Influence on Human Sleep Patterns of Lowering and Delaying the Minimum Core Body Temperature by Slow Changes in the Thermal Environment

Togo, Fumiharu; Aizawa, Seika; Arai, Junichi; Yoshikawa, Shoko; Ishiwata, Takayuki; Shephard, Roy J.; Aoyagi, Yukitoshi

doi:10.1093/sleep/30.6.797

Cited by 40 publications

(20 citation statements)

References 32 publications

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“…Such restriction of activity might induce a vicious circle of depression and insomnia. 16,17 Excluding days when precipitation is 31 mm and, thus, the main adverse effects of rainfall, our data 11 suggest that physical activity is influenced more strongly by day length and particularly mean ambient temperature than by duration of bright sunshine, mean wind speed or mean relative humidity. The daily step count peaks at a mean outdoor temperature of around 17°C; above and especially below this temperature, physical activity decreases in a quadratic fashion.…”

Section: Factors Affecting Habitual Physical Activity In the Elderlymentioning

confidence: 77%

“…We suggest that a count <4000 steps/day might provide a simple objective criterion that an elderly person has become housebound. Such restriction of activity might induce a vicious circle of depression and insomnia 16,17 . Excluding days when precipitation is ≥1 mm and, thus, the main adverse effects of rainfall, our data 11 suggest that physical activity is influenced more strongly by day length and particularly mean ambient temperature than by duration of bright sunshine, mean wind speed or mean relative humidity.…”

Section: Factors Affecting Habitual Physical Activity In the Elderlymentioning

confidence: 79%

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Habitual physical activity and health in the elderly: The Nakanojo Study

Aoyagi

Shephard

2010

Geriatrics Gerontology Int

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134

113

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This article provides a detailed overview of both factors influencing habitual physical activity, and relationships between such activity and health in the elderly. Current crosssectional data from the Nakanojo Study, which we have been carrying out since 2000, indicate substantial associations between the overall health of participants, and both the year-averaged daily step count and the year-averaged daily duration of effort undertaken at an intensity >3 metabolic equivalents (MET). In men, the extent of health is associated more closely with the daily duration of activity >3 MET than with the daily step count, whereas in women the association is closer for the step count than for the duration of activity >3 MET. In both sexes, the threshold amount of physical activity associated with better health is greater for physical than for mental benefits: >8000 vs >4000 steps/day and/or >20 vs >5 min/day at >3 MET, respectively. In other words, physical health is better in those spending at least 20 min/day in moderate walking (at a pace of around 1.4 m/s [5 km/h]) and a further >60 min of light activity per day. In contrast, better mental health is associated with much smaller amounts of deliberate physical activity. Both the intensity and the total volume of physical activity are influenced by meteorological factors, particularly precipitation and mean ambient temperature. Activity decreases exponentially to about 4000 steps/day as precipitation increases. Excluding the influence of rainfall, the daily step count peaks at a mean outdoor temperature of around 17°C; above and especially below such readings, physical activity decreases as a quadratic function of temperature. Seasonal changes in the microclimate should thus be considered when designing interventions intended to increase the habitual physical activity of older adults. Based on these findings, we are now developing preventive tactics that should contribute to health promotion, disease prevention and thus a reduction in medical expenses for elderly people.

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Section: Factors Affecting Habitual Physical Activity In the Elderlymentioning

confidence: 77%

Section: Factors Affecting Habitual Physical Activity In the Elderlymentioning

confidence: 79%

Habitual physical activity and health in the elderly: The Nakanojo Study

Aoyagi

Shephard

2010

Geriatrics Gerontology Int

Self Cite

134

113

View full text Add to dashboard Cite

show abstract

“…During REM sleep, forehead temperature and oxygen consumption increased and feet temperature decreased in comparison to SWS with cold exposure. 53 The thermal manipulation reduced not only leg skin temperature but also CBT and heart rate. When during sleep the ambient temperature is gradually decreased, an earlier CBT nadir and an advanced peak for REM sleep propensity was obtained.…”

Section: Changing Temperaturesmentioning

confidence: 99%

Body Temperature, Sleep, and Hibernation

Kräuchi¹,

Boer²

2011

Principles and Practice of Sleep Medicine

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“…The level of splicing of the circadian clock gene period is associated with this modulation [19, 20]. In humans, increased ambient temperatures correlate with decreases in REM [21], and optimal temperatures have been suggested to improve nighttime sleep [22]. Interestingly, thermoregulation has also been shown to influence human sleep patterns [23, 24]; people suffering from insomnia have aberrant core body temperature at bedtime compared to normal sleepers [25].…”

Section: Introductionmentioning

confidence: 99%

Reorganization of Sleep by Temperature in Drosophila Requires Light, the Homeostat, and the Circadian Clock

et al. 2016

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SUMMARY Increasing ambient temperature reorganizes the Drosophila sleep pattern in a way similar to the human response to heat, increasing daytime sleep while decreasing nighttime sleep. Mutation of core circadian genes blocks the immediate increase in daytime sleep, but not the heat-stimulated decrease in nighttime sleep, when animals are in a light:dark cycle. The ability of per01 flies to increase daytime sleep in light:dark can be rescued by expression of PER in either LNv or DN1p clock cells and does not require rescue of locomotor rhythms. Prolonged heat exposure engages the homeostat to maintain daytime sleep in the face of nighttime sleep loss. In constant darkness, all genotypes show an immediate decrease in sleep in response to temperature shift during the subjective day, implying that the absence of light input uncovers a clock-independent proarousal effect of increased temperature. Interestingly, the effects of temperature on nighttime sleep are blunted in constant darkness and in cryOUT mutants in light:dark, suggesting that they are dependent on the presence of light the previous day. In contrast, flies of all genotypes kept in constant light sleep more at all times of day in response to high temperature, indicating that the presence of light can invert the normal nighttime response to increased temperature. The effect of temperature on sleep thus reflects coordinated regulation by light, the homeostat, and components of the clock, allowing animals to reorganize sleep patterns in response to high temperature with rough preservation of the total amount of sleep.

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Influence on Human Sleep Patterns of Lowering and Delaying the Minimum Core Body Temperature by Slow Changes in the Thermal Environment

Abstract: Lowering the minimum and delaying the nadir of nocturnal Tc increases slow-wave sleep (probably by an increase of dry heat loss); use of this tactic might improve the overall quality of sleep.

Cited by 40 publications

References 32 publications

Habitual physical activity and health in the elderly: The Nakanojo Study

Habitual physical activity and health in the elderly: The Nakanojo Study

Body Temperature, Sleep, and Hibernation

Reorganization of Sleep by Temperature in Drosophila Requires Light, the Homeostat, and the Circadian Clock

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