Thermoregulatory and perceptual responses of lean and obese fit and unfit girls exercising in the heat

Rodrigues, Carolina de Ávila; Leites, Gabriela Tomedi; Meyer, Flávia

doi:10.1016/j.jped.2018.12.011

Cited by 5 publications

(4 citation statements)

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“…6 (a)). Subjects with higher BMI and fatter body are more likely to sweat [ 50 , 51 ] and have higher respiratory flow, resulting in a higher ΔW (see Fig. 6 (c)) and R f (see Fig.…”

Section: Resultsmentioning

confidence: 99%

Water-blocking Asphyxia of N95 Medical Respirator During Hot Environment Work Tasks With Whole-body Enclosed Anti-bioaerosol Suit

Zhu,

Jiang,

et al. 2023

Safety and Health at Work

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“…6 (a)). Subjects with higher BMI and fatter body are more likely to sweat [ 50 , 51 ] and have higher respiratory flow, resulting in a higher ΔW (see Fig. 6 (c)) and R f (see Fig.…”

Section: Resultsmentioning

confidence: 99%

Water-blocking Asphyxia of N95 Medical Respirator During Hot Environment Work Tasks With Whole-body Enclosed Anti-bioaerosol Suit

Zhu,

Jiang,

et al. 2023

Safety and Health at Work

View full text Add to dashboard Cite

“…The exercise protocol of this study elicited a greater H˙ prod than previous studies investigating thermoregulation during exercise in children (6,7,15). However, the environmental conditions (30°C, 40% RH) may not have been stressful enough to elicit meaningful differences in the ∆ T c between boys and girls.…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, VO 2peak is negatively associated with body fatness, such that higher VO 2peak individuals often have a lower body fat, which has been reported to result in a smaller ΔT c during exercise at a fixed H ˙prod per kilogram body mass because of differences in specific heat capacity of the body's tissues (14). A previous study in children found a similar ΔT c (~0.4°C) in fit (~50 mL•kg −1 •min −1 ) and unfit (~40 mL•kg −1 •min −1 ) girls cycling for two bouts of 25 min at a fixed H ˙prod (~5.4 W•kg −1 ) in the heat (36°C, 40% relative humidity [RH]) (15). However, the relatively low H ˙prod may not have been sufficient to induce increases in T c that were large enough to enable any fitness-related effect to be observed between participants.…”

mentioning

confidence: 90%

Biological Sex Does Not Influence Core Temperature Change and Sweating of Children Exercising in a Warm Environment

Topham,

Smallcombe,

Brown

et al. 2023

Medicine &Amp; Science in Sports &Amp; Exercise

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Purpose To investigate the associations of biological sex and aerobic fitness (i.e., V̇O2peak) on the change in gastro-intestinal temperature (∆Tgi) and whole-body sweat rate (WBSR) of children exercising in warm conditions. Methods Thirty-eight children (17 boys (mean [SD]; 13.7 [1.2] years); 21 girls (13.6 [1.8] years)) walked for 45 min at a fixed rate of metabolic heat production (8 W·kg-1) in 30 °C and 40% relative humidity. Biological sex and relative V̇O2peak were entered as predictors into a Bayesian hierarchical general additive model (HGAM) for Tgi. For a subsample of 13 girls with measured body composition, body fat percent was entered into a separate HGAM for Tgi. Sex, V̇O2peak and the evaporative requirement for heat balance (Ereq) were entered into a Bayesian hierarchical linear regression for WBSR. Results Mean ∆Tgi for boys was 0.71 °C [90% credible intervals: 0.60, 0.82] and for girls 0.78 °C [0.68, 0.88]. A predicted 20 mL·kg-1·min-1 higher V̇O2peak resulted in a 0.19 °C [-0.03, 0.43] and 0.24 °C [0.07, 0.40] lower ∆Tgi in boys and girls respectively. A predicted ~13% lower body fat in the subsample of girls resulted in a 0.15 °C [-0.12, 0.45] lower ∆Tgi. When Ereq was standardized to the grand mean, the difference in WBSR between boys and girls was -0.00 L·h-1 [-0.06, 0.06] and a 20 mL·kg-1·min-1 higher predicted V̇O2peak resulted in a mean difference in WBSR of -0.07 L·h-1 [-0.15, 0.00]. Conclusions Biological sex did not independently influence ∆Tgi and WBSR in children. However, a higher predicted V̇O2peak resulted in a lower ∆Tgi of children, which was not associated with a greater WBSR, but may be related to differences in body fat percent between high and low fitness individuals.

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“…O planejamento da ingestão de água com base na diferença entre os sexos, modalidade esportiva e outros aspectos como temperatura e umidade se faz necessária para a melhora da performance e manutenção da saúde de atletas e praticantes de exercícios físicos (Ayotte and Corcoran 2018). Adicionalmente, as respostas termorregulatórias ao estresse ambiental são semelhanete em meninas adolescentes e mulheres adultas, assim como, em meninos adolescentes e homens adultos (Rodrigues et al,2019). (Leites et al, 2016).…”

Section: Introductionunclassified

Gênero e hidratação como mediadores relevantes para restauração de processos inflamatórios em atletas jovens

Bachini¹,

Macedo²,

Gonçalves³

et al. 2021

EJHR

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Objetivos: Poucos estudos tem dado a devida importância ao estado de hidratação e as alterações hematológicas em menores de 18 anos. O presente estudo investigou estas alterações em menores de 18 anos na prova de 3000 metros para ambos os gêneros. Método: Foram incluídos os seis melhores participantes das Olimpíadas Nacionais do Ensino Médio (menores de 18 anos) no Brasil. Trata-se de um estudo observacional e transversal. Os atletas correram 3.000 metros em uma pista oval de 400 metros. Foi realizado leucograma total e específico, eritrograma e contagem de plaquetas em quatro diferentes tempos (jejum, pré, pós e recuperação). Os cálculos de comparação entre tempos, apresentados, foram adaptados do modelo matemático de variação percentual. Resultados: Quando comparadas as médias em relação a cada tempo, pode-se notar que os eritrócitos, hemoglobina, hematócrito, leucócitos totais e basófilos aumentaram significativamente após a corrida para ambos os gêneros. Além disso, as plaquetas também aumentaram para ambos os gêneros sem significância. O coeficiente de correlação de Pearson mostrou importante interação leucócitos-plaquetas. Os homens recuperaram seu estado de hidratação em quase metade do tempo em relação as mulheres. Em relação ao sistema imune e resposta inflamatória, as atletas do gênero feminino tiveram um aumento relativo de mais que o dobro para leucócitos e não recuperaram estes valores, além de apresentarem um aumento de eosinófilos neste mesmo tempo, enquanto os atletas do gênero masculino apresentaram diminuição. As mulheres apresentaram um aumento de quase o dobro para linfócitos, enquanto os homens tiveram este comportamento para os fagócitos. Conclusões: O exercício induz alteração do estado de hidratação e sistema imune, tendo diferenças em relação ao gênero. Quando bem conduzido, gera efeitos antiinflamatórios a longo prazo. Quando não há controle sobre o volume, intensidade e recuperação pode causar imunossupressão e promover a suceptibilidade para infecções. Foi possível observar que os atletas do gênero masculino tem um menor estresse inflamatório e recuperam o seu estado de hidratação e a resposta inflamatória mais rápido que as meninas após uma corrida de 3000 metros. Objectives: Few studies have given due importance to the hydration status and hematological alterations in children under 18 years of age. The present study investigated these alterations in children under 18 years old in the 3000 meters test for both genders. Method: The six best participants of Brazil's National High School Olympiads (under 18 years old) were included. This is an observational and cross-sectional study. Athletes ran 3,000 meters on a 400 meters oval track. Total and specific white blood cell count, erythrogram, and platelet count were performed four times (fasting, pre, post, and recovery). The time comparison calculations presented were adapted from the percentage variation mathematical model. Results: When comparing the means for each time, it can be noted that erythrocytes, hemoglobin, hematocrit, total leukocytes, and basophils increased significantly after the race for both genders. Furthermore, platelets also increased for both genders without significance. Pearson's correlation coefficient showed a significant leukocyte-platelet interaction. Men regained their hydration status in almost half the time compared to women. Regarding the immune system and inflammatory response, female athletes had a relative increase of more than double for leukocytes and did not recover these values, in addition to showing an increase in eosinophils simultaneously, while male athletes showed a decrease. Women showed an increase of almost double for lymphocytes, while men showed this behavior for phagocytes. Conclusions: Exercise induces changes in hydration status and immune system, with differences concerning gender. When done well, it generates long-term anti-inflammatory effects. When there is no control over volume, intensity, and recovery, it can cause immunosuppression and increase infection susceptibility. It was observed that male athletes have lower inflammatory stress and recover their hydration status and inflammatory response faster than girls after a 3000 meter run.

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Thermoregulatory and perceptual responses of lean and obese fit and unfit girls exercising in the heat

Cited by 5 publications

References 25 publications

Water-blocking Asphyxia of N95 Medical Respirator During Hot Environment Work Tasks With Whole-body Enclosed Anti-bioaerosol Suit

Water-blocking Asphyxia of N95 Medical Respirator During Hot Environment Work Tasks With Whole-body Enclosed Anti-bioaerosol Suit

Biological Sex Does Not Influence Core Temperature Change and Sweating of Children Exercising in a Warm Environment

Gênero e hidratação como mediadores relevantes para restauração de processos inflamatórios em atletas jovens

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