Effect of napping on a bean bag chair on sleep stage, muscle activity, and heart rate variability

Nishida, Masaki; Ichinose, Atsushi; Murata, Yusuke; Shioda, Kohei

doi:10.7717/peerj.13284

Cited by 2 publications

(1 citation statement)

References 46 publications

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“…The importance of sleep environment and its beneficial physiological effects are gaining attention. Recent studies have validated the optimization of sleep environments, such as bedding, mattresses [2][3][4], or chairs [5]. These studies examined the usefulness of the sleep environment of bedding in terms of sleep variables and physiological indicators such as core body temperature (CBT), autonomic nervous function, and electromyography.…”

Section: Introductionmentioning

confidence: 99%

Physiological Evaluation of Far Infrared-Emitting Garments on Sleep and Thermoregulation

Nishida,

Nishii,

Suyama

et al. 2024

Preprint

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Garments engineered to emit far-infrared (FIR) spectral frequencies have potential conditioning benefits. This study aimed to explore the physiological effects of FIR-emitting clothes on sleep propensities involving thermoregulation and autonomic nervous function. In this double-blind, randomized, placebo-controlled, crossover study, fifteen healthy male participants (age 21.6 ± 1.5 years, body mass index 23.1 ± 1.9, Pittsburgh Sleep Quality Index 5.0 ± 2.0) wore a whole-body FIR garment (wavelength: 5–20 μm at 40°C), while a total body garment with the 100% polyester fiber without ceramic components was used as control for the intervention. To compare the physiological variables between the two electroencephalograms, the tympanic membrane temperature, sweating rate, skin temperature, and humidity were measured during sleep. Heart rate variability during sleep was also calculated. The percentage of rapid eye movement (REM) sleep was significantly higher in the FIR compared than in control (p= 0.027). We found a significant main effect of tympanic membrane temperature in time, equivalent to core body temperature. (2-way ANOVA; (F(26, 234)=4.046,p<0.001). Furthermore, the sweating rate was significantly lower when sleeping with FIR predominantly in the final phase of sleep (garment × time interaction (F(26,572)=55.05,p<0.001). Although there were no significant differences in skin surface temperature between the two garments, FIR provided significantly lower skin humidity during the middle of night sleep compared with the control. Regarding LF, a significant garment type x time interaction (F(1.87, 48.57)=3.36,p=0.046). Post-hoc analysis revealed that the LF value of FIR was higher in the final phase of sleep than that of control (p=0.027). Then present results suggest that sleeping with FIR in comparison to with control, has a beneficial effect to facilitate restorative sleep, presumably involving proper thermoregulation.

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Section: Introductionmentioning

confidence: 99%

Physiological Evaluation of Far Infrared-Emitting Garments on Sleep and Thermoregulation

Nishida,

Nishii,

Suyama

et al. 2024

Preprint

Self Cite

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Effects of a 30-min rest with a nap chair on task performance, sleepiness, and neurophysiological measures in men with suspected brain fatigue: a randomized controlled crossover trial

Fujino,

Inoue,

Sonoda

et al. 2024

Front. Sleep

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BackgroundIt has been suggested that a short nap in the afternoon may improve sleepiness, alertness, and task performance. The present study evaluated the effects of a 30-min rest with a new nap chair on task performance, sleepiness, and neurophysiological measures.MethodsA randomized controlled crossover trial with a 1-week interval was carried out at the BOOCS Clinic Fukuoka in Japan. The subjects were male workers aged 20 to 64 years with suspected brain fatigue, which was defined by the Profile of Mood Status 2. The intervention was a 30-min rest with an office chair or a nap chair. The primary outcome was the performance in the Uchida-Kraepelin test. The secondary outcomes included the Karolinska Sleepiness Scale and 15-min heart rate variability (HRV). The changes after the nap-chair rest and office-chair rest were compared. Repeated measures analysis of variance with nesting was used in the statistical analysis.ResultsTwenty participants were eligible and entered the crossover trial. The overall 15-min score in the Uchida-Kraepelin test improved after the nap-chair rest and after the office-chair rest to almost the same extent (5.9 vs. 5.5 points, P = 0.68). The Karolinska Sleepiness score significantly decreased after the nap-chair rest, and the between-treatment difference in the decrease was highly significant (P = 0.0004). The average duration of sleep during rest was prominently longer in the nap-chair rest than in the office-chair rest (19.0 vs. 7.6 min, P = 0.002). No participants experienced REM sleep during the rest. LF and HF powers of the HRV were greater during the nap-chair rest than during the office-chair rest, the difference in the HF power being substantial.ConclusionA 30-min rest with the nap chair did not appreciably improve the performance in the Uchida-Kraepelin test as compared with the office-chair rest. The nap-chair rest induced a substantially longer sleep accompanied with a parasympathetic activation, thereby resulting in a material improvement in sleepiness after the rest.

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Effect of napping on a bean bag chair on sleep stage, muscle activity, and heart rate variability

Cited by 2 publications

References 46 publications

Physiological Evaluation of Far Infrared-Emitting Garments on Sleep and Thermoregulation

Physiological Evaluation of Far Infrared-Emitting Garments on Sleep and Thermoregulation

Effects of a 30-min rest with a nap chair on task performance, sleepiness, and neurophysiological measures in men with suspected brain fatigue: a randomized controlled crossover trial

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