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Effect of acute tensile loading on gender‐specific tendon structural and mechanical properties
Author(s) -
Burgess Katherine E.,
GrahamSmith Phillip,
Pearson Stephen J.
Publication year - 2009
Publication title -
journal of orthopaedic research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.041
H-Index - 155
eISSN - 1554-527X
pISSN - 0736-0266
DOI - 10.1002/jor.20768
Subject(s) - tendon , medicine , stiffness , ultimate tensile strength , biomechanics , anatomy , materials science , composite material
Stretching is commonly used prior to exercise, as it is thought to reduce the risk of injury, and it is also used in the preconditioning of tendon grafts. As tendon properties have been shown to be different between genders, it is proposed that stretching will differentially affect the structure. Here we examine the effect of acute stretch on the mechanical properties of both male and female medial gastrocnemius tendon. Female [20 years ± 1 (SEM), n = 17] and male (22 years ± 1, n = 18) subjects underwent a 5‐min passive dorsiflexion stretch. Prior to and post stretch medial gastrocnemius tendon stiffness ( K ), length (l) and cross‐sectional area (csa) were measured using ultrasonography and dynamometry. Stiffness and Young's modulus (ε) were significantly reduced with stretch for both genders ( p < 0.05). Females showed significantly ( p < 0.05) greater pre‐ to poststretch decreases in K (22.4 vs. 8.8%) and ε (20.5 vs. 8.4%) in comparison to males. The present results show that stretching acutely reduces stiffness of the medial gastrocnemius tendon in females and males, with females showing significantly greater change. The observed disparity between genders may be due in part to variations in tendon moment arm and intrinsic differences in tendon composition. These differential changes in tendon mechanical properties have functional, motor control, and injury risk implications, as well as possible implications for preconditioning of tendon grafts. © 2008 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 27: 510–516, 2009