Title

The relationship between passive stiffness and muscle power output: Influence of muscle CSA normalization

Document Type

Article

Journal/Book Title/Conference

Muscle and Nerve

Volume

49

Issue

1

Publisher

Wiley

Publication Date

10-4-2013

First Page

69

Last Page

75

DOI

10.1002/mus.23861

Abstract

Introduction: We examined the relationshipbetween passive stiffness of posterior hip and thigh musclesand muscle power output before and after nor malization of pas-sive stiffness to muscle cross-sectional area (CSA). Methods:Pearson correlation coefficients (r) were used to assess the rela-tionships between the normalized and non-normalized slopes ofthe initial (phase 1) and final (phase 2) portions of the angle–tor-que curve and peak power output (Pmax). Results: A significantpositive relationship was observed between the non-normalizedslope of phase 1 and Pmax (r 5 0.723; P  0.001); however, nocorrelations were observed between the normalized slope ofphase 1 and Pmax (r 5 0.244; P 5 0.299) nor between Pmax andthe nor malized and non-normalized slopes of phase 2(r 520.159–0.418; P 5 0.067–0.504). Conclusions: The findingssuggest that muscle size, rather than stiffness, accounted for asignificant portion of the variance in muscle power output.

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