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dc.contributor.authorHannah, Riccien
dc.contributor.authorJones, Rebecca Louiseen
dc.contributor.authorMinshull, Claireen
dc.contributor.authorArtioli, Guilherme Gianninien
dc.contributor.authorHarris, Roger C.en
dc.contributor.authorSale, Craigen
dc.date.accessioned2017-09-22T11:26:00Z
dc.date.available2017-09-22T11:26:00Z
dc.date.issued2015-03-01
dc.identifier.citationHannah R., Stannard R.L., Minshull C., Artioli G.G., Harris R.C, Sale C (2015) 'β-alanine supplementation enhances human skeletal muscle relaxation speed but not force production capacity', Journal of Applied Physiology, 118 (5), pp.604-612.en
dc.identifier.issn8750-7587
dc.identifier.doi10.1152/japplphysiol.00991.2014
dc.identifier.urihttp://hdl.handle.net/10547/622223
dc.description.abstractPURPOSE: β-alanine (BA) supplementation improves human exercise performance. One possible explanation for this is an enhancement of muscle contractile properties, occurring via elevated intramuscular carnosine resulting in improved calcium sensitivity and handling. This study investigated the effect of BA supplementation on in vivo contractile properties and voluntary neuromuscular performance. METHODS: Twenty-three men completed two experimental sessions, pre- and post-28 days supplementation with 6.4 g·d-1 39 of BA (n = 12) or placebo (PLA; n = 11). During each session, force was recorded during a series of knee extensor contractions: resting and potentiated twitches and octet (8 pulses, 300 Hz) contractions elicited via femoral nerve stimulation; tetanic contractions (1 s, 1 – 100 Hz) via superficial muscle stimulation; and maximum and explosive voluntary contractions. RESULTS: BA supplementation had no effect on the force-frequency relationship, or the force responses (force at 25 ms and 50 ms from onset, peak force) of resting or potentiated twitches, and octet contractions (P > 0.05). Resting and potentiated twitch electromechanical delay and time-to-peak tension were unaffected by BA supplementation (P > 0.05), although half-relaxation time declined by 7-12% (P < 0.05). Maximum and explosive voluntary forces were unchanged after BA supplementation. CONCLUSION: BA supplementation had no effect on evoked force responses, implying that altered calcium sensitivity and/or release are not the mechanisms by which BA supplementation influences exercise performance. The reduced half-relaxation time with BA supplementation might, however, be explained by enhanced reuptake of calcium, which has implications for the efficiency of muscle contraction following BA supplementation.
dc.language.isoenen
dc.publisherAmerican Physiological Societyen
dc.relation.urlhttp://jap.physiology.org/content/118/5/604en
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectbeta-alanineen
dc.subjectmuscle contractile propertiesen
dc.subjectelectrical stimulationen
dc.subjectforce-frequency relationshipen
dc.subjectC600 Sports Scienceen
dc.titleβ-alanine supplementation enhances human skeletal muscle relaxation speed but not force production capacityen
dc.title.alternativeβ-alanine supplementation and muscle contractile propertiesen
dc.typeArticleen
dc.identifier.eissn1522-1601
dc.identifier.journalJournal of Applied Physiologyen
dc.date.updated2017-09-22T11:03:50Z
html.description.abstractPURPOSE: β-alanine (BA) supplementation improves human exercise performance. One possible explanation for this is an enhancement of muscle contractile properties, occurring via elevated intramuscular carnosine resulting in improved calcium sensitivity and handling. This study investigated the effect of BA supplementation on in vivo contractile properties and voluntary neuromuscular performance. METHODS: Twenty-three men completed two experimental sessions, pre- and post-28 days supplementation with 6.4 g·d-1 39 of BA (n = 12) or placebo (PLA; n = 11). During each session, force was recorded during a series of knee extensor contractions: resting and potentiated twitches and octet (8 pulses, 300 Hz) contractions elicited via femoral nerve stimulation; tetanic contractions (1 s, 1 – 100 Hz) via superficial muscle stimulation; and maximum and explosive voluntary contractions. RESULTS: BA supplementation had no effect on the force-frequency relationship, or the force responses (force at 25 ms and 50 ms from onset, peak force) of resting or potentiated twitches, and octet contractions (P > 0.05). Resting and potentiated twitch electromechanical delay and time-to-peak tension were unaffected by BA supplementation (P > 0.05), although half-relaxation time declined by 7-12% (P < 0.05). Maximum and explosive voluntary forces were unchanged after BA supplementation. CONCLUSION: BA supplementation had no effect on evoked force responses, implying that altered calcium sensitivity and/or release are not the mechanisms by which BA supplementation influences exercise performance. The reduced half-relaxation time with BA supplementation might, however, be explained by enhanced reuptake of calcium, which has implications for the efficiency of muscle contraction following BA supplementation.


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