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Gait Termination Control Strategies Are Altered in Chronic Ankle Instability Subjects

MEDICINE AND SCIENCE IN SPORTS AND EXERCISE (2010)

期刊

MEDICINE AND SCIENCE IN SPORTS AND EXERCISE

卷 42, 期 1, 页码 197-205

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LIPPINCOTT WILLIAMS & WILKINS

DOI: 10.1249/MSS.0b013e3181ad1e2f

关键词

EMG; KINETICS; STOPPING; DYNAMIC POSTURAL CONTROL

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Sport Sciences

资金

Southeastern Athletic Trainers' Association Grant Award Program

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WIKSTROM, E. A., M. D. BISHOP, A. D. INAMDAR, and C. J. HASS. Gait Termination Control Strategies Are Altered in Chronic Ankle Instability Subjects. Med. Sci. Sports Exerc., Vol. 42, No. 1, pp. 197-205, 2010. Despite the high incidence of chronic ankle instability (CAI), the underlying neurophysiologic mechanism is unknown. Evidence Suggests that both feed-forward and feedback mechanisms may play a role. However, no investigation has examined both control mechanism,,, during the same movement task in the same cohort of CAI patients. Purpose: To determine the neuromuscular and biomechanical control alterations present in CAI patients during planned (Feed-forward) and unplanned (feedback) gait termination. Methods: Twenty subjects with CA1 and 20 uninjured completed planned and unplanned gait termination protocols. Both tasks began with subjects walking at a self-selected speed across a 12-m walkway. Unplanned gait termination required subjects to stop during randomly selected trials on two adjacent force plates when cued. Planned gait termination required purposeful stopping on the force places. Propulsive and braking force magnitude and the dynamic postural stability index were calculated from the resulting ground reaction forces. In addition, muscle activity from the soleus, tibialis anterior, and gluteus medius was collected bilaterally. Results: Both maximum propulsive (CA1 = 99.8 +/- 40.8 N, control = 88.6 +/- 33.6 N) and braking (CAI = 207.1 +/- 80.9 N, control = 161.6 +/- 62.2 N) forces were significantly higher in the CAI group. The dynamic Postural stability index revealed higher scores in the CAI group (0.24 +/- 0.03) compared with the control group (0.22 0.03). Muscle activation of the soleus and tibialis anterior differed during unplanned and planned gait termination between groups (P < 0.05) and between the limbs of the CA1 group (P < 0.05). Conclusions: Altered biomechanical strategies during both planned and unplanned gait termination indicate that patients with CA1 have alterations in feed-forward neuromuscular control and Suggest the presence of feedback neuromuscular control deficits,

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Effects of different initial foot positions on kinematics, muscle activation patterns, and postural control during a sit-to-stand in younger and older adults

Woohyoung Jeon, Hao-Yuan Hsiao, Lisa Griffin

Summary: The study investigated the effects of different initial foot positions on kinematics, muscle activation patterns, and balance control during a sit-to-stand task in younger and older adults. The toes-out foot position led to smaller trunk flexion angles and greater activation of hip muscles, contributing to improved postural stability during the task. This suggests that training with a toes-out foot position could be an effective rehabilitation strategy for older adults to strengthen hip muscles and improve balance control during a sit-to-stand task.

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