Muscle-Activation Onset Times With Shoes and Foot Orthoses in Participants With Chronic Ankle Instability

作者：Dingenen Bart^*; Peeraer Louis; Deschamps Kevin; Fieuws Steffen; Janssens Luc; Staes Filip

来源：Journal of Athletic Training, 2015, 50(7): 688-696.

DOI：10.4085/1062-6050-50.2.02

• footwear
• insoles
• ankle sprains
• neuromuscular system
• electromyography

Context: Participants with chronic ankle instability (CAI) use an altered neuromuscular strategy to shift weight from double-legged to single-legged stance. Shoes and foot orthoses may influence these muscle-activation patterns.
Objective: To evaluate the influence of shoes and foot orthoses on onset times of lower extremity muscle activity in participants with CAI during the transition from double-legged to single-legged stance.
Design: Cross-sectional study.
Setting: Musculoskeletal laboratory.
Patients or Other Participants: A total of 15 people (9 men, 6 women; age = 21.8 +/- 3.0 years, height = 177.7 +/- 9.6 cm, mass = 72.0 +/- 14.6 kg) who had CAI and wore foot orthoses were recruited.
Intervention(s): A transition task from double-legged to single-legged stance was performed with eyes open and with eyes closed. Both limbs were tested in 4 experimental conditions: (1) barefoot (BF), (2) shoes only, (3) shoes with standard foot orthoses, and (4) shoes with custom foot orthoses (SCFO).
Main Outcome Measure(s): The onset of activity of 9 lower extremity muscles was recorded using surface electromyography and a single force plate.
Results: Based on a full-factorial (condition, region, limb, vision) linear model for repeated measures, we found a condition effect (F-3,F-91.8 = 9.39, P < .001). Differences among experimental conditions did not depend on limb or vision condition. Based on a 2-way (condition, muscle) linear model within each region (ankle, knee, hip), earlier muscle-activation onset times were observed in the SCFO than in the BF condition for the peroneus longus (P < .001), tibialis anterior (P = .003), vastus medialis obliquus (P = .04), and vastus lateralis (P = .005). Furthermore, the peroneus longus was activated earlier in the shoes-only (P = .02) and shoes-with-standard-foot-orthoses (P = .03) conditions than in the BF condition. No differences were observed for the hip muscles.
Conclusions: Earlier onset of muscle activity was most apparent in the SCFO condition for ankle and knee muscles but not for hip muscles during the transition from double-legged to single-legged stance. These findings might help clinicians understand how shoes and foot orthoses can influence neuromuscular control in participants with CAI.

• 出版日期2015-7