Eccentric calf muscle exercise produces a greater acute reduction in Achilles tendon thickness than concentric exercise


Autoria(s): Grigg, Nicole; Wearing, Scott C.; Smeathers, James E.
Data(s)

2009

Resumo

Objective: To investigate the acute effects of isolated eccentric and concentric calf muscle exercise on Achilles tendon sagittal thickness. ---------- Design: Within-subject, counterbalanced, mixed design. ---------- Setting: Institutional. ---------- Participants: 11 healthy, recreationally active male adults. ---------- Interventions: Participants performed an exercise protocol, which involved isolated eccentric loading of the Achilles tendon of a single limb and isolated concentric loading of the contralateral, both with the addition of 20% bodyweight. ---------- Main outcome measurements: Sagittal sonograms were acquired prior to, immediately following and 3, 6, 12 and 24 h after exercise. Tendon thickness was measured 2 cm proximal to the superior aspect of the calcaneus. ---------- Results: Both loading conditions resulted in an immediate decrease in normalised Achilles tendon thickness. Eccentric loading induced a significantly greater decrease than concentric loading despite a similar impulse (−0.21 vs −0.05, p<0.05). Post-exercise, eccentrically loaded tendons recovered exponentially, with a recovery time constant of 2.5 h. The same exponential function did not adequately model changes in tendon thickness resulting from concentric loading. Even so, recovery pathways subsequent to the 3 h time point were comparable. Regardless of the exercise protocol, full tendon thickness recovery was not observed until 24 h. ---------- Conclusions: Eccentric loading invokes a greater reduction in Achilles tendon thickness immediately after exercise but appears to recover fully in a similar time frame to concentric loading.

Identificador

http://eprints.qut.edu.au/32065/

Publicador

BMJ Publishing Group

Relação

DOI:10.1136/bjsm.2008.053165

Grigg, Nicole, Wearing, Scott C., & Smeathers, James E. (2009) Eccentric calf muscle exercise produces a greater acute reduction in Achilles tendon thickness than concentric exercise. British Journal of Sports Medicine, 43(4), pp. 280-283.

Fonte

Faculty of Health; Institute of Health and Biomedical Innovation; School of Exercise & Nutrition Sciences

Palavras-Chave #110600 HUMAN MOVEMENT AND SPORTS SCIENCE #Achilles Tendon #Morphology #Eccentric Exercise #Tendinopathy #Rehabilitation
Tipo

Journal Article