Relationship between ventilatory response and body temperature during prolonged submaximal exercise

Hayashi, Keiji; Honda, Yasushi; Ogawa, Takeshi; Kondo, Narihiko; Nishiyasu, Takeshi

doi:10.1152/japplphysiol.00541.2005

Cited by 80 publications

(120 citation statements)

References 40 publications

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“…The results of the study Saunders et al 15 an increase in BT at a relative humidity of 80% compared with 59% relative humidity to nine subjects after cycling for two hours. This statement was in accordance with the results of research Yashasi et al 16 physical exercise at high relative humidity causes the core body temperature was higher than the low relative humidity.…”

supporting

confidence: 93%

Relative Humidity of 40% Inhibiting the Increase of Pulse Rate, Body Temperature, and Blood Lactic Acid During Exercise

2016

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Background: Excessive sweating of the body is a reaction to decrease the heat caused by prolonged exercise at high relative humidity (RH). This situation may cause an increase in pulse rate (PR), body temperature (BT), and blood lactic acid (BLA) workout. Objective: This study aimed to prove that a RH of 40% better than a RH of 50% and 60% RH in inhibiting the increase of PR, BT, and BLA during exercise. Methods: The study was conducted on 54 samples randomly selected from the IKIP PGRI Bali students. The samples were divided into three groups, and each group was given cycling exercise with a load of 80 Watt for 2 x 30 minutes with rest between sets for five minutes. Group-1 of cycling at 40% of RH, Group-2 at a RH of 50%, and the Group-3 at a RH of 60%. Data PR, BT, and BLA taken before and during exercise.The mean difference between groups before and during exercise were analyzed by One-way Anova and a further test used Least Significant Difference (LSD). Significance used was α = 0.05. Results: The mean of PR during exercise was significantly different between groups with p = 0.045, the mean of BT during exercises was significantly different between groups with p = 0.006, and the mean of BLA during exercises was significantly different between groups with p = 0.005 (p <0.05). Also found that PR, BT, and BLA during exercise at 40% RH was lower than 50% RH and 60% RH (p <0.05). Conclusion: Thus, the RH of 40% was better than RH of 50% and 60 % in inhibiting the increase of PR, BT, and BLA during exercise. Therefore, when practiced in a closed room is expected at 40% relative humidity.Keywords: relative humidity, pulse rate, body temperature, blood lactic acid. Cite This Article: Sandi, N., Pangkahila, A., Adiatmika, P.2016. Relative humidity of 40% inhibiting the increase of pulse rate, body temperature, and blood lactic acid during exercise.

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confidence: 93%

Relative Humidity of 40% Inhibiting the Increase of Pulse Rate, Body Temperature, and Blood Lactic Acid During Exercise

2016

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“…We (10,16) and others (32) have shown that when V E is plotted against core temperature, it increases linearly as core temperature rises from 37.0°C to 40.0°C during exercise at a constant workload, i.e., there is no critical threshold for hyperventilation. In our earlier studies, however, we were unable to estimate the relationship between core temperature and V E below 37°C because by the time V E reached a steady state, after ϳ5 min of exercise, core temperature had already reached 37°C (10,16). On the other hand, a core temperature threshold for hyperventilation has been shown to exist during incremental exercise (37,43).…”

mentioning

confidence: 87%

“…Above this threshold, ventilation increases linearly in proportion to increasing core temperature with minimal change in oxygen consumption (5,10). As in resting subjects, metabolic factors contribute minimally to ventilation during prolonged submaximal exercise at a constant workload in the heat (16); under those conditions core temperature rises steadily, whereas minute ventilation (V E) also increases gradually with time (10,16,32). We (10,16) and others (32) have shown that when V E is plotted against core temperature, it increases linearly as core temperature rises from 37.0°C to 40.0°C during exercise at a constant workload, i.e., there is no critical threshold for hyperventilation.…”

mentioning

confidence: 99%

“…As in resting subjects, metabolic factors contribute minimally to ventilation during prolonged submaximal exercise at a constant workload in the heat (16); under those conditions core temperature rises steadily, whereas minute ventilation (V E) also increases gradually with time (10,16,32). We (10,16) and others (32) have shown that when V E is plotted against core temperature, it increases linearly as core temperature rises from 37.0°C to 40.0°C during exercise at a constant workload, i.e., there is no critical threshold for hyperventilation. In our earlier studies, however, we were unable to estimate the relationship between core temperature and V E below 37°C because by the time V E reached a steady state, after ϳ5 min of exercise, core temperature had already reached 37°C (10,16).…”

mentioning

confidence: 99%

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Effect of initial core temperature on hyperthermic hyperventilation during prolonged submaximal exercise in the heat

Tsuji

Honda

Fujii

et al. 2012

American Journal of Physiology-Regulatory, Integrative and Comp

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Nishiyasu T. Effect of initial core temperature on hyperthermic hyperventilation during prolonged submaximal exercise in the heat. Am J Physiol Regul Integr Comp Physiol 302: R94 -R102, 2012. First published September 28, 2011 doi:10.1152/ajpregu.00048.2011.-We investigated whether a core temperature threshold for hyperthermic hyperventilation is seen during prolonged submaximal exercise in the heat when core temperature before the exercise is reduced and whether the evoked hyperventilatory response is affected by altering the initial core temperature. Ten male subjects performed three exercise trials at 50% of peak oxygen uptake in the heat (37°C and 50% relative humidity) after altering their initial esophageal temperature (Tes). Initial Tes was manipulated by immersion for 25 min in water at 18°C (Precooling), 35°C (Control), or 40°C (Preheating). Tes after the water immersion was significantly higher in the Preheating trial (37.5 Ϯ 0.3°C) and lower in the Precooling trial (36.1 Ϯ 0.3°C) than in the Control trial (36.9 Ϯ 0.3°C). In the Precooling trial, minute ventilation (V E) showed little change until Tes reached 37.1 Ϯ 0.4°C. Above this core temperature threshold, V E increased linearly in proportion to increasing Tes. In the Control trial, V E increased as Tes increased from 37.0°C to 38.6°C after the onset of exercise. In the Preheating trial, V E increased from the initially elevated levels of Tes (from 37.6 to 38.6°C) and V E. The sensitivity of V E to increasing Tes above the threshold for hyperventilation (the slope of the Tes-V E relation) did not significantly vary across trials (Precooling trial ϭ 10.6 Ϯ 5.9, Control trial ϭ 8.7 Ϯ 5.1, and Preheating trial ϭ 9.2 Ϯ 6.9 L·min Ϫ1 ·°C Ϫ1 ). These results suggest that during prolonged submaximal exercise at a constant workload in humans, there is a clear core temperature threshold for hyperthermic hyperventilation and that the evoked hyperventilatory response is unaffected by altering initial core temperature.hyperpnea; hyperthermia; thermoregulation; precooling; preheating WHEN HUMANS ARE EXPOSED TO a hot environment, heat dissipation through cutaneous vasodilation and sweating increases in response to rising body core and skin temperatures. In addition to these thermoregulatory responses, Haldane found in 1905 that an increase in ventilation is also induced by a rise in body core temperature (13). Since that early report, many studies have confirmed the existence of hyperthermia-induced hyperventilation (5, 9 -11, 16, 26, 32, 38, 43) although its characteristic and significance remain unclear.When ventilation is expressed as a function of core temperature in passively-heated humans at rest, there is no significant change until core temperature reaches a temperature threshold for hyperventilation, ϳ37.8 -38.5°C. Above this threshold, ventilation increases linearly in proportion to increasing core temperature with minimal change in oxygen consumption (5, 10). As in resting subjects, metabolic factors contribute minimally to ventilation during prolo...

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“…Os maiores valores encontrados nos primeiros minutos da recuperação comparados ao repouso são esperados, visto que estímulos físicos e químicos que ocorrem com o exercício, como a diminuição do pH e o aumento da temperatura, promovem a elevação da frequência respiratória (HAYASHI et al, 2006).…”

Section: Discussionunclassified

Efeitos da reposição hidroeletrolítica sobre parâmetros cardiorrespiratórios em exercício e recuperação

Moreno

Pastre

Papoti

et al. 2012

Motriz: rev. educ. fis.

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Resumo: Introdução: a necessidade de reposição ao máximo das perdas hídricas tornou-se estabelecida e difundida nos consensos internacionais. Entretanto, permanece pouco compreendida a influência da reposição quando administrada, igualmente, durante e após o exercício sobre parâmetros cardiorrespiratórios. Objetivo: analisar os efeitos da reposição hidroeletrolítica na frequência cardíaca (FC), pressão arterial sistólica (PAS), pressão arterial diastólica (PAD), saturação parcial de oxigênio (SpO 2 ) e frequência respiratória (f) de jovens durante e após um exercício de longa duração. Métodos: 31 jovens (21,55 ± 1,89 anos) realizaram três visitas ao laboratório (intervalo de 48 horas entre elas), sendo na primeira aplicado um teste incremental, para determinação da carga utilizada nas visitas seguintes, e nas duas últimas, denominadas protocolo controle (PC) e protocolo experimental (PE), os sujeitos foram submetidos a 10 min de repouso supino, 90 min de exercício em esteira ergométrica (60% do VO 2pico ) e 60 min de repouso supino. No PC não houve hidratação e no PE houve ingestão de solução isotônica. Os parâmetros FC, PAS, PAD, SpO 2 e f foram mensurados no final do repouso; nos minutos 30, 60 e 90 do exercício, com exceção da f; e nos minutos 1, 3, 5, 7, 10, 20, 30, 40, 50 e 60 pós-exercício. Foi aplicado o teste t de Student ou teste de Mann-Whitney e ANOVA para medidas repetidas ou teste de Friedman seguidos de testes post hoc, com p < 0,05. Resultados: a solução hidroeletrolítica proporcionou manutenção da PAS e da PAD, e menor incremento da FC durante o exercício; e promoveu retorno mais rápido da FC e conservou PAD, SpO 2 , PAS (a partir do 5º min) e f (a partir do 30º min) no período de recuperação. Conclusão: o protocolo de hidratação influenciou parâmetros cardiorrespiratórios de jovens durante e após a realização de atividade física submáxima de intensidade constante e longa duração. Palavras-chave: Exercício aeróbico. Soluções de reidratação. Frequência cardíaca. Pressão arterial. Frequência respiratória. Effects of fluid replacement on cardiorespiratory parameters in exercise and recoveryAbstract: Background: The replacement required of water waste is recognized and established in an international consensus. However, the influence of the replacement in cardiorespiratory parameters, especially when administered during and after physical activity, remains poorly understood. Objective: To analyze the effects of fluid replacement in heart rate (HR), systolic blood pressure (SBP), diastolic blood pressure (DBP), partial oxygen saturation (SpO2) and respiratory rate (f) of the youngsters during and after a long-term exercise. Methods: 31 individuals (21.55 ± 1.89 years old) performed three visits in the laboratory (48 hours among them), at first an incremental test was applied to determine the load used during subsequent visits. In the last two, called control protocol (CP) and the experimental protocol (EP), the subjects were undergone to a 10 min of supine rest, 90 min of treadmill exercise (60% of VO...

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Relationship between ventilatory response and body temperature during prolonged submaximal exercise

Cited by 80 publications

References 40 publications

Relative Humidity of 40% Inhibiting the Increase of Pulse Rate, Body Temperature, and Blood Lactic Acid During Exercise

Relative Humidity of 40% Inhibiting the Increase of Pulse Rate, Body Temperature, and Blood Lactic Acid During Exercise

Effect of initial core temperature on hyperthermic hyperventilation during prolonged submaximal exercise in the heat

Efeitos da reposição hidroeletrolítica sobre parâmetros cardiorrespiratórios em exercício e recuperação

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