TY - JOUR

T1 - No effect of β-alanine on muscle function and kayak performance

AU - Bech, Signe Refsgaard

AU - Nielsen, Tobias Schmidt

AU - Hald, Martin

AU - Jakobsen, Jarl Pors

AU - Nordsborg, Nikolai Baastrup

N1 - CURIS 2018 NEXS 075

PY - 2018

Y1 - 2018

N2 - PURPOSE: It was investigated if β-alanine supplementation counteracts muscular fatigue development or improves athletic performance.METHODS: Elite kayak rowers (10 males and 7 females) were supplemented with either 80 mg/kg body mass/day β-alanine or placebo for 8 weeks. Muscular fatigue development was investigated by applying a 2 min elbow flexor maximal voluntary contraction (MVC). Electromyography (EMG) was recorded continuously and voluntary activation (VA) was determined 30, 60, 90 and 115 s into the 2 min MVC. Additionally, performance was evaluated as 1000 m and 5 × 250 m kayak ergometer rowing.RESULTS: Force reduction during the 2 min MVC was similar before and after supplementation with β-alanine (30.9 ± 10.3 % vs 36.0 ± 14.1 %) and placebo (35.5 ± 7.7 % vs 35.1 ± 8.0 %). No time-effect was apparent in VA during the 2 min MVC. Additionally, there was no detectable effect of β-alanine supplementation on 1000 m kayak ergometer performance (β-alanine: 0.26 ± 0.02 % vs placebo: -0.18 ± 0.02 %) or accumulated 5 × 250 m time (β-alanine: -1.0 ± 0.3 % vs placebo: -1.0 ± 0.2 %). In 5 × 250 m, mean power output (MPO) was reduced to a similar extend from 1st to 5th interval before and after supplementation with β-alanine (23 ± 11 % vs 22 ± 10 %) and placebo (26 ± 13 % vs 20 ± 5 %).CONCLUSION: 2 min MVC characteristics are unaffected by β-alanine supplementation in elite kayakers and likewise both a 1000 m kayak ergometer time trial lasting 4-5 min as well as 5 × 250 m repeated sprint ability was unaltered by supplementation.

AB - PURPOSE: It was investigated if β-alanine supplementation counteracts muscular fatigue development or improves athletic performance.METHODS: Elite kayak rowers (10 males and 7 females) were supplemented with either 80 mg/kg body mass/day β-alanine or placebo for 8 weeks. Muscular fatigue development was investigated by applying a 2 min elbow flexor maximal voluntary contraction (MVC). Electromyography (EMG) was recorded continuously and voluntary activation (VA) was determined 30, 60, 90 and 115 s into the 2 min MVC. Additionally, performance was evaluated as 1000 m and 5 × 250 m kayak ergometer rowing.RESULTS: Force reduction during the 2 min MVC was similar before and after supplementation with β-alanine (30.9 ± 10.3 % vs 36.0 ± 14.1 %) and placebo (35.5 ± 7.7 % vs 35.1 ± 8.0 %). No time-effect was apparent in VA during the 2 min MVC. Additionally, there was no detectable effect of β-alanine supplementation on 1000 m kayak ergometer performance (β-alanine: 0.26 ± 0.02 % vs placebo: -0.18 ± 0.02 %) or accumulated 5 × 250 m time (β-alanine: -1.0 ± 0.3 % vs placebo: -1.0 ± 0.2 %). In 5 × 250 m, mean power output (MPO) was reduced to a similar extend from 1st to 5th interval before and after supplementation with β-alanine (23 ± 11 % vs 22 ± 10 %) and placebo (26 ± 13 % vs 20 ± 5 %).CONCLUSION: 2 min MVC characteristics are unaffected by β-alanine supplementation in elite kayakers and likewise both a 1000 m kayak ergometer time trial lasting 4-5 min as well as 5 × 250 m repeated sprint ability was unaltered by supplementation.

KW - Kayak ergometer

KW - VO2

KW - MVC

KW - Twitch force

KW - EMG

U2 - 10.1249/MSS.0000000000001447

DO - 10.1249/MSS.0000000000001447

M3 - Journal article

C2 - 28991036

VL - 50

SP - 562

EP - 569

JO - Medicine and Science in Sports and Exercise

JF - Medicine and Science in Sports and Exercise

SN - 0195-9131

IS - 3

ER -