The effect of foot orthotics on myoelectric fatigue in the vastus lateralis during a simulated skier's squat

Vanicek, Natalie; Kingman, Joanna; Hencken, Clare

Abstract

Fatigue in the legs is a problem experienced by skiers. It has been suggested that optimal orthotics may reduce muscle fatigue for a given movement task by minimising muscle activity (Med. Sci. Sports Exerc. 31 (1999) S421). The aims were to determine whether EMG would provide an independent method of analysing myoelectric fatigue in the vastus lateralis (VL) during a skier's squat and whether orthotics could affect this fatigue response. Six skiers performed skier's squats for as long as possible with no orthotic, low volume orthotics and high volume orthotics in their ski boots. Bipolar, active surface electrodes recorded EMG activity in the VL throughout each squat. Results for the EMG median frequency showed a significant shift in the power density spectrum towards the lower frequencies (P0.05). Subjective and objective findings support the use of the high volume foot orthotic for skiers. © 2004 Elsevier Ltd. All rights reserved.

Citation

Vanicek, N., Kingman, J., & Hencken, C. (2004). The effect of foot orthotics on myoelectric fatigue in the vastus lateralis during a simulated skier's squat. Journal of Electromyography and Kinesiology, 14(6), 693-698. https://doi.org/10.1016/j.jelekin.2004.03.007

• Journal Article Type: Article
• Acceptance Date: Mar 19, 2004
• Online Publication Date: Jul 2, 2004
• Publication Date: 2004-12
• Deposit Date: Jan 21, 2021
• Journal: Journal of Electromyography and Kinesiology
• Print ISSN: 1050-6411
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 14
• Issue: 6
• Pages: 693-698
• DOI: https://doi.org/10.1016/j.jelekin.2004.03.007
• Keywords: Orthotics; Myoelectric fatigue; EMG; Median frequency
• Public URL: https://hull-repository.worktribe.com/output/3635323
• Publisher URL: https://www.sciencedirect.com/science/article/abs/pii/S1050641104000483?via%3Dihub