G.Massey et al. 2017_tendinous tissue properties_long-term resistance training_Acta_accepted.pdf (302.57 kB)

Tendinous tissue properties after short and long-term functional overload: Differences between controls, 12 weeks and 4 years of resistance training.

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posted on 12.01.2018, 11:40 by Garry J. Massey, Tom Balshaw, Thomas M. Maden-Wilkinson, Jonathan Folland
AIM: The potential for tendinous tissues to adapt to functional overload, especially after several years of exposure to heavy resistance training is largely unexplored. This study compared the morphological and mechanical characteristics of the patellar tendon and knee-extensor tendon-aponeurosis complex between young men exposed to long-term (4 years; n=16), short-term (12 weeks; n=15) and no (untrained controls; n=39) functional overload in the form of heavy resistance training. METHODS: Patellar tendon cross-sectional area, vastus-lateralis aponeurosis area and quadriceps femoris volume, plus patellar tendon stiffness and Young's modulus, and tendon-aponeurosis complex stiffness, were quantified with MRI, dynamometry and ultrasonography. RESULTS: As expected long-term trained had greater muscle strength and volume (+58% and +56% vs untrained, both P<0.001), as well as a greater aponeurosis area (+17% vs untrained, P<0.01), but tendon cross-sectional area (mean and regional) was not different between groups. Only long-term trained had reduced patellar tendon elongation/strain over the whole force/stress range, whilst both short-term and long-term overload groups had similarly greater stiffness/Young's modulus at high force/stress (short-term +25/22%, and long-term +17/23% vs untrained; all P<0.05). Tendon-aponeurosis complex stiffness was not different between groups (ANOVA, P = 0.149). CONCLUSION: Despite large differences in muscle strength and size, years of resistance training did not induce tendon hypertrophy. Both short-term and long-term overload, demonstrated similar increases in high force mechanical and material stiffness, but reduced elongation/strain over the whole force/stress range occurred only after years of overload, indicating a force/strain specific time-course to these adaptations. This article is protected by copyright. All rights reserved.

Funding

Part of this study was supported by a grant (reference 20194) awarded to Dr Folland from the Arthritis Research UK Centre for Sport, Exercise and Osteoarthritis.

History

School

  • Sport, Exercise and Health Sciences

Published in

Acta Physiol (Oxf)

Citation

MASSEY, G.J. ...et al., 2018. Tendinous tissue properties after short and long-term functional overload: Differences between controls, 12 weeks and 4 years of resistance training. Acta Physiologica, 222 (4), e13019.

Publisher

Wiley © Scandinavian Physiological Society

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

08/12/2017

Publication date

2017-12-18

Notes

This is the peer reviewed version of the following article: MASSEY, G.J. ...et al., 2018. Tendinous tissue properties after short and long-term functional overload: Differences between controls, 12 weeks and 4 years of resistance training. Acta Physiologica, 222 (4), e13019., which has been published in final form at https://doi.org/10.1111/apha.13019. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.

ISSN

1748-1708

eISSN

1748-1716

Language

en

Location

England

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