition maximum). Hand postural tremor and wrist extensor neuromuscular activity (EMG) were recorded. Study 2. Twenty-one ET subjects and 22 controls applied isometric wrist extension contractions with and without visual feedback. Various submaximal contraction intensities were evaluated (5%, 10%, 20% and 30% MVC). Force production and EMG were recorded. Study 3. Twenty-one ET subjects and 22 healthy controls performed slow wrist extension-flexion movements while supporting various submaximal loads (no-load, 5%, 15% and 25% 1-repetition maximum). Angular displacement and EMG were recorded. Results: Study 1. Inertial loading resulted in a reduction in postural tremor in ET subjects. The largest reduction in tremor amplitude occurred at the 15% load, which was associated with spectral separation of the mechanical reflex and central tremor component. Despite an increase in overall neuromuscular activity with inertial loading, EMG tremor power did not increase with loading. Study 2. Higher contraction intensities were associated with larger amplitude force fluctuations and greater EMG amplitudes. Tremor spectral power of force and EMG remained constant at all target intensities, resulting in a reduction in relative tremor power at higher contraction intensities. Visual feedback affected subjects in the control and ET groups similarly. Study 3. Subjects with more pronounced tremor spectral peaks had larger amplitude kinetic tremor, which was reduced with inertial loading. Despite an increase in overall neuromuscular activity with inertial loading, EMG tremor spectral power was only slightly increased with loading, which resulted in a large reduction in relative EMG tremor power. Conclusions: The effect of inertial loading on postural and kinetic tremor amplitude appears to be mediated in large part by its effect on the interaction between the mechanical reflex and central tremor components. The level of motor unit entrainment remains relatively constant in subjects with ET despite increasing contraction intensities.Thesis (Ph.D, Rehabilitation Science) -- Queen's University, 2008-10-24 11:18:57.537
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Badke, Nicole Jacqueline. "The effects of changing head position and posture on head tremor in individuals with essential tremor involving the head." Thesis, 2011. http://hdl.handle.net/1974/6348.
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Objective: To determine the effects of head position and of different postural control demands on head tremor measures in participants with essential tremor.
Methods: Seventeen participants with essential tremor (ET) of the head and 17 control participants took part. Individuals held their heads in varying degrees of rotation, flexion, and extension. Subsequently, individuals sat and stood in different postures, incorporating different foot placements (feet apart and together), surfaces (solid and foam), and vision conditions (eyes open and closed). Neck muscle activity was recorded from three muscles bilaterally (trapezius, sternocleidomastoid, splenius capitis). Three-dimensional head and thorax positions were recorded using an Optotrak system, and head angular velocity with respect to thorax was calculated by differentiating tilt-twist angles. Fourier analysis was used to determine tremor power.
Results: ET participants showed sharp peaks at their tremor frequency in spectral plots of kinematic data, whereas CN participants did not. Electromyography data was too noisy for frequency analysis. ET participants displayed increased tremor power in head positions 25° from neutral compared to neutral and positions 50° from neutral. Tremor power increased with increasing difficulty of posture for both participant groups. Removal of vision resulted in decreased tremor power in ET participants; power was significantly decreased in the easier postures, and progressively less so with increasing difficulty of posture. Interestingly, tremor direction was inconsistent in both groups, and two ET participants displayed multiple tremor peaks.
Conclusions: The tilt-twist method is a feasible way of measuring head kinematics. Changing stiffness of the neck likely mediates the effect of head position on head tremor power, with the resultant interplay of the central driver and the mechanical resonance driving the amplitude changes. Decreasing stability of posture increases head tremor, likely due to the associated increase in postural sway and stress on the postural control system. Vision appears to exacerbate head tremor through the addition of tremor-related visual noise and an implicit task to stabilize vision; this is possible evidence of a visuomotor deficit. However, stabilizing vision becomes less important with increasing difficulty of posture, resulting in a narrowing gap in tremor power between vision and no vision conditions.Thesis (Master, Rehabilitation Science) -- Queen's University, 2011-03-31 18:16:59.927
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Wu, Pei-Shan, and 吳佩珊. "Loading Effects on Postural and Kinetic Tremors of the Upper Extremity." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/66398977718993297526.
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碩士國立成功大學
物理治療研究所
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Tremor is an involuntary micro-vibration inherent in all human portions, but exaggerated physiological or pathological tremor could be detrimental to a wide spectrum of fine movements during daily life. Despite a long history of tremor research, the key elements and mechanism that change tremors are yet to be explored. Actually, tremor is not only a microvibration but also characteristically affected by intralimb coordination between joints. However, previous researchers did not pay much attention to the interaction among these minute movements, nor realized in depth the meanings of postural and kinetic tremors between Parkinson’s disease (PD) patients and healthy people. Consequently, this study focus on the following issues: 1) how loading effects mediates the characteristics of multi-joint tremors during static postural and kinetic tracking tasks for healthy subjects, and 2) the difference of loading effects on multi-joint tremors between PD patients and age-matched healthy subjects during static postural and kinetic tracking tasks, thus exploring PD patients’ movement difficulties and possible mechanisms on intralimb coordination. Methods: Experiment 1: A set of 16 healthy young people were recruited. Five dual-axis accelerometers were placed on the finger, hand, forearm, upper arm, and C7 of the dominant upper limb. Resting tremors, postural tremors imposed by three weighting loads (0, 50, and 100 grams) on the index, and kinetic tremors while performing index sinusoidal tracing tasks at 0.3 or 0.6 Hz were recorded. Experiment 2: 9 PD patients and 9 age-matched healthy seniors were recruited. Resting tremors, postural tremors imposed with 0 and 100 grams on the index, and kinetic tremors of two weightings (while performing shoulder sinusoidal tracing tasks at 0.3 or 0.6 Hz with 0 and 100 grams on the index). In both weighting and non-weighting conditions, amplitudes, frequency peaks, approximate entropy for postural and kinetic tremor in each limb segment, and cross correlation of tremors in the adjacent limb segments were analyzed. Results: Experiment 1: A frequency peak in range of 6-8 Hz emerged on all limb segments for tracing task. The magnitude of frequency peak in the middle range of tremor spectrum decreased as index loading increased. Loading on the index often raised posture tremor, but reduced kinetic tremor during a tracing task. The fact clearly indicated that tremor characteristics varied with tasks, and intralimb coordination was task dependent for healthy young adults. Experiment 2: For either loading or tracing task, healthy people were capable of skillfully mediating approximate entropy and tremor correlation of neighboring limbs segments for task demands. By contrast, PD patients were lack of adjustment of tremor characteristics in the context of approximate entropy and correlation of limbs segments, but leaded to increment of tremor amplitude on patients’ shoulders, wrists, and finger joints. Besides a frequency peak of 10-12 Hz in postural and kinetic tremors, a new frequency peak of 6-8 Hz also occurred in loading condition for healthy subjects. Meanwhile, frequency peak of postural and kinetic tremors of PD patients (5-7 Hz) was larger than the resting tremor (4-6 Hz). Conclusion: healthy people were able to appropriately change joint stiffness of their upper extremities to minimize tremor when proceeding tracing tasks with or without loading. Nevertheless, PD patients were not able to alter joint stiffness in response to tracing or loading resulting in atypical increase in tremor amplitude. Loading on limb segments could effectively reduce PD kinetic tremors, but conversely enhanced postural tremor. A noticeable emergence of frequency peak in the middle band of tremor spectrum of healthy people was similar to that in postural and kinetic tremors found in the PD patients. It was speculated that the frequency peak was likely e due to the enhancement of long loop stretch reflex.
Books on the topic "Postural tremor"
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de Bie, Robertus M. A. The Stand-Alone Tremor. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780190607555.003.0022.
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Essential tremor is defined as long-standing bilateral hand/arm tremor that is visible and may occur persistently during posture-holding, simple movements, and action. The tremor may be slightly asymmetrical. Other areas of the body that may be affected are head and neck (most frequently), the voice, and legs. Head tremor without limb tremor is accepted as essential tremor, although this definition remains controversial. Essential tremor is a progressive disease and manifests at any age. Tremor in Parkinson’s disease mostly starts unilaterally. A no–no or yes–yes tremor of the head indicates essential tremor, whereas a tremor of the jaw or tongue fits with Parkinson’s disease. The cogwheel phenomenon may also occur in patients with essential tremor. Toxins and medications as the cause for postural/kinetic tremor must be ruled out. Pharmacological options for essential tremor can be unsatisfactory.
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Kaplan, Tamara, and Tracey Milligan. Movement Disorders 1: Tourette’s Syndrome, Essential Tremor, and Parkinson’s Disease (DRAFT). Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780190650261.003.0011.
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The video in this chapter explores movement disorders, and focuses on Tourette’s Syndrome, Essential tremor, and Parkinson’s Disease. It outlines the characteristics of each, such as motor and vocal tics in Tourette’s Syndrome, postural or kinetic tremor in Essential tremor, and the four hallmark features of Parkinson’s Disease (bradykinesia, resting tremor, cogwheel rigidity, and postural instability).
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de Bie, Robertus M. A., and Susanne E. M. Ten Holter. A Tremor with an Abnormal Posture. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780190607555.003.0018.
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Dystonic tremors are a commonly misdiagnosed group of primary tremor disorders, typically mistaken for Parkinson’s disease or essential tremor. Like most movement disorders, this is a clinical diagnosis, so the overlap in some features between all of these disorders can be confusing to less experienced and even more experienced physicians. A tremor in the presence of a dystonia is a dystonic tremor syndrome, regardless of the clinical features. Treatment of dystonic tremor can be challenging without the same gratifying response seen to levodopa in tremor associated with Parkinson’s disease or to beta-blockers and primidone in essential tremor. Deep-brain stimulation remains an option in the most disabling cases.
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Soileau, Michael J., and Kelvin L. Chou. Parkinson Disease. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780199937837.003.0002.
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Parkinson disease is a neurodegenerative disorder characterized clinically by tremor, rigidity, bradykinesia, and postural instability and pathologically by loss of nigrostriatal neurons and deposition of alpha-synuclein in neuronal cell bodies and neuritis. Non-motor symptoms such as psychiatric disorders, cognitive abnormalities, sleep dysfunction, autonomic dysfunction, and sensory manifestations are also common. This chapter gives a broad overview of this disorder. Sections cover pathophysiology, genetics, clinical manifestations, and disease course. The chapter also briefly discusses how to make the diagnosis, and alternative conditions that should be considered.
Book chapters on the topic "Postural tremor"
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Hohler, Anna DePold, and Marcus Ponce de Leon. "Postural Tremor." In Encyclopedia of Clinical Neuropsychology, 1987–88. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-0-387-79948-3_475.
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Daneault, Jean-François, Benoit Carignan, Fariborz Rahimi, Abbas F. Sadikot, and Christian Duval. "Postural Tremors." In Mechanisms and Emerging Therapies in Tremor Disorders, 133–50. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-4027-7_8.
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Bhidayasiri, Roongroj, and Daniel Tarsy. "Parkinsonian Rest, Postural, and Re-emergent Tremor." In Current Clinical Neurology, 50–51. Totowa, NJ: Humana Press, 2012. http://dx.doi.org/10.1007/978-1-60327-426-5_24.
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Lopez, María José Enciso, and Ángel Luis Rodríguez Morales. "Postural Tremor Reduction System Design for Parkinson’s Disease Patients." In IFMBE Proceedings, 1191–99. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-30648-9_155.
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Nashatizadeh, M. M., K. E. Lyons, and R. Pahwa. "Postural Tremor." In Encyclopedia of Movement Disorders, 466–70. Elsevier, 2010. http://dx.doi.org/10.1016/b978-0-12-374105-9.00088-5.
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Morris, John G., and Padraic J. Grattan-Smith. "Postural tremor." In Manual of Neurological Signs. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199945795.003.0054.
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Shibasaki, Hiroshi, Mark Hallett, Kailash P. Bhatia, Stephen G. Reich, and Bettina Balint. "Tremor." In Involuntary Movements, 7–44. Oxford University Press, 2020. http://dx.doi.org/10.1093/med/9780190865047.003.0002.
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Tremor is broadly classified into physiological tremor and pathological tremor. Depending on the clinical features and the predominant pattern of production, tremor is classified into resting tremor, postural tremor, and kinetic tremor. Tremor is associated with rhythmic contraction of agonist and antagonist muscles, either alternately or simultaneously. Tremor involving muscles in the resting condition is called resting tremor and is seen most commonly in Parkinson disease. Tremor involving muscles during isometric contraction is called postural tremor, and it is most commonly seen in essential tremor. Tremor involving muscles during intended movements (isotonic contraction) is called kinetic tremor, and it is most commonly seen in a lesion of the cerebellar efferent pathway.
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Layton, Kelly, Jonathan Riley, Richard Schmidt, Christian Hoelscher, and Chengyuan Wu. "Bilateral Essential Tremor." In Functional Neurosurgery, C1–12. Oxford University PressNew York, 2019. http://dx.doi.org/10.1093/med/9780190887629.003.0001.
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Abstract Essential tremor can be a disabling condition that manifests with postural and action tremors. Hence, patients with essential tremor have difficulty performing basic activities of daily living, including eating and drinking. Though medical therapies such as beta-blockers and primidone may provide some degree of relief for patients, a subset of patients do not experience improvement with medical therapy. Deep brain stimulation targeting the ventralis intermedius nucleus of the thalamus is an effective intervention for essential tremor. Stimulation-induced side effects can include paresthesia from stimulation of the sensory thalamus and motor effects from stimulation of the internal capsule. Evidence supports performing surgery either with patients awake using intraoperative electrophysiological testing or with patients asleep using intraoperative radiological confirmation.
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Dirkx, Michiel F., and Rick C. Helmich. "Parkinson’s Disease and Parkinsonian Tremor." In Tremors, edited by Claudia M. Testa and Dietrich Haubenberger, 153–68. Oxford University PressNew York, 2022. http://dx.doi.org/10.1093/med/9780197529652.003.0012.
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Abstract Tremor is a common symptom of hypokinetic-rigid syndromes such as Parkinson disease. The classical tremor of Parkinson disease is an asymmetric pill-rolling resting tremor of the arms, but postural tremor (including re-emergent and pure postural tremor) and kinetic tremor are also very common. Tremor in atypical parkinsonism is often a symmetric postural tremor that can be jerkier in nature. The pathophysiology of rest tremor in Parkinson disease involves abnormal activity within both the basal ganglia and a cerebello-thalamo-cortical motor circuit, driven by altered dopaminergic, noradrenergic, and serotonergic projections arising from the midbrain. The dopaminergic basis of Parkinson’s tremor differs markedly between individuals and between clinical tremor phenotypes. Dopaminergic treatment (levodopa and dopamine agonists) is the first-choice treatment for rest and re-emergent tremor in Parkinson disease, and probably also rest tremor in atypical parkinsonism. Other pharmacological options include anticholinergics, beta-blockers, or even clozapine, although evidence for these treatment strategies is limited. Additionally, stereotactic surgery including focal lesioning and deep brain stimulation of both basal ganglia (GPi and STN) and thalamus (ventral intermediate nucleus, VIM) are effective treatments for most types of tremor in Parkinson disease.
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Afshari, Mitra, Jill L. Ostrem, Marta San Luciano, and Paul S. Larson. "Rescue Ventral Intermediate Thalamus Deep Brain Stimulation to Address Refractory Tremor Following Subthalamic Nucleus Deep Brain Stimulation With Brittle Dyskinesia." In Deep Brain Stimulation, edited by Laura S. Surillo Dahdah, Padraig O’Suilleabhain, Hrishikesh Dadhich, Mazen Elkurd, Shilpa Chitnis, and Richard B. Dewey, 115–18. Oxford University Press, 2020. http://dx.doi.org/10.1093/med/9780190647209.003.0023.
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This chapter discusses a case in which a “rescue” deep brain stimulation (DBS) lead was implanted to address suboptimal tremor control. The patient was a 52-year-old woman with disabling bilateral postural and action hand tremor who also had mild parkinsonian signs. An essential tremor (ET)–Parkinson disease (PD) syndrome was suspected, and subthalamic nucleus (STN) DBS was pursued. Attempts at optimizing tremor control by reprogramming were limited by the induction of brittle dyskinesia even with small amounts of stimulation. Bilateral ventral intermediate thalamus DBS leads were then implanted, and the tremors improved significantly. Troubleshooting strategies for optimizing tremor control and reducing STN DBS–induced brittle dyskinesia are discussed. The chapter reviews important learning points on DBS target selection for ET, PD, and ET-PD spectrum syndromes.
Conference papers on the topic "Postural tremor"
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Zhu, Na, and Nathaniel S. Miller. "Assessment of Parkinson’s Disease Tremor and Correlation Analysis With Applied Signal Processing." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10622.
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Abstract Accurate measurement and assessment of Parkinson’s disease (PD) tremor is important for patients, clinicians, and researchers to track changes in disease progression and the effectiveness of therapeutic interventions. This study measured resting, postural, and kinetic tremor from patient’s most-affected hand with accelerometers and gyrometers, thus the linear and rotational motions in the x, y, z directions were obtained. Data were collected when patients were both ON and OFF their anti-PD medications. A bandpass filter was applied to extract raw tremor information and several signal processing algorithms were used to analyze the data in both time and frequency domains, including the correlations between motions at different directions. The results of medication effectiveness on PD tremor and the correlational analyses will be discussed.
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Shukla, Amit, Ashutosh Mani, Amit Bhattacharya, and Fredy Revilla. "Classification of Postural Response in Parkinson’s Patients Using Support Vector Machines." In ASME 2013 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/dscc2013-3888.
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Parkinson’s disease (PD) is a neurodegenerative condition with neuronal cell death in the substantia nigra and striatal dopamine deficiency that produces slowness, stiffness, tremor, shuffling gait and postural instability. More than 1 million people in North America are affected by PD resulting in balance problems and falls. It is observed that postural instability and gait problems become resistant to pharmacologic therapy as the disease progresses. Furthermore, studies suggest that postural sway abnormalities are worsened by levodopa, the mainstay of therapy for PD. This paper presents a classification of postural balance test data using Support Vector Machines (SVM) to identify the effect of medicine (levodopa) as well as dyskinesia. It is demonstrated that SVM is a useful tool and can complement the widely accepted (but very resource intensive) Unified Parkinson’s Disease Rating Scale (UPDRS).
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Demer, Joseph L., Franklin I. Porter, Jefim Goldberg, Herman A. Jenkins, and Kim Schmidt. "The Effect of Telescopic Spectacles on Visual Acuity During Head Motion." In Noninvasive Assessment of the Visual System. Washington, D.C.: Optica Publishing Group, 1987. http://dx.doi.org/10.1364/navs.1987.wa1.
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Telescopic spectacles are commonly prescribed to the visually impaired. However, many such low vision patients cannot use spectacle magnifiers effectively. This may be because these patients cannot maintain adequate stability of the magnified image on the retina during head movements. Head movements are the ubiquitous consequence of ambulation, tremor, and postural instability.
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Ly, Khoi, Aimee Cloutier, and James Yang. "Quantitative Motor Assessment, Detection, and Suppression of Parkinson’s Disease Hand Tremor: A Literature Review." In ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-59095.
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Parkinson’s disease (PD) is difficult to detect before the onset of symptoms; further, PD symptoms share characteristics with symptoms of other diseases, making diagnosis of PD a challenging task. Without proper diagnosis and treatment, PD symptoms including tremor, bradykinesia, and cognitive problems deteriorate quickly into patients’ late life. Among them, the most distinguishable manifestations of PD are rest and postural tremor. Tremor is defined as an involuntary shaking or quivering movement of the hands or feet. Unified Parkinson’s Disease Rating Scale (UPDRS), Hoehn and Yahr (H&Y) scales are the most common rating scales that quantify the severity of PD. Due to the lack of consistency in these diagnostic tests, researchers are looking for devices for quantification and detection that can provide more objective PD motor assessments. Additionally, since there is currently no cure for PD, temporary PD symptom suppression is an active research area for improving patients’ quality of life. In this survey, the current state of research on Parkinson’s disease hand tremor quantification, detection, and suppression is discussed, especially focusing on electromechanical devices. The future direction of research on these devices is also considered.
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Shukla, P., I. Basu, D. Graupe, D. Tuninetti, K. V. Slavin, L. Verhagen Metman, and D. M. Corcos. "A decision tree classifier for postural and movement conditions in Essential Tremor patients." In 2013 6th International IEEE/EMBS Conference on Neural Engineering (NER). IEEE, 2013. http://dx.doi.org/10.1109/ner.2013.6695885.
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Rocha, Bruna Alves, Lucas Oliveira Braga, Julia Beatriz Xavier do Nascimento, and Angela dos Santos Avakian. "Deep brain stimulation in the treatment of Parkinson’s disease." In XIII Congresso Paulista de Neurologia. Zeppelini Editorial e Comunicação, 2021. http://dx.doi.org/10.5327/1516-3180.444.
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Introduction: Parkinson’s disease (PD) is neurodegenerative and has bradykinesia, rest tremor, stiffnes and postural instability. These changes come from the degeneration of dopaminergic neurons. The treatment, carried out based on levodopa, provides improvements in the condition of the patients, however, they provide side effects. Based on this, the Deep Brain Stimulation (DBS) technique - stimulation of subcortical structures with electrodes - is a good treatment option. Methods: A narrative review of the literature was carried out, using the PubMed database with the keywords “Deep brain stimulation”, “Therapeutic use” and “Parkinson’s disease”. Included articles of meta-analysis, systematic review and review published in the last year. Results: The DBS offers a significant improvement in motor symptoms, gait, postural instability, reduction in tremors and in their progression. However, DBS can offer risks to the patient. Comparing the effectiveness of DBS with other therapies for Parkinson’s, such as levodopa/ carbidopa intestinal infusion gel (LCIG) and best medical therapy (BMT), it was found that BMT is botton. The cost-effectiveness comparison of these techniques, showed that DBS is the most costly procedure. It stands out comparisons can have intrinsic biases, such as the conflict of interest with pharmaceutical companies. Conclusion: DBS is a beneficial intervention for patients with PD who have important motor symptoms. Performed only in cases with indication, due to the possibility of complications.
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Zhu, Linda, Nathaniel S. Miller, Charlotte Tang, Sriram Pendyala, Quinn Hanses, and Lacie Gladding. "Reliability Check of an Assessment System for Parkinson’s Disease Tremor Monitoring With Portable Devices." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-71144.
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Abstract Tremor, or an involuntary and oscillatory movement of a body part, is a cardinal symptom of Parkinson’s disease (PD) that can significantly impact activities of daily living in people with PD (PwPD). Although tremor can be mitigated with anti-PD medications, medication effectiveness is mixed for PwPD. Therefore, daily monitoring and assessment of tremor are of interest to PwPD, clinicians, and researchers. While several sensors and wearable devices have been developed and introduced to the consumer market, high costs limit their accessibility. The current research is two-fold. First, an assessment system based on multiple algorithms is developed for evaluating the reliability of measurements of PD symptoms: hand tremor and finger/hand movement speed. Second, an Android mobile application was designed and developed to capture finger-tapping frequencies and measurements of several PD symptoms like hand tremor. A healthy young adult participant produced a self-generated tremor for this study. The participant held the portable device and conducted self-measurements by following in-app instructions. Resting tremor was measured while the participant rested his upper extremity on the arm of a chair, postural tremor was measured while he maintained a position against gravity, and kinetic tremor was measured during a movement task. Data collection took approximately fifteen minutes. The linear and rotational motions, respectively, were collected by accelerometers and gyroscopes embedded within the mobile device. The results were captured and delivered to a cloud database. An assessment system with multiple algorithms provided a final evaluation of the participant’s tremor. The process included three parts. First, calculation of root-mean-square (RMS) values at all linear and rotational directions was conducted to provide tremor strength. Second, fast Fourier transform (FFT) extracted the peak frequency at each direction. The powers of peaks were compared and the highest peak was defined as the dominant frequency and that frequency’s corresponding direction of motion. Third, hand and motion correlation analysis was used to find any coherence of tremor on 3-D motions. To test the reliability of motion measurement, the same motion input was applied to multiple devices simultaneously. The outputs of different types of mobile devices were evaluated, while considering various factors and models of mobile devices in the market (i.e., device size, weight, operating system, sampling frequency, and accuracy during the measurement). Multiple trials were conducted to test the reliability of the assessment system and the performance of the mobile app. Additionally, the mobile application supports finger tapping tests that measure hand movement speed, which is commonly impaired in PwPD. Both tremor and movement speed measurements can be used to evaluate disease progression over time and could support focused medication adjustments based on symptom data.
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Grimaldi, Giuliana, Lammertse Piet, and Mario Manto. "Effects of wrist oscillations on contralateral neurological postural tremor using a new myohaptic device ('wristalyzer')." In 2007 4th IEEE/EMBS International Summer School and Symposium on Medical Devices and Biosensors. IEEE, 2007. http://dx.doi.org/10.1109/issmdbs.2007.4338288.
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Biswas, Sonali, and Anup Kumar Gogoi. "Design and analysis of FEM based MEMS accelerometer for detection of postural tremor in Thyrotoxicosis." In 2013 International Conference on Advanced Electronic Systems (ICAES). IEEE, 2013. http://dx.doi.org/10.1109/icaes.2013.6659372.
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Thelen, Matthew, Fardeen Mazumder, Linda Zhu, Charlotte Tang, and Nathaniel S. Miller. "Reliability Test of Mobile Embedded Accelerometers in Measuring Postural Stability for People With Parkinson’s Disease." In ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-94806.
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Abstract Parkinson’s Disease (PD) is the second most common neurodegenerative disease in the United States, affecting at least one million people. The cardinal symptoms of PD are tremor, rigidity, slowed movement, and impaired balance. While some symptoms of PD are responsive to anti-PD medications, other symptoms, are less medication responsive, especially walking and balance. Moreover, daily activities, such as writing, using tools, and walking, affect the quality of life (QoL) of people with PD (PwPD). Monitoring PD symptoms is essential for clinical evaluations and adjusting medication to help maintain QoL for PwPD. we are developing a mobile app to conduct at-home PD symptom monitoring with the goal of providing more timely and frequent measurements of PD symptoms for both patients and clinicians. While the tremor and finger tapping results collected in the mobile app have been discussed in previous publications, this paper focuses on the design and testing of postural stability (balance) tests in the app and the validation of the reliability of the mobile embedded accelerometers. During the test, a dual-purpose shaker was employed to provide vibration in amplitude and frequency range similar to human postural stability signals. A head expander was attached to the shaker and the smartphone holder is screwed to it. The tilt and yaw angles of the smartphone holder are adjustable, therefore the smartphone could be tested in an angled position relative to the shaker. Various types of input signals were tested, including sweep and multiple real postural stability data previously collected from a volunteer. Two models of smartphones were used to measure the signal through multiple trials and the results were compared to the input benchmark signal to verify the accuracy of the smartphone measurements. Besides the evaluation of the time domain raw data, we have also employed several signal processing algorithms to extract postural stability factors, such as the root mean square (RMS) value, the derivative of acceleration, frequency factors, etc., with the goal of identifying the patterns of motion signals which could be used as a summary measures of balance for PD. These signal processing algorithms were used to process raw measurement data from multiple trials, on different input signals, and on different devices. The results were compared, and the consistency of these factors through multiple trials with different smartphone models is tested and summarized. These results help us to find the most reliable measure to be used in the smartphone application. Both the results in raw acceleration signals and calculated factors will be discussed to further the current understanding of the reliability of smartphone measurements with embedded accelerometers.
Reports on the topic "Postural tremor"
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Wang, Xiao, Hong Shen, Yujie Liang, Yixin Wang, Meiqi Zhang, and Hongtao Ma. Effectiveness of Tango Intervention on Motor Symptoms in Patients with Parkinson's Disease: A Protocol for Systematic Review and Meta-Analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, May 2022. http://dx.doi.org/10.37766/inplasy2022.5.0009.
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Review question / Objective: Parkinson's disease (PD) is a degenerative neurological disease caused by the loss of dopaminergic neurons in the pars compacta of the substantia nigra of the brain, resulting in lesions in the basal ganglia. The main motor symptoms of PD include resting tremor, rigidity, akinesia or bradykinesia and postural instability. As an exercise intervention based on musical accompaniment, tango dance has shown positive effects on the rehabilitation of motor symptoms in PD patients in recently. In this study, we systematically reviewed the efficacy of tango intervention in alleviating the motor symptoms of patients with PD. Condition being studied: Parkinson. Information sources: The following electronic databases will be searched: PubMed, Cochrane Central Register of Controlled Trials (CENTRAL), Web of Science Core collection, and China National Knowledge Infrastructure Database (CNKI) and WanFang Database.
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Ni, Jiachun, Qiong Jiang, Gang Mao, Yi Yang, Qin Wei, Changcheng Hou, Xiangdong Yang, Wenbin Fan, and Zengjin Cai. The effectiveness and safety of acupuncture for constipation associated with Parkinson’s disease: Protocol for a systematic review and meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, February 2022. http://dx.doi.org/10.37766/inplasy2022.2.0091.
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Review question / Objective: Is acupuncture a safe and effective therapy for constipation associated with Parkinson’s disease? Our aim is to assess the effectiveness and safety of acupuncture for constipation associated with PD and give guidance to future research direction. Condition being studied: Parkinson’s disease (PD) is a prevalent degenerative disease of nervous system characterized mainly by static tremor, bradykinesia, myotonia, postural gait disorders and other non-motor symptoms. According to variations on race, ethnicity, age and sex, the incidence of PD ranges from 8 to 20.5 per 100, 000 individuals annually. One global research shows that there were 6.1 million individuals suffer from PD in 2016 and will be 12 million patients around the world. According to several outcomes of case-control studies, the prevalence of constipation in PD varies from 28% to 61%. Constipation, as a common gastrointestinal disease which refers to the clinical presentation of reduced spontaneous complete bowel movement, dyschezia, feeling of incomplete defecation and outlet obstruction, is demonstrated to antedate the motor symptom and it's severity is related to the progression of PD. Acupuncture has been proved to act on the pathogenesis of constipation associated with PD. The proposed systematic review we're about to present is the first advanced evidence-based medical evidence in this area.