?-Endorphin and adrenocorticotrophin after incremental exercise and marathon running-female responses

1996 ◽  
Vol 72-72 (5-6) ◽  
pp. 417-424 ◽  
Author(s):  
H. -C. Heitkamp ◽  
W. Huber ◽  
K. Scheib
Keyword(s):  
Incremental Exercise ◽  
Marathon Running ◽  
Female Responses

Respiratory Ammonia Output and Blood Ammonia Concentration During Incremental Exercise

1999 ◽  
Vol 20 (02) ◽  
pp. 71-77
Author(s):  
W. Ament ◽  
J. Huizenga ◽  
E. Kort ◽  
T. Mark ◽  
R. Grevink ◽  
...  
Keyword(s):  
Ammonia Concentration ◽  
Incremental Exercise ◽  
Blood Ammonia

Ventilatory and hyperkalemic responses to incremental exercise after propranolol treatment

1994 ◽  
Vol 77 (4) ◽  
pp. 1907-1912 ◽  
Author(s):  
D. A. Schneider ◽  
M. T. McEniery ◽  
C. Solomon ◽  
J. Jurimae ◽  
M. S. Wehr
Keyword(s):  
Minute Ventilation ◽  
Plasma Potassium ◽  
Muscle Afferents ◽  
Incremental Exercise ◽  
Co2 Production ◽  
Beta Blockade ◽  
Adrenergic Blockade ◽  
Propranolol Treatment ◽  
Positive Correlations ◽  
And Control

The purpose of the present study was to examine the relationship of plasma potassium (K+) and minute ventilation (VE) during incremental cycling (20 W/2 min) under conditions of beta-adrenergic blockade (80 mg of propranolol) and placebo in six untrained male subjects. No significant differences existed between treatments in O2 uptake, CO2 production, blood lactate, pH, or VE during the submaximal work stages of incremental exercise common to both treatments (20–220 W). During exercise with beta-blockade, plasma K+ concentrations were found to be significantly elevated compared with control levels at every work stage except 20 W. Significant positive correlations between VE and plasma K+ were found during both beta-blockade (r = 0.99) and control conditions (r = 1.00). Although the high correlation between VE and K+ was not altered with beta-blockade, propranolol treatment resulted in a significant reduction in the slope of this relationship during incremental exercise (P < 0.01). These findings suggest that 1) beta-blockade decreases the VE-K+ relationship observed during exercise and 2) K+ stimulation of muscle afferents is not an important signal in the control of exercise ventilation.

Thermoregulatory responses during competitive marathon running

1977 ◽  
Vol 42 (6) ◽  
pp. 909-914 ◽  
Author(s):  
M. B. Maron ◽  
J. A. Wagner ◽  
S. M. Horvath
Keyword(s):  
Skin Temperature ◽  
Marathon Running ◽  
Heat Illness ◽  
Mean Skin Temperature ◽  
Total Water ◽  
Water Losses ◽  
Thermoregulatory Responses ◽  
Marked Disparity ◽  
Skin Temperatures ◽  
Cool Conditions

To assess thermoregulatory responses occuring under actual marathon racing conditions, rectal (Tre) and five skin temperatures were measured in two runners approximately every 9 min of a competitive marathon run under cool conditions. Race times and total water losses were: runner 1 = 162.7 min, 3.02 kg; runner 2 = 164.6 min, 2.43 kg. Mean skin temperature was similar throughout the race in the two runners, although they exhibited a marked disparity in temperature at individual skin sites. Tre plateaued after 35--45 min (runner 1 = 40.0--40.1, runner 2 = 38.9--39.2 degrees C). While runner 2 maintained a relatively constant level for the remainder of the race, runner 1 exhibited a secondary increase in Tre. Between 113 and 119 min there was a precipitous rise in Tre from 40.9 to 41.9 degrees C. Partitional calorimetric calculations suggested that a decrease in sweating was responsible for this increment. However, runner 1's ability to maintain his high Tre and running pace for the remaining 44 min of the race and exhibit no signs of heat illness indicated thermoregulation was intact.

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