O045 Sleep Duration is Associated with Young Adult's Heart Rate Variability Response to Stress

S Gadam, K Rossa, C Pattinson, S Shekari Soleimanloo, D Mann, P Salmon, K Sullivan, S Smith
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Abstract

Abstract Introduction Young adulthood is a critical developmental period typified by heightened exposure to stress, and a tendency towards insufficient sleep. The relationship between sleep loss and stress may have lifelong health consequences. Currently, our understanding of this relationship in young adults is limited. Heart rate variability (HRV) is an important indicator of balance in the autonomic nervous system. We examined the association between sleep duration and HRV in response to cognitive stressors. Methods Seventy-six young adults (M=20.6±1.9, 72.4% female) who self-identified as short sleepers were recruited. Habitual sleep duration was monitored with actigraphy for two weeks. Participants subsequently underwent an in-lab experiment where their HRV was recorded during baseline, and during a cognitive stress condition involving the completion of computerised cognitive stress tasks. Participants also reported their habitual stress levels and sleep quality. Results Actigraphy assessment revealed that participants slept within the recommended sleep durations (M=7.8±0.7). The participants reported high habitual stress but normal sleep quality. Our moderation analysis indicates that shorter sleep duration was associated with elevated HRV during the cognitively demanding tasks. Conclusions Our findings demonstrate an association between sleep duration and HRV in the context of a cognitive stressor, indicating that sleep and stress are related in young adults. An unexpected negative relationship between sleep duration and HRV during the cognitively demanding tasks suggests complexity in this relationship; however, we should still look to reduce stress and improve sleep where we can in young adults. This association may be better understood via direct manipulation of sleep duration.
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睡眠时长与年轻人心率变异性对压力的反应有关
青年期是一个关键的发育时期,典型的特点是高度暴露于压力,并倾向于睡眠不足。睡眠不足和压力之间的关系可能会对健康产生终生的影响。目前,我们对这种关系在年轻人中的理解是有限的。心率变异性(HRV)是自主神经系统平衡的重要指标。我们研究了睡眠时间和心率波动之间的关系,以应对认知压力。方法招募自认短睡眠者76例(M=20.6±1.9,其中女性72.4%)。用活动记录仪监测习惯性睡眠持续时间两周。随后,参与者进行了一项实验室实验,记录了他们在基线和认知压力条件下(包括完成计算机化的认知压力任务)的HRV。参与者还报告了他们的习惯性压力水平和睡眠质量。结果活动描记评估显示,受试者睡眠时间均在推荐睡眠时间范围内(M=7.8±0.7)。参与者报告说,他们的习惯性压力很大,但睡眠质量正常。我们的适度分析表明,在认知要求较高的任务中,较短的睡眠时间与HRV升高有关。我们的研究结果表明,在认知压力源的背景下,睡眠时间和心率变异之间存在关联,这表明睡眠和压力在年轻人中是相关的。在认知要求较高的任务中,睡眠时间与心率变异性之间的负相关表明了这种关系的复杂性;然而,我们仍然应该尽可能减少压力,改善年轻人的睡眠。这种联系可以通过直接控制睡眠时间来更好地理解。
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