Young men utilise limited neuromuscular prepartion to regulate post-impact knee mechanics during step landing
Data(s) |
01/01/2014
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Resumo |
Purpose The neuromuscular mechanisms determining the mechanical behaviour of the knee during landing impact remain poorly understood. It was hypothesised that neuromuscular preparation is subject-specific and ranges along a continuum from passive to active. Methods A group of healthy men (N = 12) stepped-down from a knee-high platform for 60 consecutive trials. Surface EMG of the quadriceps and hamstrings was used to determine pre-impact onset timing, activation amplitude and cocontraction for each trial. Partial least squares regression was used to associate pre-impact preparation with post-impact knee stiffness and coordination. Results The group analysis revealed few significant changes in pre-impact preparation across trial blocks. Single-subject analyses revealed changes in muscle activity that varied in size and direction between individuals. Further, the association between pre-impact preparation and post-impact knee mechanics was subject-specific and ranged along a continuum of strategies. Conclusion The findings suggest that neuromuscular preparation during step landing is subject-specific and its association to post-impact knee mechanics occurs along a continuum, ranging from passive to active control strategies. Further work should examine the implications of these strategies on the distribution of knee forces in-vivo. |
Identificador | |
Publicador |
Elsevier |
Relação |
DOI:10.1016/j.gaitpost.2013.07.127 Scholes, Corey J., McDonald, Michael D., & Parker, Anthony W. (2014) Young men utilise limited neuromuscular prepartion to regulate post-impact knee mechanics during step landing. Gait and Posture, 39(1), pp. 284-290. |
Direitos |
Copyright 2013 Elsevier |
Fonte |
Faculty of Health; Institute of Health and Biomedical Innovation; School of Exercise & Nutrition Sciences |
Palavras-Chave | #110000 MEDICAL AND HEALTH SCIENCES #110601 Biomechanics #Electromyography #Pre-impact preparation #Knee #Stiffness #Coordination |
Tipo |
Journal Article |