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Effect of New Zealand Blackcurrant Extract on Force Steadiness of the Quadriceps Femoris Muscle during Sustained Submaximal Isometric Contraction

Cook, Matthew ORCID: https://orcid.org/0000-0002-6293-7566, Dunne, A., Bosworth, M. and Willems, M. (2022) Effect of New Zealand Blackcurrant Extract on Force Steadiness of the Quadriceps Femoris Muscle during Sustained Submaximal Isometric Contraction. Journal of Functional Morphology and Kinesiology, 7 (2). p. 44. ISSN 2411-5142

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Abstract

Intake of anthocyanin-rich New Zealand blackcurrant (NZBC) can alter physiological
responses that enhance exercise performance. In two studies, we examined the effects of NZBC
extract on force steadiness during a sustained submaximal isometric contraction of the quadriceps
femoris muscle. With repeated measures designs, male participants in study one (n = 13) and study
two (n = 19) performed a 120 s submaximal (30%) isometric contraction of the quadriceps femoris
muscle following a 7-day intake of NZBC extract and placebo (study one) and following 0 (control),
1-, 4- and 7-day intake of NZBC extract (study two). Participants for both studies were different. In
study one, NZBC extract enhanced isometric force steadiness during the 120 s contraction (placebo:
6.58 ± 2.24%, NZBC extract: 6.05 ± 2.24%, p = 0.003), with differences in the third (60–89 s) and
fourth quartile (90–120 s) of the contraction. In study two, isometric force steadiness was not changed
following 1 and 4 days but was enhanced following 7-day intake of NZBC extract in comparison
to control. In study two, the enhanced isometric force steadiness following 7-day intake did occur
in the second (30–59 s), third (60–89 s) and fourth (90–120 s) quartiles. Daily supplementation of
anthocyanin-rich NZBC extract can enhance force steadiness of the quadriceps femoris muscle during
a sustained submaximal isometric contraction. Our observations may have implications for human
tasks that require postural stability.

Item Type: Article
Additional Information:

This article belongs to the Special Issue Muscle Strength and Power.

Copyright: © This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Uncontrolled Discrete Keywords: steadiness, blackcurrant, anthocyanins, isometric force, balance
Subjects: Q Science > QP Physiology
Divisions: College of Business, Psychology and Sport > School of Sport and Exercise Science
Related URLs:
Copyright Info: Open Access article
Depositing User: Matthew Cook
Date Deposited: 31 May 2022 10:52
Last Modified: 31 May 2022 10:52
URI: https://eprints.worc.ac.uk/id/eprint/12178

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