Changes in the composition of the urine after muscular exercise.

Wilson, D. Wright; Long, W. L.; Thompson, Hilaire; Thurlow, Sylva

doi:10.3181/00379727-21-214

Cited by 4 publications

(2 citation statements)

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“…Although a 15-20% increase in splanchnic alanine uptake was observed with the mild and moderate work loads, previous studies (38) have failed to demonstrate an elevation in urine nitrogen excretion which would be anticipated if gluconeogenesis were increasing in association with exercise. This seeming discrepancy is resolved by the fact that while alanine uptake is increasing, splanchnic extraction of other glycogenic amino acids (serine, threonine, tyrosine) is declining (Table VI).…”

Section: Resultsmentioning

confidence: 77%

Amino acid metabolism in exercising man

Felig¹,

Wahren²

1971

J. Clin. Invest.

402

189

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A B S T R A C T Arterial concentration and net exchange across the leg and splanchnic bed of 19 amino acids were determined in healthy, postabsorptive subjects in the resting state and after 10 and 40 min of exercise on a bicycle ergometer at work intensities of 400, 800, and 1200 kg-m/min. Arterio-portal venous differences were measured in five subjects undergoing elective cholecystectomy.In the resting state significant net release from the leg was noted for 13 amino acids, and significant splanchnic uptake was observed for 10 amino acids. Peripheral release and splanchnic uptake of alanine exceeded that of all other amino acids, accounting for 35-40% of total net amino acid exchange. Alanine and other amino acids were released in small amounts (relative to net splanchnic uptake) by the extrahepatic splanchnic tissues drained by the portal vein.During exercise arterial ananine rose 20-25% with mild exertion and 60-96% at the heavier work loads.Both at rest and during exercise a direct correlation was observed between arterial alanine and arterial pyruvate levels. Net amino acid release across the exercising leg was consistently observed at all levels of work intensity only for alanine. Estimated leg alanine output increased above resting levels in proportion to the work load. Splanchnic alanine uptake during exercise exceeded that of all other amino acids and increased by 15-20% during mild and moderate exercise, primarily as a consequence of augmented fractional extraction of alanine. For all other amino acids, there was no change in arterial concentration during mild exercise. At heavier work loads, increases of 8-35% were noted for isoleucine, leucine, methionine, tyrosine, and phenylalanine, which were atThis work was presented in part at the 62nd Annual

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Section: Resultsmentioning

confidence: 77%

Amino acid metabolism in exercising man

Felig¹,

Wahren²

1971

J. Clin. Invest.

402

189

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“…After intense exercise, urine becomes more acid and there is an increase in ammonia excretion which leads to a decrease in pH. This urine acidity occurs 10 minutes after ceasing exercise and it is maintained for up to 50–90 minutes afterwards [51] . The badminton match caused a decrease in the pH of the urine which was significant in the men’s group (pre = 7.20±1.21; post = 6.25±0.87, p<0.05) and tended to be significant in the women’s group (pre = 7.20±1.08; post = 6.28±1.05, p = 0.06).…”

Section: Discussionmentioning

confidence: 99%

Analysis of Dehydration and Strength in Elite Badminton Players

et al. 2012

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BackgroundThe negative effects of dehydration on aerobic activities are well established. However, it is unknown how dehydration affects intermittent sports performance. The purpose of this study was to identify the level of dehydration in elite badminton players and its relation to muscle strength and power production.MethodologySeventy matches from the National Spanish badminton championship were analyzed (46 men’s singles and 24 women’s singles). Before and after each match, jump height and power production were determined during a countermovement jump on a force platform. Participants’ body weight and a urine sample were also obtained before and after each match. The amount of liquid that the players drank during the match was also calculated by weighing their individual drinking bottles.Results and DiscussionSweat rate during the game was 1.14±0.46 l/h in men and 1.02±0.64 l/h in women. The players rehydrated at a rate of 1.10±0.55 l/h and 1.01±0.44 l/h in the male and female groups respectively. Thus, the dehydration attained during the game was only 0.37±0.50% in men and 0.32±0.83% in women. No differences were found in any of the parameters analyzed during the vertical jump (men: from 31.82±5.29 to 32.90±4.49 W/kg; p>0.05, women: from 26.36±4.73 to 27.25±4.44 W/kg; p>0.05). Post-exercise urine samples revealed proteinuria (60.9% of cases in men and 66.7% in women), leukocyturia (men = 43.5% and women = 50.0%) and erythrocyturia (men = 50.0% and women = 21.7%).ConclusionsDespite a moderate sweat rate, badminton players adequately hydrated during a game and thus the dehydration attained was low. The badminton match did not cause muscle fatigue but it significantly increased the prevalence of proteinuria, leukocyturia and erythrocyturia.

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�ber den Wasserhaushalt bei Epilepsie

Weinland

1949

Archiv f�r Psychiatrie und Zeitschrift Neurologie

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Changes in the composition of the urine after muscular exercise.

Cited by 4 publications

References 0 publications

Amino acid metabolism in exercising man

Amino acid metabolism in exercising man

Analysis of Dehydration and Strength in Elite Badminton Players

�ber den Wasserhaushalt bei Epilepsie

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