scholarly journals Assessment of Murine Exercise Endurance Without the Use of a Shock Grid: An Alternative to Forced Exercise

10.3791/51846 ◽  
2014 ◽  
Author(s):  
Jennifer D. Conner ◽  
Tami Wolden-Hanson ◽  
LeBris S. Quinn
Keyword(s):  
Exercise Endurance ◽  
Shock Grid

Effect of 8 and 12 weeks' once-daily tiotropium and olodaterol, alone and combined with exercise training, on exercise endurance during walking in patients with COPD

Pneumologie ◽  
2017 ◽  
Vol 71 (S 01) ◽  
pp. S1-S125
Author(s):  
T Troosters ◽  
J Bourbeau ◽  
F Maltais ◽  
N Leidy ◽  
D Erzen ◽  
...  
Keyword(s):  
Exercise Training ◽  
Once Daily ◽  
Exercise Endurance

γ‐Oryzanol improves exercise endurance and muscle strength by upregulating PPARδ and ERRγ activity in aged mice

2021 ◽  
pp. 2000652
Author(s):  
Jisong Ahn ◽  
Hyo Jeong Son ◽  
Hyo Deok Seo ◽  
Tae Youl Ha ◽  
Jiyun Ahn ◽  
...  
Keyword(s):  
Muscle Strength ◽  
Aged Mice ◽  
Exercise Endurance

Exercise Training and the Speed of Self-Selected Walking Pace in Men at Retirement

1986 ◽  
Vol 5 (1) ◽  
pp. 19-26 ◽  
Author(s):  
D. A. Cunningham ◽  
P. A. Rechnitzer ◽  
A. P. Donner
Keyword(s):  
Exercise Training ◽  
Training Program ◽  
Walking Speed ◽  
Exercise Group ◽  
Cardiovascular Fitness ◽  
Blue Collar ◽  
Intervention Trial ◽  
Before And After ◽  
Exercise Endurance ◽  
One Year

ABSTRACTAn intervention trial with regular physical activity was carried out to test the hypothesis that walking speed is related to the level of cardiovascular fitness (maximal oxygen uptake). Earlier research has demonstrated that when VO2 max is held constant in a multiple regression analysis the association between walking speed and age (29–65 y) is eliminated. To describe the association between self-selected speeds of walking, and level of cardiovascular fitness, 63 men age 60 to 65 were studied before and after a 1 year program of exercise training. VO2 max was determined on a motor driven treadmill. A test of self-selected walking pace was administered over a 240 m indoor course. The men were asked to walk at 3 paces considered by the subjects to be rather slow, normal, and fast, respectively. They were randomly assigned with stratification for white and blue collar occupation to a program of exercise training (n = 33) or control (n = 27). The training program consisted of walking or jogging for 30 min three times per week for one year. After the training program the exercise group increased their VO2 max (9.5%) and their normal walking speed (1.29 to 1.43 m.s−1) significantly compared to the controls. A program of exercise endurance training will result in an increase in the speed of self-selected pace.

Effects of extracellular HCO3− on fatigue, pHi, and K+ efflux in rat skeletal muscles

2007 ◽  
Vol 103 (2) ◽  
pp. 494-503 ◽  
Author(s):  
Martin Broch-Lips ◽  
Kristian Overgaard ◽  
Helle A. Praetorius ◽  
Ole Bækgaard Nielsen
Keyword(s):  
Skeletal Muscles ◽  
Extensor Digitorum Longus ◽  
Ergogenic Effect ◽  
Elevated Plasma ◽  
Improve Performance ◽  
Muscle Enzymes ◽  
Muscle Ph ◽  
Exercise Endurance ◽  
Unit Reduction ◽  
Isolated Rat

Elevated plasma HCO3− can improve exercise endurance in humans. This effect has been related to attenuation of the work-induced reduction in muscle pH, which is suggested to improve performance via at least two mechanisms: 1) less inhibition of muscle enzymes and 2) reduced opening of muscle KATP channels with less ensuing reduction in excitability. Aiming at determining whether the ergogenic effect of HCO3− is related to effects on muscles, we examined the effect of elevating extracellular HCO3− from 25 to 40 mM (pH from 7.4 to 7.6) on fatigue, intracellular pH (pHi), and K+ efflux in isolated rat skeletal muscles contracting isometrically. Fatigue induced by 30-Hz stimulation at 30 and 37°C was similar between soleus muscles incubated in high and normal HCO3− concentrations. In extensor digitorum longus muscles stimulated at 60 Hz, elevated HCO3− did not affect fatigue at 30°C. In soleus muscles, 30-Hz stimulation induced a ∼0.2 unit reduction in pHi, as determined by using the pH-sensitive probe 2′,7′-bis(2-carboxyethyl)-5( 6 )-carboxyfluorescein. This reduction in pHi was not affected by elevated HCO3−. Estimation of K+ efflux using 86Rb+ showed that elevated HCO3− did not affect K+ efflux at rest or during contractions. Similarly, other modifications of the intra- and extracellular pH had little effect on K+ efflux during contraction. In conclusion, elevated extracellular HCO3− had no significant effect on muscle fatigue, pHi, and K+ efflux. These findings indicate that alternative mechanisms must be considered for the ergogenic effect of HCO3− observed in integral exercise studies.

Effects of acute prednisolone administration on exercise endurance and metabolism

2008 ◽  
Vol 42 (4) ◽  
pp. 250-254 ◽  
Author(s):  
A Arlettaz ◽  
K Collomp ◽  
H Portier ◽  
A-M Lecoq ◽  
N Rieth ◽  
...  
Keyword(s):  
Exercise Endurance
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