Sweating responses during activation of the muscle metaboreflex in humans is altered by time of day

Aoki, Ken; Kondo, Narihiko; Shimomura, Yoshihiro; Yokoi, Mari; Iwanaga, Koichi; Harada, Hiroyuki; Katsuura, Tetsuo

doi:10.1046/j.0001-6772.2003.01222.x

Cited by 4 publications

(2 citation statements)

References 29 publications

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“…In the present study, T re and T es before heat stress were still significantly higher after BL conditions than following DL conditions, and T es thresholds for the onset of active vasodilation and sweating were also significantly higher with BL than with DL conditions (approximately 0.15°C). In earlier studies, the internal temperature thresholds for active cutaneous vasodilation and sweating correlated with the regular circadian rhythm in resting internal temperature, although showing larger diurnal or nocturnal fluctuations (0.3-0.5°C) (Wenger et al 1976;Stephenson et al 1984;Aoki et al 1997bAoki et al , 2001Aoki et al , 2004. Exposure to BL of 2800 lx through a single night in the present study narrowed the magnitude of the nocturnal fluctuations in internal temperature thresholds for thermoregulatory functions.…”

Section: Discussionmentioning

confidence: 40%

Modification of internal temperature regulation for cutaneous vasodilation and sweating by bright light exposure at night

et al. 2005

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Bright light (BL) exposure at night leads to suppressed secretion of melatonin and an attenuated fall in internal temperature at rest from the night to the early morning. However, it is unknown at the present whether typical diurnal variations in reflex responses to thermal challenges are similarly affected by BL exposure at night. We investigated the control of cutaneous vasodilator and sweating responses to hyperthermia in the early morning after artificial BL exposure at night, compare with dim light (DL) exposure. Six subjects stayed awake in a semi-supine position under DL (120 lx) or BL (2800 lx) conditions between 21.00 and 04.30 h. Urine samples were collected at 04.30 h. Beginning at 05.30 h, the lower legs were immersed for 50 min in 42 degrees C water. The subjects remained awake for 21 h until the end of hot water immersion. Urinary 6-sulphatoxymelatonin levels following BL were significantly lower than after DL. Oesophageal temperature (T es) before heating was significantly higher following BL [36.41+/-0.10 (DL) vs. 36.55+/-0.09 (BL) degrees C]. The T es thresholds for the onset of cutaneous vasodilation and sweating were significantly higher with BL than with DL conditions (approximately 0.15 degrees C, respectively). We found that the internal temperature threshold for thermoregulatory control of cutaneous vasodilation and sweating responses to passive heating in the early morning can be modified by the level of light exposure the prior night. Thus both basal internal temperature and the regulation of internal temperature are modified by BL exposure at night.

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Section: Discussionmentioning

confidence: 40%

Modification of internal temperature regulation for cutaneous vasodilation and sweating by bright light exposure at night

et al. 2005

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“…Isometric handgrip (IH) exercise followed by postexercise forearm occlusion has been used to evaluate sweating caused by integrated activations of the aforementioned non‐thermal factors and by the isolated activation of muscle metaboreceptors, respectively (Kondo et al., 1999; Shibasaki et al., 2001). Several studies have investigated sweating during IH exercise and muscle metaboreceptor stimulation in young, healthy adults (Amano et al., 2011, 2014, 2018; Aoki et al., 2004; Haqani et al., 2017; Kondo et al., 2000, 2003; Saad et al., 2001), prepubertal children (Amano et al., 2017) and elderly individuals (Amano et al., 2017) during light to severe heat stress conditions, and at rest (Amano et al., 2015; Binder et al., 2012), during (Amano et al., 2016) and after (McGinn et al., 2014; Paull et al., 2015) exercise. However, despite the accumulated knowledge in this research field, most studies have involved male participants, with only a few females.…”

Section: Introductionmentioning

confidence: 99%

Effects of sex and menstrual cycle on sweating during isometric handgrip exercise and postexercise forearm occlusion

Okamoto

Amano

2021

Experimental Physiology

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We investigated whether sex and menstrual cycle could modulate sweating during isometric handgrip (IH) exercise and muscle metaboreceptor stimulation. Twelve young, healthy women in the early follicular (EF) and mid-luteal (ML) phases and 14 men underwent two experimental sessions consisting of a 1.5 min IH exercise at 25 and 50% of maximal voluntary contraction (MVC) in a hot environment (35 • C, relative humidity 50%) followed by 2 min forearm occlusion to stimulate muscle metaboreceptors. Sweat rates, the number of activated sweat glands and the sweat output per gland (SGO) on the forearm and chest were assessed. Pilocarpine-induced sweating was also assessed via transdermal iontophoresis to compare the responses with those of IH exercise and muscle metaboreceptor stimulation, based on correlation analysis. Sweat rates on the forearm and chest during IH exercise and muscle metaboreceptor stimulation did not differ between men and women in either menstrual cycle phase (all P ≥ 0.144). However, women in both phases showed lower SGO on the forearm and/or chest compared with men during IH exercise at 50% of MVC, with no differences in muscle metaboreceptor stimulation. Women in the ML phase had a lower forearm sweat rate during IH exercise at 50% of MVC (P = 0.015) and SGO during exercise and muscle metaboreceptor stimulation (main effect, both P ≤ 0.003) compared with those in the EF phase. Overall, sweat rate and SGO during IH exercise and muscle metaboreceptor stimulation were correlated with pilocarpine-induced responses (all P ≤ 0.064, r ≥ 0.303). We showed that sex and menstrual cycle modulate sudomotor activity during IH exercise and/or muscle metaboreceptor stimulation. Cholinergic sweat gland sensitivity might explain, in part, the individual variation of the response.

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Human Core Temperature Responses during Exercise and Subsequent Recovery: An Important Interaction between Diurnal Variation and Measurement Site

Morris

Atkinson

Drust

et al. 2009

Chronobiology International

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Chronobiological investigations into core temperature during and after exercise can involve ambulatory measurements of intestinal temperature during actual competitions, esophageal temperature measurements in laboratory simulations, or rectal temperature, which can be measured in both the field and laboratory. These sites have yet to be compared during both morning and afternoon exercise and subsequent recovery. At 08:00 and 17:00 h, seven recreationally active males exercised at 70% peak oxygen uptake for 30 min and then recovered passively for 30 min. During the experiment, esophageal, rectal, intestinal, and skin temperatures, plus sweat loss, heart rate, and ratings of perceived exertion (RPE), were monitored. We found that the diurnal variation in intestinal temperature responses (0.45+/-0.32 degrees C; mean+/-SD) was significantly larger compared with rectal (0.33+/-0.24 degrees C) and, particularly, esophageal temperature responses (0.21+/-0.20 degrees C; p= 0.019). This reflected a greater difference of 0.25-0.40 degrees C between the esophagus and the other two sites in the afternoon, compared to inter-site differences of only 0.13-0.16 degrees C in the morning. Diurnal variation was small for skin temperature, heart rate, sweat loss, and RPE responses during exercise (p>0.05). Our data suggest that the relative differences between intestinal, rectal, and esophageal temperature during exercise and subsequent recovery depend on time of day to the extent that inferences from studies on experimental and applied chronobiology will be affected.

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Sweating responses during activation of the muscle metaboreflex in humans is altered by time of day

Abstract: We conclude that under mild hyperthermic conditions, the sweating response in non-glabrous skin to activation of the muscle metaboreflex exhibits a time-of-day effect.

Cited by 4 publications

References 29 publications

Modification of internal temperature regulation for cutaneous vasodilation and sweating by bright light exposure at night

Modification of internal temperature regulation for cutaneous vasodilation and sweating by bright light exposure at night

Effects of sex and menstrual cycle on sweating during isometric handgrip exercise and postexercise forearm occlusion

Human Core Temperature Responses during Exercise and Subsequent Recovery: An Important Interaction between Diurnal Variation and Measurement Site

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