Water

Cheuvront, Samuel N.; Kenefick, Robert W.; Montain, Scott J.; Sawka, Michael N.

doi:10.1016/b978-0-323-66162-1.00030-5

Cited by 2 publications

(2 citation statements)

References 103 publications

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“…Specifically, during exercise in a hightemperature and high humidity environment, the _ VO 2 between 2 min and 10 min in the HOT was lower compared to the CON, which aligns with the research findings of Sawka (Sawka et al, 1985), González (González-Alonso and Calbet, 2003), and Wingo (Wingo et al, 2020). This can be attributed to the impact of heat stress on the cardiovascular system and oxygen delivery (Cheuvront et al, 2010). Heat stress reduces Cardiac Output (Q) and Mean Arterial Blood Pressure (MAP) by decreasing cardiac output, resulting in reduced skeletal muscle blood flow, oxygen delivery, and _ VO 2 during exercise.…”

Section: Discussionsupporting

confidence: 87%

Differential impact of heat and hypoxia on dynamic oxygen uptake and deoxyhemoglobin parameters during incremental exhaustive exercise

Geng,

Wang,

Cao

et al. 2024

Front. Physiol.

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Purpose: This study aims to explore the relationship between the dynamic changes in oxygen uptake (V˙O2) and deoxyhemoglobin (HHb) and peripheral fatigue in athletes during incremental exhaustive exercise under different environmental conditions, including high temperature and humidity environment, hypoxic environment, and normal conditions.Methods: 12 male modern pentathlon athletes were recruited and performed incremental exhaustive exercise in three different environments: normal condition (23°C, 45%RH, FiO2 = 21.0%, CON), high temperature and humidity environment (35°C, 70%RH, FiO2 = 21.0%, HOT), and hypoxic environment (23°C, 45%RH, FiO2 = 15.6%, HYP). Gas metabolism data of the athletes were collected, and muscle oxygen saturation (SmO2) and total hemoglobin content in the vastus lateralis muscles (VL) were measured to calculate the deoxyhemoglobin content. Linear and nonlinear function models were used to fit the characteristic parameters of V˙O2 and HHb changes.Results: The results showed that compared to the CON, V˙O2, V˙CO2, and exercise time were decreased in the HOT and HYP (p < 0.05). ΔEV˙O2 and OUES were reduced in the HOT and HYP compared to the CON (p < 0.05). The Gas exchange threshold in the CON corresponded to higher V˙O2 than in the HYP and HOT (p < 0.05). ΔEV˙O2‐1 was reduced in the HOT compared to the HYP (p < 0.05). ΔEHHb was higher in the HOT compared to the CON (p < 0.05). ΔEHHb-1 was increased in the HYP compared to the CON (p < 0.05). There was a negative correlation between ΔEHHb and corresponding V˙O2⁡max in the HOT (r = −0.655, p < 0.05), and a negative correlation between ΔEHHb-1 and corresponding V˙O2⁡max in the HYP (r = −0.606, p < 0.05).Conclusion: Incremental exhaustive exercise in hypoxic environment and high temperature and humidity environments inhibits gas exchange and oxygen supply to skeletal muscle tissue in athletes. For athletes, the accelerated deoxygenation response of skeletal muscles during incremental exhaustive exercise in high temperature and humidity environments, as well as the excessive deoxygenation response before BP of deoxyhemoglobin in hypoxic environment, may be contributing factors to peripheral fatigue under different environmental conditions.

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Section: Discussionsupporting

confidence: 87%

Differential impact of heat and hypoxia on dynamic oxygen uptake and deoxyhemoglobin parameters during incremental exhaustive exercise

Geng,

Wang,

Cao

et al. 2024

Front. Physiol.

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“…The concentration of sodium ion in sweat was employed as an indicator of fluctuations in electrolyte levels, when an individual engaged in strenuous exercise or was under conditions of intense perspiring [36]. It was reported that the large losses of sodium ion lead to dehydration, even the other side effects, such as irritability, headache, cramps, and reduced mental functioning, when dehydration led to more than 2 % body weight drops [37, 38]. As same as sodium, potassium was one of the most important ions and had a relationship with the dehydration.…”

Section: Resultsmentioning

confidence: 99%

A Smartwatch Integrated with a Paper‐based Microfluidic Patch for Sweat Electrolytes Monitoring

et al. 2020

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Here, a smartwatch for sweat monitoring was presented for perspiration analysis. The smartwatch played the part of analyzing, computing, and displaying the real‐time data with the feature of comfortable wearing and lightweight ergonomic design. Moreover, the paper‐based microfluidic patch with a three‐dimensional structure was proposed to realize the sweat collection and solve the issue of sweat accumulation. To further realizing the sweat monitoring, the potassium and sodium ion‐selective electrodes were developed by the screen‐printing technique. The experiment of on‐body monitoring the K+ and Na+ in sweat had been carried out to further demonstrate the feasibility of the smartwatch.

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Water

Cited by 2 publications

References 103 publications

Differential impact of heat and hypoxia on dynamic oxygen uptake and deoxyhemoglobin parameters during incremental exhaustive exercise

Differential impact of heat and hypoxia on dynamic oxygen uptake and deoxyhemoglobin parameters during incremental exhaustive exercise

A Smartwatch Integrated with a Paper‐based Microfluidic Patch for Sweat Electrolytes Monitoring

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