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Dietary salt alters pulmonary function during exercise in exercise-induced asthmatics.
- Source :
-
Journal of sports sciences [J Sports Sci] 2001 Nov; Vol. 19 (11), pp. 865-73. - Publication Year :
- 2001
-
Abstract
- Epidemiological and experimental studies have suggested that dietary salt may play a role in airway responsiveness. We have previously shown that a low salt diet improves and a high salt diet exacerbates post-exercise pulmonary function in individuals with exercise-induced asthma. The aim of this study was to determine the influence of both elevated and restricted salt diets on pulmonary function during exercise in individuals with exercise-induced asthma. Nine men and six women participated in this double-blind, crossover study. The participants entered the study on their normal salt diet and were placed on either a low or high salt diet for 2 weeks. Each diet was randomized, with a 1 week washout period between diets before crossing over to the alternative diet for 2 weeks. The participants underwent treadmill testing at 85% of their age-predicted heart rate on the normal salt diet and at the end of each treatment period. Pulmonary function was assessed during exercise by arterial saturation (ear oximetry) and indirect calorimetry. Twenty-four hour urine collections confirmed compliance with the diets. Arterial saturation was reduced on the high and improved on the low salt diet at higher exercise intensities. Tidal volume and frequency selection during exercise varied with the diets, with a higher tidal volume and lower frequency on the high salt diet, but a lower tidal volume and higher frequency on the low salt diet. This suggested greater airway resistance during the high salt diet. In conclusion, the low salt diet improved and the high salt diet exacerbated pulmonary function during exercise in individuals with exercise-induced asthma. The mechanism of action remains unclear.
- Subjects :
- Adult
Asthma, Exercise-Induced physiopathology
Calorimetry, Indirect
Cross-Over Studies
Double-Blind Method
Female
Humans
Male
Oximetry
Pulmonary Gas Exchange
Respiratory Function Tests
Sodium, Dietary urine
Time Factors
Airway Resistance drug effects
Asthma, Exercise-Induced prevention & control
Bronchoconstriction drug effects
Diet, Sodium-Restricted
Sodium, Dietary administration & dosage
Sodium, Dietary adverse effects
Subjects
Details
- Language :
- English
- ISSN :
- 0264-0414
- Volume :
- 19
- Issue :
- 11
- Database :
- MEDLINE
- Journal :
- Journal of sports sciences
- Publication Type :
- Academic Journal
- Accession number :
- 11695508
- Full Text :
- https://doi.org/10.1080/026404101753113813