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Neuromechanics of repeated stepping with external loading in young and older women

Mair, Jacqueline L, Laudani, Luca, Vannozzi, Giuseppe, De Vito, Giuseppe, Boreham, Colin and Macaluso, Andrea (2014) Neuromechanics of repeated stepping with external loading in young and older women. European Journal of Applied Physiology, 114 (5). pp. 983-994. [Journal article]

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DOI: 10.1007/s00421-014-2826-9

Abstract

PURPOSE:An understanding of the neuromechanical responses to bench stepping with external loading is important for exercise prescription, especially in older women who are more at risk than men for disability. This study was designed to describe and compare such responses to repeated bench stepping with external loading between young and older women.METHODS:Eight young (25 ± 2.7 years) and nine older (70 ± 3.3 years) medically stable women performed repeated stepping on a bench of either 20 or 25 cm either unloaded or with 2.5, 5, 7.5 or 10 % of body mass (BM) incorporated into a weighted vest. Ground reaction forces, peak power output and agonist-antagonist neuromuscular activation around the knee joint were evaluated.RESULTS:Peak power output was 44 % lower in the older than in the younger women. At a step height of 25 cm, peak power (PP) in the young women was 7 % greater with an external load of 7.5 % body mass compared with no loading, while in the older women there was a tendency for PP to be higher with an external load of 2.5 % body mass. Neuromuscular activation of the vastus lateralis muscle was 60 % higher in the older than in the young women.CONCLUSIONS:Older women performed repeated weighted-vest stepping with lower power output but greater knee muscle activation compared to younger counterparts. Peak power output during stepping may be achieved at 7.5 % BM loading in young women and either 2.5 or 10 % BM in older women, depending on desired step height.

Item Type:Journal article
Faculties and Schools:Faculty of Life and Health Sciences > School of Sport
Faculty of Life and Health Sciences
Research Institutes and Groups:Sport and Exercise Sciences Research Institute
Sport and Exercise Sciences Research Institute > Centre for Physical Activity and Health
ID Code:28864
Deposited By: Dr Jacqueline Mair
Deposited On:13 May 2014 08:10
Last Modified:17 Oct 2017 16:13

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