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Three-dimensional morphology and strain of the human Achilles free tendon immediately following eccentric heel drop exercise

journal contribution
posted on 10.07.2018, 00:00 by Steven Obst, R Newsham-West, RS Barrett
Our understanding of the immediate effects of exercise on Achilles free tendon transverse morphology is limited to single site measurements acquired at rest using 2D ultrasound. The purpose of this study was to provide a detailed 3D description of changes in Achilles free tendon morphology immediately following a single clinical bout of exercise. Freehand 3D ultrasound was used to measure Achilles free tendon length, and regional cross-sectional area (CSA), medio-lateral (ML) diameter and antero-posterior (AP) diameter in healthy young adults (N=14) at rest and during isometric muscle contraction, immediately before and after 3×15 eccentric heel drops. Post-exercise reductions in transverse strain were limited to CSA and AP diameter in the midproximal region of the Achilles free tendon during muscle contraction. The change in CSA strain during muscle contraction was significantly correlated to the change in longitudinal strain (r=−0.72) and the change in AP diameter strain (r=0.64). Overall findings suggest the Achilles free tendon experiences a complex change in 3D morphology following eccentric heel drop exercise that manifests under contractile but not rest conditions, is most pronounced in the mid-proximal tendon and is primarily driven by changes in AP diameter strain and not ML diameter strain.

History

Volume

218

Issue

24

Start Page

3894

End Page

3900

Number of Pages

7

eISSN

1477-9145

ISSN

0022-0949

Publisher

The Company of Biologists Ltd.

Peer Reviewed

Yes

Open Access

Yes

External Author Affiliations

Griffith University

Era Eligible

Yes

Journal

Journal of Experimental Biology

Exports

CQUniversity

Exports