scholarly journals Heat Acclimation Does Not Modify Q10 and Thermal Cardiac Reactivity

2019 ◽  
Vol 10 ◽  
Author(s):  
Bernhard Kampmann ◽  
Peter Bröde
Keyword(s):  
Heat Acclimation ◽  
Cardiac Reactivity

Effects of short‐term heat acclimation on whole‐body heat exchange and local nitric oxide synthase‐ and cyclooxygenase‐dependent heat loss responses in exercising older men

2020 ◽  
Author(s):  
Naoto Fujii ◽  
Gregory W. McGarr ◽  
Sean R. Notley ◽  
Pierre Boulay ◽  
Ronald J. Sigal ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Heat Exchange ◽  
Nitric Oxide Synthase ◽  
Heat Loss ◽  
Heat Acclimation ◽  
Older Men ◽  
Whole Body ◽  
Short Term ◽  
Oxide Synthase ◽  
Body Heat

scholarly journals A comparison of heat acclimation by post-exercise hot water immersion and exercise in the heat

2021 ◽  
Author(s):  
Robert D. McIntyre ◽  
Michael J. Zurawlew ◽  
Samuel J. Oliver ◽  
Andrew T. Cox ◽  
Jessica A. Mee ◽  
...  
Keyword(s):  
Water Immersion ◽  
Heat Acclimation ◽  
Hot Water ◽  
Post Exercise ◽  
Hot Water Immersion

Matching the Heart to Heat-Induced Circulatory Load: Heat-Acclimatory Responses

Physiology ◽  
2003 ◽  
Vol 18 (6) ◽  
pp. 215-221 ◽  
Author(s):  
Michal Horowitz
Keyword(s):  
Heart Rate ◽  
Oxygen Demand ◽  
Heat Acclimation ◽  
Regulatory Proteins ◽  
Contractile Apparatus ◽  
Cardiac Efficiency ◽  
Cross Tolerance ◽  
Altered Expression ◽  
Expression Of Genes ◽  
Cardiac Adaptation

Heat acclimation enhances cardiac efficiency by increasing stroke volume and decreasing heart rate. These adaptations involve biochemical changes in the contractile apparatus, switched on by altered expression of genes coding contractile and calcium-regulatory proteins and partially mediated by persistent low thyroxine. Heat acclimation also produces cross-tolerance to oxygen deprivation, thus reinforcing cardiac adaptation to oxygen demand/supply mismatching via energy-sparing pathways.

Maximum Skin Wettedness after Aerobic Training with and without Heat Acclimation

2018 ◽  
Vol 50 (2) ◽  
pp. 299-307 ◽  
Author(s):  
NICHOLAS RAVANELLI ◽  
GEOFF B. COOMBS ◽  
PASCAL IMBEAULT ◽  
OLLIE JAY
Keyword(s):  
Aerobic Training ◽  
Heat Acclimation ◽  
Skin Wettedness

Blunted Heart Rate Recovery to Spontaneous Nocturnal Arousals in Short Sleeping Adults

2021 ◽  
Author(s):  
Jeremy A. Bigalke ◽  
Ian M. Greenlund ◽  
Jennifer R. Nicevski ◽  
Carl A. Smoot ◽  
Benjamin Oosterhoff ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Recovery ◽  
Recovery Period ◽  
Sleep Time ◽  
Cardiovascular Complications ◽  
Female Age ◽  
Cardiac Reactivity ◽  
Electrocardiogram Ecg ◽  
The Relationship ◽  
At Home

Chronic insufficient sleep is a common occurrence around the world, and results in numerous physiological detriments and consequences, including cardiovascular complications. The purpose of the present study was to assess the relationship between habitual total sleep time (TST) measured objectively via at-home actigraphy and heart rate (HR) reactivity to nocturnal cortical arousals. We hypothesized that short habitual TST would be associated with exaggerated cardiac reactivity to nocturnal cortical arousals. Participants included in 35 healthy individuals (20 male, 15 female, age: 24 ± 1, BMI: 27 ± 1 kg/m2), and were split using a median analysis into short (SS; n = 17) and normal sleeping (NS; n = 18) adults based on a minimum of 7 days of at-home actigraphy testing. All participants underwent a full overnight laboratory polysomnography (PSG) testing session, including continuous HR (electrocardiogram, ECG) sampling. HR reactivities to all spontaneous cortical arousals were assessed for 20 cardiac cycles following the onset of the arousal in all participants. Baseline HR was not significantly different between groups (P > .05). Spontaneous nocturnal arousal elicited an augmented HR response in the SS group, specifically during the recovery period [F (4.192, 134.134) = 3.413, p = .01]. There were no significant differences in HR reactivity between sexes [F (4.006, 128.189) = .429, p > .05]. These findings offer evidence of nocturnal cardiovascular dysregulation in habitual short sleepers, independent from any diagnosed sleep disorders.

Polycythemia and hydration: effects on thermoregulation and blood volume during exercise-heat stress

1988 ◽  
Vol 255 (3) ◽  
pp. R456-R463 ◽  
Author(s):  
M. N. Sawka ◽  
R. R. Gonzalez ◽  
A. J. Young ◽  
S. R. Muza ◽  
K. B. Pandolf ◽  
...  
Keyword(s):  
Heat Stress ◽  
Blood Volume ◽  
Plasma Volume ◽  
Heat Acclimation ◽  
Phosphate Solution ◽  
Stress Tests ◽  
Sweating Rate ◽  
Protein Mass ◽  
Glucose Phosphate ◽  
Humidity Environment

We studied the effects of autologous erythrocyte infusion on thermoregulation and blood volume during exercise in the heat. Specifically, we wanted to determine whether heat-acclimated subjects, as well as hypohydrated subjects, would have a thermoregulatory advantage from acute polycythemia during exercise in the heat. Five heat-acclimated males attempted four heat stress tests (HSTs): two pre- and two postinfusion. Autologous erythrocyte infusion was accomplished with 500 ml of a NaCl-glucose-phosphate solution containing approximately 60% hematocrit. One HST, both pre- and postinfusion, was done while subjects were euhydrated, and one HST was done while subjects were hypohydrated (-5% of body wt). After 30 min of rest in a 20 degrees C antechamber, the HST consisted of a 120-min exposure (2 repeats of 15 min rest and 45 min walking) in a hot (35 degrees C, 45% relative humidity) environment. The findings concerning acute polycythemia in heat-acclimated subjects are summarized: 1) polycythemia increased (P less than 0.05) sweating rate and reduced (P less than 0.01) core temperature during exercise-heat stress for both euhydrated and hypohydrated subjects; 2) the erythrocyte infusion caused an increased (P less than 0.05) plasma volume and increased (P less than 0.01) blood volume; 3) the increased plasma volume was associated with an increased (P less than 0.05) total circulating protein mass; 4) the increased total circulating protein mass tended to better maintain plasma volume when hypohydrated; and 5) heat acclimation may increase extravascular protein mass. Therefore, it is concluded that erythrocyte infusion provides a thermoregulatory advantage during exercise in the heat for heat acclimated subjects when both euhydrated and hypohydrated.

Genomics and proteomics of heat acclimation

10.2741/s118 ◽  
2010 ◽  
Vol S2 (3) ◽  
pp. 1068-1080 ◽  
Author(s):  
Michal Horowitz
Keyword(s):  
Heat Acclimation ◽  
Genomics And Proteomics
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