THE EFFECT OF UNILATERAL ANKLE MUSCLE FATIGUE ON POSTURAL CONTROL IN OLDER ADULTS
The aim of this study was to investigate the effect of unilateral ankle fatigue on postural control in older adults. Fourteen older adults (male = 7, female = 7) volunteered to participate in this study. Subjects (aged 65 ± 4 years) were asked to perform perturbation tests; bipedal standing followed by 15 repetitions of rapid arm raising, during pre-fatigue and post-fatigue conditions. Ankle fatigue was induced in dominant leg by preforming repetitive dorsi-and plantar-flexion exercise (120°/s) and terminated when maximum voluntary isometric contraction (MVIC) decreased to 50%. To evaluate postural control, center pressure (COP) excursion and center of mass (COM) displacement were recorded during the perturbation using 10 cameras motion capture (BTS DX 5000, BTS Bioengineering, Italy) and force platform (Kistler Instrument AG, Switzerland). Results showed that COP excursion and COM displacement in anterior posterior direction were significantly increased (p<0.05) after ankle fatigue (COP: Pre- vs. Post fatigue = 20.0 ± 6.4 vs. 22.2 ± 6.6); (COM: Pre- vs. Post fatigue = 7.8 ± 1.6 vs. 8.8 ± 1.5). However, no significant changes of COP and COM was observed in medial-lateral direction. It can be concluded that postural control capability during perturbation in older adults was compromised by acute unilateral ankle muscle fatigue.
(Journal of Sports Science and Technology 2019; 19(1): 49-57)
(Received: 1 May 2019, Revised: 12 June 2019, Accepted: 13 June 2019)
Keywords: Postural control / Muscle fatigue / Older adults / Center of pressure / Center of mass.
*Corresponding author: Metta PINTHONG, PhD
College of Sports Science and Technology, Mahidol University,
Salaya campus, Phuttamonton, Nakhonpathom, Thailand, 73170
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