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Modulation of the rate of force development in hip abductor muscles by neuromuscular electrical stimulation during gait
Authors:Kazuya Takeda  Soichiro Koyama  Koji Shomoto  Kosuke Ushiroyama  Yuki Naoi  Hiroaki Sakurai
Affiliation:1. Department of Rehabilitation, Kawamura Hospital, Gifu, Japan;2. Faculty of Rehabilitation, School of Health Sciences, Fujita Health University, Toyoake, Japan;3. Department of Physical Therapy, Faculty of Health Science, Kio University, Nara, Japan
Abstract:
Abstract

Purpose/aim of the study: An increase of hip abductor muscle strength contributes to the increase in gait speed. It is known that the rate of force development (RFD), an indicator of muscle strength, is increased by the combined use of low-intensity neuromuscular electrical stimulation (NMES) to the glutaeus medius (GM) and low-load resistance training (RT). However, it is unclear whether low-intensity neuromuscular electrical stimulation of the glutaeus medius during walking also increases the rate of force development. The aim of this study was to clarify whether NMES to the GM during gait modulates the RFD of the hip abductor muscles in healthy adults.

Materials and methods: Twenty-two healthy adults randomly received both gait with sub-motor threshold NMES and gait with sham NMES conditions. The RFD was assessed at pre- and post-intervention. A two-way repeated measures analysis of variance was used to analyse the effects of time and intervention.

Results: Gait with sub-motor threshold NMES condition significantly increased the RFD in shorter time interval (0–50 and 0–100?ms) compared to gait with sham NMES condition.

Conclusions: These findings suggest that the adding low-intensity NMES of the GM to gait is effective in increasing the RFD of the hip abductor muscles.
Keywords:Rate of force development  neuromuscular electrical stimulation  gait  hip abductor muscles
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