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  • 1
    Electronic Resource
    Electronic Resource
    Effect of a low-carbohydrate diet on plasma and sweat ammonia concentrations during prolonged nonexhausting exercise (1995)
    Springer
    European journal of applied physiology 70 (1995), S. 70-74 
    Details
    ISSN: 1439-6327
    Keywords: Ammonia ; Exercise ; Low-carbohydrate diet ; Sweat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The purpose of this investigation was to examine the effect of low body glycogen stores on plasma ammonia concentration and sweat ammonia excretion during prolonged, nonexhausting exercise of moderate intensity. On two occasions seven healthy untrained men pedalled on a cycle ergometer for 60 min at 50% of their predetermined maximal O2 uptakes ( $$\dot V{\text{O}}_{\text{2}} $$ max) firstly, following 3 days on a normal mixed diet (N-diet) (60% carbohydrates, 25% fat and 15% protein) and secondly, following 3 days on a low-carbohydrate diet (LC-diet) (less than 5% carbohydrates, 50% fat and 45% protein) of equal energy content. Blood was collected from the antecubital vein immediately before, at 30th and at 60th min of exercise. Sweat was collected from the hypogastric region using gauze pads. It was shown that plasma ammonia concentrations after the LC-diet were higher than after the N-diet at both the 30th and 60th min of exercise. Sweat ammonia concentration and total ammonia loss through the sweat were also higher after the LC-diet. The higher ammonia concentrations in plasma and sweat after the LC-diet would seem to indicate an increased ammonia production, which may be related to reduced initial carbohydrate stores.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00601811
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  • 2
    Electronic Resource
    Electronic Resource
    Regulation of glycogen metabolism in rat respiratory muscles during exercise (1988)
    Springer
    European journal of applied physiology 58 (1988), S. 120-124 
    Details
    ISSN: 1439-6327
    Keywords: Respiratory muscle ; Glycogen ; Exercise ; Fasting ; Nicotinic acid ; Beta-adrenergic receptors ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effect of prolonged exercise on the glycogen level in the respiratory muscles (diaphragm — D, external intercostal — IE and internal — II) has been studied in four groups of rats: 1-control, 2-fasted for 24 h, 3-treated with nicotinic acid and 4-treated with propranolol. There was a sharp reduction in glycogen level in each muscle after 30 min exercise in the control and fasted groups. Exercise till exhaustion further lowered the glycogen level in D in the control group and in IE and II in the fasted group. In the fasted group, the level of glycogen in each muscle, at rest, and after 30 min exercise, and in IE and II muscles after exercise till exhaustion was lower than in the control group. Nicotinic acid did not affect the glycogen level either at rest or during exercise as compared with the control group. Propranolol increased the glycogen level in the muscles at rest and during 30 min exercise. It partially prevented glycogen mobilization in D and IE and fully in II during exercise till exhaustion. In the control group, 24 and 48 h after exercise till exhaustion, the level of glycogen in each muscle exceeded the resting control value. It is concluded that exercise-induced glycogen metabolism in the respiratory muscles differs in some respects from that in the limb or heart muscles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00636614
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of decreased availability of substrates on intramuscular triglyceride utilization during exercise (1978)
    Springer
    European journal of applied physiology 40 (1978), S. 27-35 
    Details
    ISSN: 1439-6327
    Keywords: Exercise ; Skeletal muscles ; Triglycerides ; Glycogen ; Free fatty acids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Intramuscular triglycerides mobilization during prolonged physical exercise was examined in rats fed ad libitum, in rats fasted for 24 h and in rats treated with nicotinic acid. It has been found that during exercise the intramuscular triglyceride level was markedly reduced only in the red muscle but not in the white and intermediate muscles. Fasting significantly augmented the utilization of triglycerides in the red muscle during exercise. The post-exercise triglyceride level in the red muscle of the rats treated with nicotinic acid was similar to that in the control group whereas blood FFA level, in the nicotinic acid-treated group was much lower than in the control group. Nicotinic acid increased glycogen utilization in the liver and in the skeletal muscles during exercise. It may be concluded that the major cause of the reduction of the triglyceride level in the red muscle during exercise is a developing shortage of available carbohydrates. The greatly elevated blood FFA level during exercise does not seem to have a sparing effect on the intramuscular triglyceride level during exercise. However, it does spare glycogen content in the liver and the skeletal muscles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00420986
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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