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Force production capacity and functional reflex activity in young and elderly men

Granacher, Urs ; Gruber, Markus ; Gollhofer, Albert

In: Aging Clinical and Experimental Research, 2010, vol. 22, no. 5-6, p. 374-382

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    Titre
    • Force production capacity and functional reflex activity in young and elderly men
    Auteur
    • Granacher, Urs. Institute of Exercise and Health Sciences, University of Basel, Birsstr. 320B, 4052, Basel, Switzerland
    • Gruber, Markus. Department of Training and Movement Science, University of Potsdam, Germany
    • Gollhofer, Albert. Institute of Sport and Sport Science, University of Freiburg, Germany
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Aging Clinical and Experimental Research, 2010, vol. 22, no. 5-6, p. 374-382. Springer International Publishing
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:312678
    Summary
    Background and aims: There is growing evidence that biological aging results in impaired force production of the lower extremities and deficits in reflex activity. This study therefore investigated maximal and explosive force production capacity, functional reflex activity (FRA) during gait perturbations, and the relationship between variables of force production capacity and FRA in young and elderly men. Methods: Twenty-eight young (age 27±3 yrs, n=14) and old (age 67±4 yrs, n=14) healthy active men were tested for decelerating impulses on a treadmill and for their maximal isometric leg extension force (MIF) and rate of force development (RFD) on a leg-press. Results: MIF and RFD were significantly lower in the elderly than in younger participants (MIF ≈45%, p<0.01; RFD ≈50%, p<0.01). Elderly subjects showed significant decreases in FRA in the prime mover which compensated for the decelerating impulse (FRA ≈29%, p<0.05). No significant correlations were found between FRA, MIF or RFD. Conclusions: Lower MIF, RFD and impaired FRA were found in old compared with young men. The absence of significant correlations between measures of strength performance and FRA may indicate that different mechanisms within the neuromuscular system are responsible for these capacities. This result may imply that force production and functional reflex activity are independent of each other and may have to be trained complementarily