O073 The Relationship between Circadian type and Physical Activity on Cognitive Performance during Simulated Nightshifts: A Randomised Controlled Trial.

D Easton, C Gupta, G Vincent, S Ferguson
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Abstract

Abstract Introduction Physical activity might be a nonphotic strategy which could improve cognitive performance for nightshift workers. Innate characteristics like circadian type may also influence individual performance. Thus, this study explores the relationship between circadian type and physical activity on cognition over consecutive nightshifts. Methods Thirty-two healthy adults (age M±SD: 24.3±4.6 years; 19 females) participated in a 7-day laboratory study, with 5 nightshifts (2200-0600). Participants were randomised into the Breaking up sitting (BUS; n=19) or Sedentary (SED; n=13) condition. Overnight, BUS participants completed 3-min bouts of light-intensity walking every 30-min, while SED participants remained seated. At 2200, 0000, 0200, 0400 and 0600, participants completed the 10-min Psychomotor Vigilance Task (mean RRT). Participants completed the 11-item revised Circadian Type Inventory (factor 1: rigid/flexible; factor 2: languid/vigorous), resulting in four-subgroups (rigid; n= 12, flexible; n= 11, and languid; n= 11, vigorous; n= 13). Participants may only be one type from either factor (i.e. rigid and vigorous). Results Linear mixed models showed a significant 3-way interaction between nightshift (1-5), condition (BUS, SED), and circadian type (rigid/flexible) for mean RRT (p=0.03), such that flexible types in the Breaking up sitting condition outperformed Sedentary flexible types and Breaking up sitting rigid types, with performance worse on the first nightshift. There were no significant interactions between nightshift, condition and circadian type (languid/vigorous). Discussion Breaking up sitting improved performance for flexible types over rigid types. These findings have significant implications for nightshift rostering, suggesting that incorporating breaking up sitting may optimise cognitive performance, and therefore work efficiency.
模拟夜班期间昼夜节律类型和身体活动对认知表现的关系:一项随机对照试验。
体育锻炼可能是一种非光性策略,可以改善夜班工作者的认知表现。生理节律类型等先天特征也可能影响个人表现。因此,本研究探讨了昼夜节律类型与连续夜班中身体活动对认知的关系。方法32例健康成人(年龄M±SD: 24.3±4.6岁;19名女性)参加了为期7天的实验室研究,5个夜班(2200-0600)。参与者被随机分配到分手坐(BUS;n=19)或久坐(SED;n = 13)条件。夜间,BUS组参与者每30分钟进行一次3分钟的轻强度步行,而SED组参与者则保持坐姿。在22:00,0200,0400和0600,参与者完成了10分钟的精神运动警戒任务(平均RRT)。参与者完成了11项修订的昼夜节律类型量表(因子1:刚性/柔性;因子2:懒散/活力),产生四个亚群(僵硬;N = 12,柔性;N = 11,倦怠;N = 11,旺盛;n = 13)。参与者只能是其中一种类型(即刚性和活力)。结果线性混合模型显示,夜班(1-5)、状态(BUS、SED)和昼夜节律类型(刚性/弹性)对平均RRT有显著的3向交互作用(p=0.03),即打破坐姿的灵活类型优于久坐的灵活类型和打破坐姿的刚性类型,其中第一个夜班的表现更差。夜班、病情和昼夜节律类型(懒散/旺盛)之间没有显著的相互作用。打破坐姿可以提高灵活型运动员的表现,而不是僵硬型运动员。这些发现对夜班排班有重要意义,表明休息可以优化认知能力,从而提高工作效率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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