Exercise Tolerance and Thermoregulatory Responses during Cycling in Boys and Men

Rowland, Thomas W.; Hagenbuch, Sean; Pober, David M.; Garrison, Anne

doi:10.1249/mss.0b013e31815a95a7

Cited by 55 publications

(35 citation statements)

References 19 publications

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“…It is known that any type of stress causes disruption of homeostasis and an imbalanced antioxidant status in several organs [9]. In this study we used cold as an acute stressing agent, considering that when exposed for long term (more than 1 month) it is observed an adaptation mechanism [10][11][12]. According to Janský et al [13], the chronic exposure to extreme low temperatures would not decrease cardiomyocytes nuclear size such as we found in our study due to the adjustment condition.…”

Section: Discussionmentioning

confidence: 99%

Efeitos do estresse pelo frio sobre o tamanho nuclear do cardiomiócito em ratos: avaliação por microscopia de luz

Meneghini

Ferreira²,

Abreu

et al. 2008

Rev Bras Cir Cardiovasc

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Efeitos do estresse pelo frio sobre o tamanho nuclear do cardiomiócito em ratos: avaliação por microscopia de luz AbstractIntroduction: Total body induced hypothermia and myocardial cooling are effective methods regarding myocardial protection during heart surgery and ischemia. It is described in previous studies that extreme low temperature exposure causes mitochondrial cristae and myofilament disarrangement in cardiomyocytes, however, no investigation has analyzed the effects of cold stress on nuclear size of cardiomyocytes.Objectives: To evaluate the effects of acute cold stress exposure on the nuclear size of cardiomyocytes in rats.Methods: The experimental study procedures were 531MENEGHINI, A ET AL -Efeitos do estresse pelo frio sobre o tamanho nuclear do cardiomiócito em ratos: avaliação por microscopia de luz Rev Bras Cir Cardiovasc 2008; 23(4): 530-533

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Section: Discussionmentioning

confidence: 99%

Efeitos do estresse pelo frio sobre o tamanho nuclear do cardiomiócito em ratos: avaliação por microscopia de luz

Meneghini

Ferreira²,

Abreu

et al. 2008

Rev Bras Cir Cardiovasc

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“…Davies et al found that thermoregulation was identical when cycling to exhaustion in hot (∼31°C) or cold (∼19°C) controlled environments. 18 In a climate-controlled room, Cramer et al showed that changes in T co during 60 minutes of cycling at an exercise intensity eliciting 9.0 W·kg −1 of metabolic heat production T co , core body temperature; VO 2max , maximum oxygen uptake; VT1, first ventilatory threshold.…”

Section: Methodological Issuesmentioning

confidence: 99%

Thermoregulatory Response to Exercise After Exertional Heat Stroke

Sagui¹,

beighau²,

Jouvion

et al. 2017

Military Medicine

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Background: After one episode of exertional heat stroke (EHS), risk factors must be identified to determine the potential for subsequent episodes. One of these risk factors, core body temperature (T co ) kinetics during strenuous exercise, may be a surrogate marker suggestive of impaired thermoregulation. This study aimed to determine the kinetics of increases in T co among military subjects who had a history of EHS. Methods: Forty subjects (38 males, mean age 28.4 ± 4.9 years, mean body mass index 24.9 ± 2.4) who had a history of EHS ran 8 km in full combat gear with continuous monitoring of T co and heart rate. The run was a qualifying event for military service. T co was assessed using an ingestible sensor (Cortemp HQ Inc., Palmetto, Florida). Maximum oxygen uptake (VO 2max ) was measured on the day before the run. Findings: The mean performance time for the run was 44.6 ± 6.6 minutes achieved under mild climatic conditions. No neurological impairment was observed. The mean maximum T co was 39.9 ± 0.5°C. On the basis of T co during the last 10 minutes of running, two T co profiles were identified: increased T co (T co increase > 0.5°C) and plateaued T co . Neither profile depended on initial, mid-run, or maximal T co , VO 2max , speed running, body surface area or body fat mass. Discussion: Subjects who had a history of EHS exhibited different T co profiles at the end of an 8-km run. Laboratory studies will be necessary to identify the mechanisms underlying these profiles; future longitudinal studies can determine whether a T co increase >0.5°C during the last 10 minutes is a risk factor for EHS recurrence.

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“…However, more recent studies, in which tighter controls have been employed to match relative exercise intensities, fitness levels, environmental conditions and hydration status, indicate that children and adults have similar capacity to deal with thermal loads and exercisetolerance time during exercise in the heat (Inbar et al 2004;Rowland et al, 2008;Shibasaki et al, 1997). What is evident is that the mechanisms by which young individuals dissipate heat loads during exercise differ from those of adults (Falk & Dotan, 2008;Rowland, 2008).…”

Section: Fluid Recommendations For Adolescent Athletesmentioning

confidence: 99%

Sports Dietitians Australia Position Statement: Sports Nutrition for the Adolescent Athlete

Desbrow

McCormack

Burke³

et al. 2014

International Journal of Sport Nutrition and Exercise Metabolism

146

183

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It is the position of Sports Dietitians Australia (SDA) that adolescent athletes have unique nutritional requirements as a consequence of undertaking daily training and competition in addition to the demands of growth and development. As such, SDA established an expert multidisciplinary panel to undertake an independent review of the relevant scientific evidence and consulted with its professional members to develop sports nutrition recommendations for active and competitive adolescent athletes. The position of SDA is that dietary education and recommendations for these adolescent athletes should reinforce eating for long term health. More specifically, the adolescent athlete should be encouraged to moderate eating patterns to reflect daily exercise demands and provide a regular spread of high quality carbohydrate and protein sources over the day, especially in the period immediately after training. SDA recommends that consideration also be given to the dietary calcium, Vitamin D and iron intake of adolescent athletes due to the elevated risk of deficiency of these nutrients. To maintain optimal hydration, adolescent athletes should have access to fluids that are clean, cool and supplied in sufficient quantities before, during and after participation in sport. Finally, it is the position of SDA that nutrient needs should be met by core foods rather than supplements, as the recommendation of dietary supplements to developing athletes over-emphasizes their ability to manipulate performance in comparison with other training and dietary strategies.

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Exercise Tolerance and Thermoregulatory Responses during Cycling in Boys and Men

Abstract: This study failed to reveal differences in exercise tolerance, thermoregulatory adaptation, or cardiovascular response to exercise in the heat between euhydrated prepubertal boys and adult men.

Cited by 55 publications

References 19 publications

Efeitos do estresse pelo frio sobre o tamanho nuclear do cardiomiócito em ratos: avaliação por microscopia de luz

Efeitos do estresse pelo frio sobre o tamanho nuclear do cardiomiócito em ratos: avaliação por microscopia de luz

Thermoregulatory Response to Exercise After Exertional Heat Stroke

Sports Dietitians Australia Position Statement: Sports Nutrition for the Adolescent Athlete

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