scholarly journals The Exchangeable Apolipoprotein Nplp2 Sustains Lipid Flow and Heat Acclimation in Drosophila

Cell Reports ◽  
2019 ◽  
Vol 27 (3) ◽  
pp. 886-899.e6 ◽  
Author(s):  
Samuel Rommelaere ◽  
Jean-Philippe Boquete ◽  
Jérémie Piton ◽  
Shu Kondo ◽  
Bruno Lemaitre
Keyword(s):  
Heat Acclimation ◽  
Exchangeable Apolipoprotein

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

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

scholarly journals Plasma aldosterone and sweat sodium concentrations after exercise and heat acclimation

1986 ◽  
Vol 61 (3) ◽  
pp. 967-970 ◽  
Author(s):  
C. R. Kirby ◽  
V. A. Convertino
Keyword(s):  
Sweat Rate ◽  
Total Content ◽  
Heat Acclimation ◽  
Eccrine Sweat Gland ◽  
Plasma Aldosterone ◽  
Exercise Heart Rate ◽  
Sodium Reabsorption ◽  
Plasma Aldosterone Concentration ◽  
The Relationship ◽  
Sweat Sodium

This investigation was designed to determine the relationship between the levels of plasma aldosterone and eccrine sweat gland sodium excretion following exercise and heat acclimation. Ten subjects exercised at 45% of their maximal O2 uptake in a hot (40 degrees C), moderately humid (45% relative humidity) environment for 2 h/day on ten consecutive days. Acclimation was verified by significant reductions in exercise heart rate, rectal temperature, and heat storage, as well as significant elevation of resting plasma volume (12%, P less than 0.05) and exercise sweat rate on day 10 compared with day 1 of acclimation. During exercise, the concentration and total content of sodium in sweat as well as plasma aldosterone were significantly decreased from day 1 to day 10. The ratio of sweat sodium reabsorbed to plasma aldosterone concentration was significantly increased from day 1 to day 10 after both 1 and 2 h of exercise. These data indicate that plasma aldosterone concentrations decrease following heat acclimation; and eccrine gland responsiveness to aldosterone, as represented by sweat sodium reabsorption, may be augumented through exercise and heat acclimation.

Substrate utilization in leg muscle of men after heat acclimation

1987 ◽  
Vol 63 (1) ◽  
pp. 31-35 ◽  
Author(s):  
J. P. Kirwan ◽  
D. L. Costill ◽  
H. Kuipers ◽  
M. J. Burrell ◽  
W. J. Fink ◽  
...  
Keyword(s):  
Blood Flow ◽  
Muscle Glycogen ◽  
Respiratory Exchange Ratio ◽  
Plasma Free Fatty Acid ◽  
Heat Acclimation ◽  
Substrate Utilization ◽  
Acclimation Period ◽  
Glycogen Utilization ◽  
Leg Muscle ◽  
Increased Blood Flow

Eight men were heat acclimated (39.6 degrees C and 29.2% rh) for 8 days to examine changes in substrate utilization. A heat exercise test (HET), (cycling for 60 min; 50% maximal O2 consumption) was performed before (UN-HET) and after (ACC-HET) the acclimation period. Muscle glycogen utilization (67.0 vs. 37.6 mmol/kg wet wt), respiratory exchange ratio (0.85 +/- 0.002 vs. 0.83 +/- 0.001), and calculated rate of carbohydrate oxidation (75.15 +/- 1.38 vs. 64.80 +/- 1.52 g/h) were significantly reduced (P less than 0.05) during the ACC-HET. Significantly lower (P less than 0.05) femoral venous glucose (15, 30, and 45 min) and lactate (15 min) levels were observed during the ACC-HET. No differences were observed in plasma free fatty acid (FFA) and glycerol concentrations or glucose, lactate and glycerol arteriovenous uptake/release between tests. A small but significant increase (P less than 0.05) above resting levels in FFA uptake was observed during the ACC-HET. Leg blood flow was slightly greater (P greater than 0.05) during the ACC-HET (4.64 +/- 0.13 vs. 4.80 +/- 0.13 l/min). These findings indicate a reduced use of muscle glycogen following heat acclimation. However, the decrease is not completely explained by a shift toward greater lipid oxidation or increased blood flow.

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