Lemon, Orenstein and Henke (1984) Protein metabolism during moderate exercise in cystic fibrosis patients

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Protein metabolism during moderate exercise in cystic fibrosis patients

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CONTRIBUTORS:

	Author:	Lemon, P. W. R.
	Author:	Orenstein, D. M.
	Author:	Henke, K. G.

JOURNAL:

Journal of Sports Sciences (JSS), ??( 2), ?? - ??.

YEAR:

1984

PUB TYPE:

Journal Article

SUBJECT(S):

CYSTIC-FIBROSIS; EXERCISE; TESTING; BICYCLE-ERGOMETRY; UREA; NITROGEN; SWEATING; URINE; PROTEIN; METABOLISM; HEAT; MAN; WOMAN; NON-ATHLETE

DISCIPLINE:

No discipline assigned

HTTP:

LANGUAGE:

English

PUB ID:

103-366-215 (Last edited on 2002/02/27 18:45:02 US/Mountain)

SPONSOR(S):

ABSTRACT:
Recent evidence indicates that protein utilization during exercise is greater than is generally believed. Increases in sweat urea nitrogen suggest that during exercise sweat is a major vehicle for excretion of the toxic NH3, resulting from protein degradation. Cystic fibrosis is manifested by disturbances in secretions of the respiratory, digestive and sweat glands. To further investigate the importance of the sweating mechanism as a mode of urea nitrogen excretion we studied the response of five cystic fibrosis patients and five health controls to acute exercise in the heat. Subjects rode a cycle ergometer. Water was provided freely. Rectal temperature, ECG (CM5), sweat (whole body washdown) and pre-exercise and post-exercise urine samples were measured. Both healthy and cystic fibrosis subjects had similar peak rectal temperatures, peak heart rate, sweat rates and pre-exercise urine urea nitrogen. The cystic fibrosis patients had higher post-exercise urine urea nitrogen and lower sweat urea nitrogen than the controls. If the urea data are converted to the equivalent quantity of degraded protein, due to a higher mean workload in the healthy subjects, the contribution of protein to total energy expenditure was similar. These results suggest that: (a) cystic fibrosis has little effect on sweat urea N excretion during exercise, (b) exercise may cause a greater degree of dehydration in cystic fibroses.

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