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Influence of exercise intensity on training-induced tendon mechanical properties changes in older individuals.

Grosset, Jean-Francois; Breen, Leigh; Stewart, Claire E.; Burgess, Katherine E.; Onambélé, Gladys L.

Authors

Jean-Francois Grosset

Leigh Breen

Claire E. Stewart

Gladys L. Onambélé



Abstract

This study compared the effects of low vs. high intensity training on tendon properties in an elderly population. Participants were pair-matched (gender, habitual physical activity, anthropometrics, and baseline knee extension strength) and then randomly assigned to low (LowR, i.e., ~40 % 1RM) or high (High R, i.e., ~80 % 1RM) intensity resistance training programmes for 12 weeks, 3x per week (LowR, n = 9, age 74 ± 5 years; HighR, n = 8, age 68 ± 6 years). Patellar tendon properties (stiffness [K], Young's modulus [YM], cross-sectional area [T CSA], and tendon length [T L]) were measured pre and post training using a combination of magnetic resonance imaging (MRI), B-mode ultrasonography, dynamometry, electromyography and ramped isometric knee extensions. With training K showed no significant change in the LowR group while it incremented by 57.7 % in the HighR group (p < 0.05). The 51.1 % group difference was significant (p < 0.05). These differences were still apparent when the data was normalized for T CSA and T L, i.e., significant increase in YM post-intervention in HighR (p < 0.05), but no change in LowR. These findings suggest that when prescribing exercise for a mixed genders elderly population, exercise intensities of ≤40 % 1RM may not be sufficient to affect tendon properties.

Citation

GROSSET, J.-F., BREEN, L., STEWART, C.E., BURGESS, K.E. and ONAMBÉLÉ, G.L. 2014. Influence of exercise intensity on training-induced tendon mechanical properties changes in older individuals. AGE [online], 36(3), article number 9657. Available from: https://doi.org/10.1007/s11357-014-9657-9

Journal Article Type Article
Acceptance Date Apr 13, 2014
Online Publication Date Apr 24, 2014
Publication Date Jun 30, 2014
Deposit Date Sep 4, 2023
Publicly Available Date Oct 31, 2023
Journal AGE
Print ISSN 0161-9152
Electronic ISSN 1574-4647
Publisher Springer
Peer Reviewed Peer Reviewed
Volume 36
Issue 3
Pages 1433-1442
DOI https://doi.org/10.1007/s11357-014-9657-9
Keywords Elderly; Tendon properties; Resistance training; Load intensity
Public URL https://rgu-repository.worktribe.com/output/2060299

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