Muscle Activity during Postural Stability Tasks: Role of Military Footwear and Load Carriage

Decrements to postural control manifest as an increase in muscle activity, indicating continuous attempts to maintain body equilibrium and postural stability. Extrinsic factors such as footwear, and intrinsic factors such as muscle fatigue, can affect postural stability. The purpose of this study wa...

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Bibliographic Details
Published in:Safety (Basel) 2020-09, Vol.6 (3), p.35
Main Authors: Kodithuwakku Arachchige, Sachini N.K., Chander, Harish, Turner, Alana J., Wilson, Samuel J., Simpson, Jeffrey D., Knight, Adam C., Burch V., Reuben F., Wade, Chip, Garner, John C., Carruth, Daniel
Format: Article
Language:English
Subjects:
Electromyography
Fatigue
Footwear
military footwear
Military personnel
motor control test
Muscle function
Physiology
postural stability
Posture
sensory organization test
Shoes & boots
Workloads
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Summary:Decrements to postural control manifest as an increase in muscle activity, indicating continuous attempts to maintain body equilibrium and postural stability. Extrinsic factors such as footwear, and intrinsic factors such as muscle fatigue, can affect postural stability. The purpose of this study was to analyze the impact of two types of military footwear and a military-type load-carrying task on lower extremity muscle activity during various postural stability tasks. Sixteen males’ (age: 26.63 ± 3.93 years; mass: 87 ± 12.4 kg; height: 178.04 ± 6.2 cm) muscle activity from knee flexors, extensors, ankle dorsiflexors, and plantar flexors were measured using electromyography in standard (STD) and minimalist (MIN) military footwear, before (PRE) and after (POST) a simulated workload during sensory organization and motor control tests on the Neurocom EquitestTM. Mean muscle activity was analyzed using 2 (footwear) × 2 (time) repeated measures ANOVA with an alpha level of 0.05. Results revealed a requirement of significantly greater muscle activity in POST and STD. MIN demonstrated lesser balance decrements POST workload, which could be attributed to its design characteristics. Results will help in suggesting footwear design characteristics to minimize muscular exertion while eliciting better postural control, and to prevent postural instability due to overexertion in military personnel.
ISSN:2313-576X
2313-576X
DOI:10.3390/safety6030035