Muscle activation characteristics associated with differences in physiological tremor amplitude between the dominant and non-dominant hand |
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| Authors: | Martin Bilodeau Étienne Bisson Danie DeGrâce Isabelle Després Melissa Johnson |
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| Institution: | 1. Élisabeth Bruyère Research Institute, SCO Health Service, Ottawa, Ontario, Canada K1N 5C8;2. School or Rehabilitation Sciences, Faculty of Health Sciences, University of Ottawa, Ottawa, Ontario, Canada K1H 8M5;9. Shanghai Pudong New Area Zhoupu Hospital, Department of Neurology, Shanghai, China.;99. Shanghai Jiaotong University Affiliated Sixth People''s Hospital, Department of Neurology, Shanghai, China.;999. Center of Gumei Community, Minhang District, Shanghai, China.;9V. Fudan University Affiliated Fifthth People''s Hospital, Department of Neurology, Shanghai, China.;1. University of Michigan Medical School, Ann Arbor, MI, USA;2. Department of Surgery, University of Michigan Health System, Ann Arbor, MI, USA;3. Harvard University Extension School, Cambridge, MA, USA;1. Department of Neurology, Medical University of Vienna, Währinger Gürtel 18-20, A-1090 Vienna, Austria;2. Clinical Trials Unit, Office of the Clinical Director, NINDS Intramural Research Program, National Institutes of Health, 9000 Rockville Pike, Bldg 10, Rm 6-5700, Bethesda 20892, MD, USA |
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| Abstract: | The aim of this study was to assess differences in physiological tremor amplitude of the hand between the dominant and non-dominant side of right-handed individuals. Mechanical loading of the hand and frequency analysis were used in an attempt to identify the physiological mechanisms involved in observed differences. Seventeen healthy right-handed adults participated in a single session where physiological tremor of the outstretched left and right hands was recorded under different loading conditions (0 g up to 5614 g). Physiological tremor amplitude was quantified through accelerometry and electromyographic (EMG) signals of wrist extensor and flexor muscles were also recorded. The main findings were: ～30% greater amplitude of fluctuations in acceleration for the non-dominant compared with the dominant hand, no difference in the frequency content of acceleration or demodulated EMG signals between dominant and non-dominant sides across all loads, and condition-dependent associations between the amplitude of fluctuations in acceleration and EMG amplitude and frequency content. These associations suggest a potential role of central modulation of neural activity to explain dominance-related differences in physiological tremor amplitude of the hand. |
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