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Reduced muscle lengthening during eccentric contractions as a mechanism underpinning the repeated bout effect


Lau, WY and Blazevich, AJ and Newton, MJ and Wu, SS and Nosaka, K, Reduced muscle lengthening during eccentric contractions as a mechanism underpinning the repeated bout effect, American Journal of Physiology (Consolidated) ISSN 0002-9513 (2015) [Refereed Article]

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Purpose: This study investigated changes in electrical pain threshold (EPT) after repeated eccentric exercise bouts to test the hypothesis that fascia would become more sensitive than muscle when greater delayed onset muscle soreness (DOMS) is induced.

Methods: Ten young men performed two eccentric exercise bouts (ECC1, ECC2) consisting of ten sets of six maximal isokinetic eccentric contractions of the elbow flexors with the same arm separated by 4 weeks. Maximal voluntary isometric contraction torque, range of motion, muscle soreness assessed by a visual analogue scale (VAS) and pressure pain threshold (PPT) were measured before, immediately after and 15 days after exercise. EPT was assessed in the biceps brachii fascia (BBF), biceps brachii muscle, and brachialis fascia (BF) 1 day before, immediately after, and 1, 2 and 4 days after exercise.

Results: All measures showed smaller changes (P < 0.05) after ECC2 than ECC1. EPT decreased after both bouts and the largest decreases were evident at 2 days post-exercise (P < 0.05). The decreases in EPT after ECC1 were greater (P < 0.05) for both BBF (Baseline: 1.45 0.23 mA, 2 days post-exercise: 0.13 0.11 mA) and BF (1.64 0.29 mA, 0.26 0.2 mA) than muscle (1.56 0.29 mA, 0.69 0.33 mA). Changes in EPT were correlated with the changes in PPT (r = 0.630.87, P ≤ 0.05) but not with VAS (r = −0.01 to 0.50).

Conclusion: These results show that fascia becomes more sensitive than muscle to electrical stimulation after the initial eccentric exercise, suggesting that damage inflammation to fascia than muscle fibres is more associated with DOMS.

Item Details

Item Type:Refereed Article
Keywords:repeated bout effect, B-mode ultrasound, biceps brachii, myotendinous junction, delayed onset muscle soreness, muscle strength
Research Division:Health Sciences
Research Group:Sports science and exercise
Research Field:Exercise physiology
Objective Division:Health
Objective Group:Public health (excl. specific population health)
Objective Field:Injury prevention and control
UTAS Author:Wu, SS (Dr Sam Wu)
ID Code:100132
Year Published:2015
Deposited By:Health Sciences B
Deposited On:2015-05-04
Last Modified:2015-08-18

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