Effects of Wrist Weights on Kinematic and Myographic Movement Characteristics During a Reaching Task in Individuals With Parkinson Disease

  • Kuan-yi Li
    Affiliations
    Department of Occupational Therapy and Graduate Institute of Behavioral Sciences, Chang Gung University, Tao-yuan, Taiwan

    Healthy Aging Research Center, Chang Gung University, Taoyuan, Taiwan

    Movement Disorders Section, Department of Neurology, Chang Gung Memorial Hospital, Linkou, Taiwan
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  • Yu-pei Hsiao
    Affiliations
    Department of Rehabilitation and Treatment, Lotung Poh-Ai Hospital, Yilan, Taiwan
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  • Rou-shayn Chen
    Affiliations
    Movement Disorders Section, Department of Neurology, Chang Gung Memorial Hospital, Linkou, Taiwan
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  • Ching-yi Wu
    Correspondence
    Corresponding author Ching-yi Wu, ScD, OTR, Department of Occupational Therapy and Graduate Institute of Behavioral Sciences, and Healthy Aging Research Center, Chang Gung University, 259 Wen-hwa 1st Rd, Kwei-shan, Tao-yuan, Taiwan 333.
    Affiliations
    Department of Occupational Therapy and Graduate Institute of Behavioral Sciences, Chang Gung University, Tao-yuan, Taiwan

    Healthy Aging Research Center, Chang Gung University, Taoyuan, Taiwan

    Department of Rehabilitation, Chang Gung Memorial Hospital, Taoyuan, Taiwan
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Published:December 21, 2017DOI:https://doi.org/10.1016/j.apmr.2017.11.009

      Abstract

      Objective

      To investigate the kinematic and myographic effects of weighted wrist cuffs on individuals with Parkinson disease (PD) during a reaching task.

      Design

      Cross-sectional study.

      Setting

      Biomechanics research laboratory.

      Participants

      Individuals (N=39) with PD (n=19) and healthy age-matched control subjects (n=20).

      Interventions

      Participants were instructed to reach and grasp a can at a distance of 80% of their arm length without a wrist cuff, while wearing separate 0.5- and 1.0-kg wrist cuffs, and subsequently without a wrist cuff.

      Main Outcome Measures

      Movement time, kinematic, and electromyographic data were recorded during all reach and grasp movements. Four end point coordinate strategy variables, 3 joint recruitment variables, and 2 co-contraction indices were derived from the raw data for analysis.

      Results

      Significant interaction effects were found in the trunk and index finger movement time as the weight of the cuff increased from 0.5 to 1.0kg. The group of individuals with PD showed decreased movement times in both instances, whereas the control group showed increased movement times as the weight of the wrist cuff increased from baseline to 0.5 and 1.0kg. No group difference was observed in the co-contraction index of the upper arm and forearm.

      Conclusions

      Adoption of weighted wrist cuffs in the clinic should be cautiously undertaken because compensatory movements may be induced in the trunk of individuals with PD.

      Keyword

      List of abbreviations:

      MMSE ( Mini-Mental State Examination), MT ( movement time), PD ( Parkinson disease), PV ( peak velocity)
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