Sleep patterns of European expatriates in a dry tropical climate

Montmayeur, Alain; Buguet, Alain

doi:10.1111/j.1365-2869.1992.tb00037.x

Cited by 19 publications

(16 citation statements)

References 13 publications

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“…During baseline recordings, the high amounts of SWS in both seasons confirm previous findings in Niger (5,8,15) and in subjects exposed to short-term passive heating (11) or after exercise (9,10). REM sleep was also high in both seasons, unseen in obviously more stressful short-term laboratory heat exposure studies (12).…”

Section: Discussionsupporting

confidence: 89%

Exercise and Sleep in Four African Sportsmen Living in the Sahel

Montmayeur¹,

Buguet²,

Sollin³

et al. 1994

Int J Sports Med

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During both the cool and hot periods of the dry season of the Sahelian climate, sleep patterns of four African sportsmen from Niger (23 +/- 0.8 years old) were studied after square-wave cycle ergometer exercise. The sleep patterns were studied in the sedentary (Baseline) condition and under two exercise conditions, with and without rehydration. All conditions were randomly assigned. The exercise programme consisted of 3 sequences of cycling, beginning with 10 min at 30% of maximal aerobic power (MAP), followed by an exhaustive supramaximal effort (130% of MAP), and ending with a 10 min recovery at 30% of MAP. Polysomnography was recorded for 2 consecutive nights in each condition. One adaptation night, to familiarize the subjects to the polysomnography protocol, preceded the first session. Baseline slow-wave sleep (SWS) and REM sleep were high. In the hot season, there was an overall increase in SWS (p < 0.02), due primarily to an increase in Stage 4 (p < 0.01). Stage 2 sleep decreased (p < 0.01). This effect was also observed after exercise with rehydration, but was absent in the non-hydration condition. This distinction between the rehydrated and non-rehydrated condition is thought to be due to the greater stress which may accompany an exercise-induced relative dehydration. REM sleep decreased after exercise in the cool season (p < 0.001), but equalled baseline levels during the hot season. The results suggest a combined action of hyperthermia, water balance and stress, and are further supportive of an underlying hypothalamic control of human sleep.

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Section: Discussionsupporting

confidence: 89%

Exercise and Sleep in Four African Sportsmen Living in the Sahel

Montmayeur¹,

Buguet²,

Sollin³

et al. 1994

Int J Sports Med

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“…Night sleep changes were thus regarded as diachronic. Sleep patterns differed from those encountered in temperate climates, either in African volunteers [18,19] or in European expatriates [20]. The elevated amounts of SWS in the cool season (25.6 ± 1.7% of total sleep time in the Africans, 20.4% in the Caucasians) increased in the hot season (33.0 ± 2.3% in the former, 30.4 ± 1.5% in the latter).…”

Section: Long-term Heat Acclimatization In People Living In Dry Tropimentioning

confidence: 77%

Sleep under extreme environments: Effects of heat and cold exposure, altitude, hyperbaric pressure and microgravity in space

Buguet

2007

Journal of the Neurological Sciences

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“…Conversely, in African countries where seasonal variation in photoperiod is limited due to proximity to the equator, studies of college students suggest no seasonality in sleep patterns [15,16]. In addition, Caucasians who relocate to Africa demonstrate a nonseasonal sleep pattern similar to the native African population [17].…”

Section: Introductionmentioning

confidence: 99%

Seasonal Changes in Sleep Duration in African American and African College Students Living In Washington, D.C.

Volkov

Rohan

Yousufi

et al. 2007

The Scientific World JOURNAL

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Duration of nocturnal melatonin secretion, a marker of “biological night” that relates to sleep duration, is longer in winter than in summer in patients with seasonal affective disorder (SAD), but not in healthy controls. In this study of African and African American college students, we hypothesized that students who met criteria for winter SAD or subsyndromal SAD (S-SAD) would report sleeping longer in winter than in summer. In addition, based on our previous observation that Africans report more “problems” with change in seasons than African Americans, we expected that the seasonal changes in sleep duration would be greater in African students than in African American students. Based on Seasonal Pattern Assessment Questionnaire (SPAQ) responses, African American and African college students in Washington, D.C. (N = 575) were grouped into a winter SAD/S-SAD group or a no winter diagnosis group, and winter and summer sleep length were determined. We conducted a 2 (season) × 2 (sex) × 2 (ethnicity) × 2 (winter diagnosis group) ANCOVA on reported sleep duration, controlling for age. Contrary to our hypothesis, we found that African and African American students with winter SAD/S-SAD report sleeping longer in the summer than in the winter. No differences in seasonality of sleep were found between African and African American students. Students with winter SAD or S-SAD may need to sacrifice sleep duration in the winter, when their academic functioning/efficiency may be impaired by syndromal or subsyndromal depression, in order to meet seasonally increased academic demands.

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Sleep patterns of European expatriates in a dry tropical climate

Cited by 19 publications

References 13 publications

Exercise and Sleep in Four African Sportsmen Living in the Sahel

Exercise and Sleep in Four African Sportsmen Living in the Sahel

Sleep under extreme environments: Effects of heat and cold exposure, altitude, hyperbaric pressure and microgravity in space

Seasonal Changes in Sleep Duration in African American and African College Students Living In Washington, D.C.

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