Determinants of body core temperatures at fatigue in rats subjected to incremental-speed exercise: The prominent roles of ambient temperature, distance traveled, initial core temperature, and measurement site

被引：5

作者：

Andrade, Marcelo T. T. ^{[1
]}

Barbosa, Nicolas H. S. ^{[1
]}

Souza-Junior, Roberto C. S. ^{[1
]}

Fonseca, Cletiana G. G. ^{[1
]}

Damasceno, William C. C. ^{[1
]}

Regina-Oliveira, Kassya ^{[1
]}

Drummond, Lucas R. R. ^{[1
,2
]}

Bittencourt, Myla A. A. ^{[1
]}

Kunstetter, Ana C. C. ^{[1
]}

Andrade, Pedro V. R. ^{[1
]}

Hudson, Alexandre S. R. ^{[1
]}

Paula, Pedro H. H. ^{[1
]}

Teixeira-Coelho, Francisco ^{[1
,3
]}

Coimbra, Candido C. ^{[4
]}

Pires, Washington ^{[1
,5
]}

Wanner, Samuel P. P. ^{[1
]}

机构：

[1] Univ Fed Minas Gerais, Sch Phys Educ Physiotherapy & Occupat Therapy, Exercise Physiol Lab, Ave Antonio Carlos 6627, BR-31270901 Belo Horizonte, MG, Brazil

[2] Univ Estado Minas Gerais, Dept Phys Educ, Unidade Divinopolis, Divinopolis, MG, Brazil

[3] Univ Fed Triangulo Mineiro, Inst Hlth Sci, Dept Sport Sci, Uberaba, MG, Brazil

[4] Univ Fed Minas Gerais, Inst Biol Sci, Lab Endocrinol & Metab, Belo Horizonte, MG, Brazil

[5] Univ Fed Ouro Preto, Sch Phys Educ, Phys Act Lab, Ouro Preto, MG, Brazil

来源：

INTERNATIONAL JOURNAL OF BIOMETEOROLOGY | 2023年 / 67卷 / 05期

关键词：

Brain; Environment; Heat; Hyperthermia; Performance; Physical exercise; Regression analysis; Temperature; Thermoregulation; TAIL HEAT-LOSS; PROLONGED EXERCISE; BLOOD-FLOW; ABDOMINAL TEMPERATURES; BRAIN TEMPERATURE; THERMOREGULATION; CHOLINOCEPTORS; HYPERTHERMIA; PERFORMANCE; INCREASES;

D O I：

10.1007/s00484-023-02453-z

中图分类号：

Q6 [生物物理学];

学科分类号：

071011 ;

摘要：

Understanding the factors that underlie the physical exercise-induced increase in body core temperature (T-CORE) is essential to developing strategies to counteract hyperthermic fatigue and reduce the risk of exertional heatstroke. This study analyzed the contribution of six factors to T-CORE attained at fatigue in Wistar rats (n = 218) subjected to incremental-speed treadmill running: ambient temperature (T-AMB), distance traveled, initial T-CORE, body mass, measurement site, and heat loss index (HLI). First, we ran hierarchical multiple linear regression analyses with data from different studies conducted in our laboratory (n = 353 recordings). We observed that T-AMB, distance traveled, initial T-CORE, and measurement site were the variables with predictive power. Next, regression analyses were conducted with data for each of the following T-CORE indices: abdominal (T-ABD), brain cortex (T-BRAIN), or colonic (T-COL) temperature. Our findings indicated that T-AMB, distance traveled (i.e., an exercise performance-related variable), initial T-CORE, and HLI predicted the three T-CORE indices at fatigue. Most intriguingly, HLI was inversely related to T-ABD and T-BRAIN but positively associated with T-COL. Lastly, we compared the temperature values at fatigue among these T-CORE indices, and the following descendent order was noticed - T-COL, T-ABD, and T-BRAIN - irrespective of T-AMB where experiments were conducted. In conclusion, T-CORE in rats exercised to fatigue depends primarily on environmental conditions, performance, pre-exercise T-CORE, and measurement site. Moreover, the influence of cutaneous heat loss on T-COL is qualitatively different from the influence on T-ABD and T-BRAIN, and the temperature values at fatigue are not homogenous within the body core.

引用

页码：761 / 775

页数：15

共 70 条

[1]

Andrade Marcelo T, 2023, Temperature (Austin), V10, P287, DOI 10.1080/23328940.2022.2115274

[2] Reliability of physical performance and thermoregulatory parameters in rats subjected to incremental treadmill running [J].