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Title: Gastrocnemius muscle specific force in boys and men
Authors: Morse, Christopher I.
Tolfrey, Keith
Thom, Jeanette M.
Vassilopoulos, Vasilios
Maganaris, Constantinos N.
Narici, Marco V.
Issue Date: 2008
Publisher: © American Physiological Society
Citation: MORSE, C.I. ... et al, 2008. Gastrocnemius muscle specific force in boys and men. Journal of Applied Physiology, 104 (2), pp. 469 - 474.
Abstract: The aim of this study was to assess whether the in vivo specific force and architectural characteristics of the lateral gastrocnemius (GL) muscle of early pubescent boys (n=11, age 10.9 ±0.3 yr, Tanner stage 2) differed from those of adult men (n=12, age 25.3 ±4.4 yr). Plantarflexor torque was 55% lower in the boys (77.4±21.4 Nm) compared with the adults (175.631.7 Nm,P0.01). Physiological cross-sectional area (PCSA), determined in vivo using ultrasonography and MRI, was 52% smaller in the boys (P0.01). No difference was found in pennation angle, or in the ratio of fascicle length (Lf)to muscle length between the boys and men. Moment arm length was 25% smaller in the boys (P0.01). Antagonist coactivation, assessed using surface EMG on the dorsiflexors, was not different between the boys and men (11.86.7% and 13.55.8%, respectively). Surprisingly, GL force normalized to PCSA (specific force) was significantly higher (21%) in the boys than in the men (13.12.0 vs. 15.92.7N/cm2,P0.05). This finding could not be explained by differences in moment arm length, muscle activation, or architecture, and other factors, such as tendinous characteristics and/or changes in moment arm length with contraction, may be held responsible. These observations warrant further investigation
Description: This article is closed access.
Version: Accepted for publication
DOI: 10.1152/japplphysiol.00697.2007
URI: https://dspace.lboro.ac.uk/2134/15147
Publisher Link: http://dx.doi.org/10.1152/japplphysiol.00697.2007
ISSN: 8750-7587
Appears in Collections:Closed Access (Sport, Exercise and Health Sciences)

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