Gratwicke Madeleine, Miles Kathleen H, Clark Brad, Pumpa Kate L
Discipline of Sport and Exercise Science, University of Canberra, Canberra, Australia.
Research Institute for Sport and Exercise, University of Canberra, Canberra, Australia.
Biol Sport. 2023 Apr;40(2):449-455. doi: 10.5114/biolsport.2023.116002. Epub 2022 Jun 1.
This double-blind randomised placebo-controlled trial aimed to investigate the effects of α-lactalbumin consumption on sleep quality and quantity in female rugby union athletes during a competition season. Eighteen semi-professional female rugby union players (age 23.8 ± 5.2 y; mean ± SD) wore wrist actigraphy watches for four seven-day blocks corresponding to the pre-season, a home game, a bye week (i.e. no competition game scheduled) and an away game. Participants consumed either an α-lactalbumin (α-LAC), or placebo drink (PLA) every night two hours before bed for the duration of the season. Generalised linear mixed models were used to investigate the effects of the nutritional intervention on sleep variables (total sleep time, sleep efficiency (SE), sleep onset latency (SOL) and wake after sleep onset) over the duration of the season. There was a significant condition by period interaction effect on SOL (p = 0.01). While similar at baseline (23.3 ± 16.3 and 23.2 ± 18.9 min α-LAC and placebo respectively) and for the home game (22.4 ± 17.6 and 19.3 ± 14.9 min α-LAC and placebo respectively), SOL was reduced in the α-LAC group for the bye (11.6 ± 13.4 min) and away game (17.0 ± 11.5 min; p = 0.045). In comparison, SOL remained unchanged in the PLA group (bye 21.2 ± 17.3 and away 22.5 ± 18.5 min). Pre-sleep α-lactalbumin consumption improved SOL in a semi-professional female team-sport cohort. Thus, α-lactalbumin could be utilised by athletes to support sleep during a competitive season.
这项双盲随机安慰剂对照试验旨在研究在比赛赛季中,摄入α-乳白蛋白对女子英式橄榄球运动员睡眠质量和睡眠时间的影响。18名半职业女子英式橄榄球运动员(年龄23.8±5.2岁;均值±标准差)佩戴腕部活动记录仪手表,记录对应季前赛、主场比赛、轮空周(即没有安排比赛)和客场比赛的四个为期七天的时间段。在整个赛季中,参与者每晚睡前两小时饮用α-乳白蛋白(α-LAC)或安慰剂饮料(PLA)。使用广义线性混合模型来研究营养干预对整个赛季睡眠变量(总睡眠时间、睡眠效率(SE)、入睡潜伏期(SOL)和睡眠中觉醒)的影响。在SOL方面存在显著的条件与时间段交互效应(p = 0.01)。虽然在基线时(α-LAC组和安慰剂组分别为23.3±16.3分钟和23.2±18.9分钟)以及主场比赛时(α-LAC组和安慰剂组分别为22.4±17.6分钟和19.3±14.9分钟)相似,但在轮空周(11.6±13.4分钟)和客场比赛时(17.0±11.5分钟;p = 0.045),α-LAC组的SOL缩短。相比之下,PLA组的SOL保持不变(轮空周为21.2±17.3分钟,客场比赛为22.5±18.5分钟)。睡前摄入α-乳白蛋白可改善半职业女子团队运动人群的SOL。因此,运动员可以利用α-乳白蛋白在比赛赛季中辅助睡眠。