Cold-induced bradycardia in man during sleep in Arctic winter nights

Buguet, Alain

doi:10.1007/bf02192832

Cited by 5 publications

(3 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Indeed, the cold caused a transient fall in heart rate upon chamber entrance most attributable to a cold-induced bradycardic response due to a periphery to core blood flow redistribution. 43,44 Even as heart rate and core body temperature increased due to the exercise demands, there was no additive increase in skin conductivity due to capsaicin. This finding was confirmed by minimal decreases in body weight and, thus, sweat loss.…”

Section: Discussionmentioning

confidence: 99%

Impact of Topical Capsaicin Cream on Thermoregulation and Perception While Walking in the Cold

Rosales,

Moler,

Engellant

et al. 2024

Wilderness & Environmental Medicine

View full text Add to dashboard Cite

Introduction Capsaicin, a chili pepper extract, can stimulate increased skin blood flow (SkBF) with a perceived warming sensation on application areas. Larger surface area application may exert a more systemic thermoregulatory response. Capsaicin could assist with maintaining heat transport to the distal extremities, minimizing cold weather injury risk. However, the thermoregulatory and perceptual impact of topical capsaicin cream application prior to exercise in the cold is unknown. Methods Following application of either a 0.1% capsaicin or control cream to the upper and lower extremities (10 g total, ∼40–50% body surface area), 11 participants in shorts and a t-shirt were exposed to 30 min of cold (0 °C, 40% relative humidity). Exposures comprised of 5 min seated rest, 20 min walking (1.6 m·s−1, 5% grade), and 5 min seated rest. Temperature (skin, core), SkBF, skin conductivity, heart rate, thermal sensation, and thermal comfort were measured throughout. Results The capsaicin treatment did not differ from the control treatment in skin temperature (treatment mean: 30.0 ± 2.5, 30.1 ± 2.4 °C, respectively, p = 0.655), core temperature (treatment mean: 37.3 ± 0.5, 37.4 ± 0.4 °C, respectively, p = 0.113), SkBF (treatment mean: −8.4 ± 10.0, −11.1 ± 10.7 A.U., respectively, p = 0.492), skin conductivity (treatment mean: −0.7 ± 5.1, 0.4 ± 6.4 µS, respectively, p = 0.651), or heart rate (treatment mean: 83 ± 29, 85 ± 28 beats·minute−1, respectively, p = 0.234). The capsaicin and control treatments also did not differ in thermal sensation ( p = 0.521) and thermal comfort ( p = 0.982), with perceptual outcomes corresponding with feeling “cool” and “just uncomfortable,” respectively. Conclusions 0.1% topical capsaicin application to exposed limbs prior to walking in a cold environment does not alter whole-body thermoregulation or thermal perception.

show abstract

Section: Discussionmentioning

confidence: 99%

Impact of Topical Capsaicin Cream on Thermoregulation and Perception While Walking in the Cold

Rosales,

Moler,

Engellant

et al. 2024

Wilderness & Environmental Medicine

View full text Add to dashboard Cite

show abstract

“…On the other hand, the parasympathetic activity decreases and the sympathetic activity increases during REM (Somers et al 1993; Van de Borne et al 1994;Trinder et al 2001;Burgess et al 2004;Valladares et al 2008;Okamoto-Mizuno et al 2008). Cold exposure during sleep resulted in cold-induced bradycardia that lasted as long as the subject was exposed to ambient cold (Buguet 1987). In wakeful subjects, cold exposure resulted in bradycardia and decreased cardiac output, increased stroke volume and arterial blood pressure (Fagious and Kay 1991), and increased parasympathetic activity and decreased sympathetic activity (Kinugasa and Hirayanagi 1999).…”

Section: Introductionmentioning

confidence: 97%

“…However, heart rate was only measured in the previous study (Buguet 1987); therefore the eVects on cardiac autonomic activity are not well understood. The aim of this study was to examine the eVect of cold exposure during sleep on cardiac autonomic activity using the index of heart rate variability (HRV), which is a reliable non-invasive indicator of cardiac autonomic activity.…”

Section: Introductionmentioning

confidence: 99%

Effects of low ambient temperature on heart rate variability during sleep in humans

et al. 2008

View full text Add to dashboard Cite

The effects of cold exposure on heart rate variability (HRV) during sleep were examined. Eight male subjects slept under three different conditions: 3 degrees C, 50-80% relative humidity (RH) [3]; 10 degrees C, 50% RH [10]; and 17 degrees C 50% RH [17]. No significant differences were observed in HRV during rapid eye movement sleep (REM) and wakefulness. The ratio of the low frequency (LF) to high frequency component (HF) of HRV (LF/HF) significantly differed among the conditions during stage 2 and slow wave sleep (SWS) that decreased as the ambient temperature decreased. The normalized LF [LF/(LF + HF)] significantly decreased in 3 and 10 than in 17 during SWS. In low ambient temperature, predominant cardiac parasympathetic activity during stage 2 with no significant difference during REM and wakefulness may cause variations in HRV at transition from stage 2 to REM and wakefulness. These results may partly explain the peak in adverse cardiac events during winter.

show abstract

Thermal changes observed before and after J.-L. Etienne's journey to the North Pole

Bittel

Livecchi-Gonnot

Hanniquet

et al. 1989

Europ. J. Appl. Physiol.

View full text Add to dashboard Cite

The thermoregulatory responses of a French doctor, Jean-Louis Etienne, were examined in a standard cold test before and after his journey to the North Pole, to investigate whether general and/or local cold adaptation had occurred. The two tests were carried out in a climatic chamber for 2 h at rest (dry bulb temperature, 1 degree C; relative humidity, 40%; wind speed, 0.8 m.s-1). After his journey, Etienne showed a general hypothermic-hypometabolic adaptation, i.e. a decrease in rectal temperature (Tre) and metabolic heat production (M), and an increased local skin temperature of the extremities. Between the two tests, a change occurred in the relationship between tympanic temperature (Tty) and M. During the post-journey cold test, Tty [as representative of the central nervous system (CNS) temperature] increased while the decrease in Tre was accelerated, probably due to a redistribution of blood volume towards the CNS. Such a mechanism would protect the central core with special reference to the CNS.

show abstract

Cold-induced bradycardia in man during sleep in Arctic winter nights

Cited by 5 publications

References 16 publications

Impact of Topical Capsaicin Cream on Thermoregulation and Perception While Walking in the Cold

Impact of Topical Capsaicin Cream on Thermoregulation and Perception While Walking in the Cold

Effects of low ambient temperature on heart rate variability during sleep in humans

Thermal changes observed before and after J.-L. Etienne's journey to the North Pole

Contact Info

Product

Resources

About