Journal article
Effect of 12 weeks of Tai Chi training on soleus Hoffmann reflex and control of static posture in older adults
Archives of Physical Medicine and Rehabilitation, Vol.92(6), pp.886-891
2011
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Abstract
<p><h4 id="x-x-absSec_N1cf09400N541a7ba0">Objective</h4> <p id="x-x-sp0040">To investigate the effect of 12 weeks of Tai Chi training on soleus (SOL) Hoffmann reflex (H-reflex) modulation and postural control in standing under 4 sensory conditions in older adults. <h4 id="x-x-absSec_N1cf09400N541a7c00">Design</h4> <p id="x-x-sp0045">Experimental research design with pre- and posttraining tests in a training group and a control group. <h4 id="x-x-absSec_N1cf09400N541a7c60">Setting</h4> <p id="x-x-sp0050">University biomechanics laboratory. <h4 id="x-x-absSec_N1cf09400N541a7cc0">Participants</h4> <p id="x-x-sp0055">Community-dwelling older adults (N=34) were assigned to a training (n=20; mean ± SD age, 72.9±4.4y) and a control (n=14; mean ± SD age, 72.9±6.5y) group. <h4 id="x-x-absSec_N1cf09400N541a7d20">Intervention</h4> <p id="x-x-sp0060">Tai Chi participants attended a 1-hour session of Yang style Tai Chi, 3 sessions a week, for 12 weeks, while control participants maintained their regular daily activities during the same period. <h4 id="x-x-absSec_N1cf09400N541a7d80">Main Outcome Measures</h4> <p id="x-x-sp0065">SOL H-reflex (maximal amplitudes of H-reflex [H<sub>max</sub>] and M-wave [M<sub>max</sub>] waves) and mean displacement of the center of pressure (COP) in the anterior-posterior (COP<sub>A-P</sub>) and medial-lateral (COP<sub>M-L</sub>) directions were measured during bipedal standing, with the feet placed on a forceplate and the heels 6cm apart, under 4 sensory conditions: stable surface with eyes open, stable surface with eyes closed, unstable surface with eyes open, and unstable surface with eyes closed. <h4 id="x-x-absSec_N1cf09400N541a7de0">Results</h4> <p id="x-x-sp0070">SOL H<sub>max</sub>/M<sub>max</sub> ratio in the Tai Chi group was upregulated significantly in all 4 sensory tasks after the 12-week Tai Chi training (<em>P</em><.05). No significant change in COP measurements (mean displacement of COP<sub>A-P</sub> and COP<sub>M-L</sub>) was found in either the Tai Chi or control group after the 12-week period. <h4 id="x-x-absSec_N1cf09400N541a7e70">Conclusions</h4> <p id="x-x-sp0075">An increase in SOL H<sub>max</sub>/M<sub>max</sub> ratio during static postural tasks is observed after 12 weeks of Tai Chi training in older adults under all 4 sensory conditions. However, training-induced changes in H-reflex were not accompanied by improvement of performance in the static postural control tasks.</p>
Details
- Title
- Effect of 12 weeks of Tai Chi training on soleus Hoffmann reflex and control of static posture in older adults
- Creators
- Colleen M Cartwright - Southern Cross UniversityYungsheng Chen - Southern Cross UniversityShi Zhou - Southern Cross University
- Publication Details
- Archives of Physical Medicine and Rehabilitation, Vol.92(6), pp.886-891
- Identifiers
- 2004; 991012822122202368
- Academic Unit
- Faculty of Health; School of Health and Human Sciences; Office of the Vice Chancellor; Office of Deputy Vice Chancellor, Research; Human Sciences
- Resource Type
- Journal article