Facial reconstruction

Search LJMU Research Online

Browse Repository | Browse E-Theses

Muscle and tendon adaptations to moderate load eccentric vs. concentric resistance exercise in young and older males.

Quinlan, JI, Franchi, MV, Gharahdaghi, N, Badiali, F, Francis, S, Hale, A, Phillips, BE, Szewczyk, N, Greenhaff, PL, Smith, K, Maganaris, CN, Atherton, PJ and Narici, MV (2021) Muscle and tendon adaptations to moderate load eccentric vs. concentric resistance exercise in young and older males. Geroscience. ISSN 2509-2715

[img]
Preview
Text
Muscle and tendon adaptations to moderate load eccentric vs. concentric resistance exercise in young and older males.pdf - Published Version
Available under License Creative Commons Attribution.

Download (1MB) | Preview

Abstract

Resistance exercise training (RET) is well-known to counteract negative age-related changes in both muscle and tendon tissue. Traditional RET consists of both concentric (CON) and eccentric (ECC) contractions; nevertheless, isolated ECC contractions are metabolically less demanding and, thus, may be more suitable for older populations. However, whether submaximal (60% 1RM) CON or ECC contractions differ in their effectiveness is relatively unknown. Further, whether the time course of muscle and tendon adaptations differs to the above is also unknown. Therefore, this study aimed to establish the time course of muscle and tendon adaptations to submaximal CON and ECC RET. Twenty healthy young (24.5 ± 5.1 years) and 17 older males (68.1 ± 2.4 years) were randomly allocated to either isolated CON or ECC RET which took place 3/week for 8 weeks. Tendon biomechanical properties, muscle architecture and maximal voluntary contraction were assessed every 2 weeks and quadriceps muscle volume every 4 weeks. Positive changes in tendon Young's modulus were observed after 4 weeks in all groups after which adaptations in young males plateaued but continued to increase in older males, suggesting a dampened rate of adaptation with age. However, both CON and ECC resulted in similar overall changes in tendon Young's modulus, in all groups. Muscle hypertrophy and strength increases were similar between CON and ECC in all groups. However, pennation angle increases were greater in CON, and fascicle length changes were greater in ECC. Notably, muscle and tendon adaptations appeared to occur in synergy, presumably to maintain the efficacy of the muscle-tendon unit.

Item Type: Article
Uncontrolled Keywords: Ageing; Eccentric; Muscle; Submaximal RET; Tendon
Subjects: R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Sport & Exercise Sciences
Publisher: Springer
Related URLs:
Date Deposited: 07 Jul 2021 10:02
Last Modified: 07 Jul 2021 10:02
DOI or Identification number: 10.1007/s11357-021-00396-0
URI: https://researchonline.ljmu.ac.uk/id/eprint/15256

Actions (login required)

View Item View Item