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J Int Soc Sports Nutr. 2017 Jul 12;14:23. doi: 10.1186/s12970-017-0176-9. eCollection 2017.

Effect of eicosapentaenoic acids-rich fish oil supplementation on motor nerve function after eccentric contractions.

Author information

1
Faculty of Bioscience and Applied Chemistry, Hosei University, 3-7-2, Kajino, Koganei, 184-8584 Japan.
2
Faculty of Modern life, Teikyo Heisei University, Tokyo, Japan.
3
Human Life Science R&D Center, Nippon Suisan Kaisha, Ltd, Tokyo, Japan.

Abstract

BACKGROUND:

This study investigated the effect of supplementation with fish oil rich in eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) on the M-wave latency of biceps brachii and muscle damage after a single session of maximal elbow flexor eccentric contractions (ECC).

METHODS:

Twenty-one men were completed the randomized, double-blind, placebo-controlled, and parallel-design study. The subjects were randomly assigned to the fish oil group (n = 10) or control group (n = 11). The fish oil group consumed eight 300-mg EPA-rich fish oil softgel capsules (containing, in total, 600 mg EPA and 260 mg DHA) per day for 8 weeks before the exercise, and continued this for a further 5 days. The control group consumed an equivalent number of placebo capsules. The subjects performed six sets of ten eccentric contractions of the elbow flexors using a dumbbell set at 40% of their one repetition maximum. M-wave latency was assessed as the time taken from electrical stimulation applied to Erb's point to the onset of M-wave of the biceps brachii. This was measured before and immediately after exercise, and then after 1, 2, 3, and 5 days. Changes in maximal voluntary isometric contraction (MVC) torque, range of motion (ROM), upper arm circumference, and delayed onset muscle soreness (DOMS) were assessed at the same time points.

RESULTS:

Compared with the control group, M-wave latency was significantly shorter in the fish oil group immediately after exercise (p = 0.040), MVC torque was significantly higher at 1 day after exercise (p = 0.049), ROM was significantly greater at post and 2 days after exercise (post; p = 0.006, day 2; p = 0.014), and there was significantly less delayed onset muscle soreness at 1 and 2 days after exercise (day 1; p = 0.049, day 2; p = 0.023).

CONCLUSION:

Eight weeks of EPA and DHA supplementation may play a protective role against motor nerve function and may attenuate muscle damage after eccentric contractions.

TRIAL REGISTRATION:

This trial was registered on July 14th 2015 (https://upload.umin.ac.jp/cgi-open-bin/ctr/index.cgi).

KEYWORDS:

Eicosapentaenoic acid; Lengthening contractions; M-wave; Muscle damage; Nerve damage; Supplement

PMID:
28717347
PMCID:
PMC5508798
DOI:
10.1186/s12970-017-0176-9
[Indexed for MEDLINE]
Free PMC Article

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