Spicy meal disturbs sleep: an effect of thermoregulation?

Edwards, Susan; Montgomery, Iain; Colquhoun, Eric Q.; Jordan, Jo; Clark, Michael G.

doi:10.1016/0167-8760(92)90048-g

Cited by 33 publications

(14 citation statements)

References 13 publications

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“…The increase in sleep latency during Ramadan is consistent with the findings that evening meals improve alertness at bed‐time (Smith et al. 1994) and that sleep onset is delayed when body temperature is increased by nutritional factors such as spicy nocturnal meals (Edwards et al. 1992).…”

Section: Discussionsupporting

confidence: 84%

Sleep during Ramadan intermittent fasting

Roky¹,

Chapotot

Hakkou³

et al. 2001

Journal of Sleep Research

164

131

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During the month of Ramadan intermittent fasting, Muslims eat exclusively between sunset and sunrise, which may affect nocturnal sleep. The effects of Ramadan on sleep and rectal temperature (Tre) were examined in eight healthy young male subjects who reported at the laboratory on four occasions: (i) baseline 15 days before Ramadan (BL); (ii) on the eleventh day of Ramadan (beginning of Ramadan, BR); (iii) on the twenty‐fifth day of Ramadan (end of Ramadan, ER); and (iv) 2 weeks after Ramadan (AR). Although each session was preceded by an adaptation night, data from the first night were discarded. Polysomnography was taken on ambulatory 8‐channel Oxford Medilog MR‐9000 II® recorders. Standard electroencephalogram (EEG), electro‐oculogram (EOG) and electromyogram (EMG) recordings were scored visually with the PhiTools ERA© software. The main finding of the study was that during Ramadan sleep latency is increased and sleep architecture modified. Sleep period time and total sleep time decreased in BR and ER. The proportion of non‐rapid eye movement (NREM) sleep increased during Ramadan and its structure changed, with an increase in stage 2 proportion and a decrease in slow wave sleep (SWS) duration. Rapid eye movement (REM) sleep duration and proportion decreased during Ramadan. These changes in sleep parameters were associated with a delay in the occurrence of the acrophase of Tre and an increase in nocturnal Tre during Ramadan. However, the 24‐h mean value (mesor) of Tre did not vary. The nocturnal elevation of Tre was related to a 2–3‐h delay in the acrophase of the circadian rhythm. The amplitude of the circadian rhythm of Tre was decreased during Ramadan. The effects of Ramadan fasting on nocturnal sleep, with an increase in sleep latency and a decrease in SWS and REM sleep, and changes in Tre, were attributed to the inversion of drinking and meal schedule, rather than to an altered energy intake which was preserved in this study.

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Section: Discussionsupporting

confidence: 84%

Sleep during Ramadan intermittent fasting

Roky¹,

Chapotot

Hakkou³

et al. 2001

Journal of Sleep Research

164

131

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“…Two studies (E32) have not shown any changes in oxygen consumption, fat utilisation or body temperature. [16][17] However, different concentrations of capsaicin in various types of foods may affect research outcomes. IS There is no evidence that capsaicin exerts a thermogenic effect as a supplement.…”

Section: L-carnitinementioning

confidence: 99%

The effectiveness of popular, non‐prescription weight loss supplements

Egger

Cameron‐Smith

Stanton

1999

Medical Journal of Australia

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Objectives To review the evidence for the effectiveness of popular, non‐prescription weight loss supplements. Data sources A detailed literature search including all relevant medical and supplementary medicine databases and evidence submitted from manufacturers. Data synthesis The theoretical basis and rationale for the use of each substance is considered along with available research in the published literature on effectiveness and potential risks. We classified the level of evidence represented by the main research studies on each substance. Conclusions There is no good evidence for any weight loss benefits from most of the substances reviewed here. There is some support for mild effects of capsaicin, caffeine and fibre, but only in whole foods. In some cases (eg, chitosan), there is a plausible theoretical basis for the product, but no supporting proof of effect in humans in the absence of a calorie‐controlled diet. Possible synergistic effects of different ingredients cannot be dismissed, but cannot be assessed from current data. There is an absence of good quality research on many substances, which means that advertising claims may be misleading.

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“…Two predominant mechanisms have been attributed to capsaicininduced hypothermia; one mechanism induces substance P and calcitonin gene-related peptide release (Jhamandas et al, 1984;Holzer, 1991;Gavva et al, 2005), which results in vasodilation in the periphery and therefore increases heat loss, and the second mechanism reduces metabolism (as measured by reduction in the oxygen consumption), which lowers heat production (Hori, 1984). In another experiment, six young healthy men who ate Tabasco hot sauce with dinner had an elevated body temperature during the first sleep cycle, making it harder for them to fall asleep and to sleep well (Edwards et al, 1992). These reports suggest the significant effect of capsaicin on body temperature regulation.…”

Section: Impact On Body Temperature Regulationmentioning

confidence: 95%