title: Sweat electrolyte loss in asthmatic children during exercise in the heat.
abstract: This study assessed sweat electrolyte concentration and losses in asthmatic children during exercise in the heat. Eleven asthmatics (AG; 11 +/- 2 years old) and 11 nonasthmatics (CG; 10 +/- 1 year old) underwent a maximal progressive cycleergometer test. During a second session, participants cycled in the heat (35 degrees C, 60% RH) of a climatic chamber for 30 min at 50-60% of maximal workload. Sweat was collected using sweat patches attached to the dorsal region. No differences were observed in sweat [Na+] (AG = 35 +/- 12.9 and CG = 43.4 +/- 18 mmol/L) and [Cl-] (AG = 27.3 +/- 10.4 and CG = 38.5 +/- 19.1 mmol/L). There was no difference in sweat Na+ losses (AG = 0.47 +/- 0.36 and CG = 0.66 +/- 0.68 mmol/kg/h) and Cl- losses (AG = 0.37 +/- 0.29 and CG = 0.59 +/- 0.62 mmol/kg/h) between groups. Asthmatic children did not differ from nonasthmatics in their sweat electrolyte concentrations and electrolyte losses.
authors.affiliation: Universidade Federal do Rio Grande so Sul, Escola de Educação Fisica, Porto Alegre, Brazil.
authors.forename: Orlando
authors.initials: O
authors.lastname: Laitano
authors.forename: Jocelito
authors.initials: J
authors.lastname: Martins
authors.forename: Rita
authors.initials: R
authors.lastname: Mattiello
authors.forename: Claudia
authors.initials: C
authors.lastname: Perrone
authors.forename: Gilberto B
authors.initials: GB
authors.lastname: Fischer
authors.forename: Flavia
authors.initials: F
authors.lastname: Meyer
mesh_terms: D000367:Age Factors; D001249:Asthma / Q000503:physiopathology*; D001642:Bicycling; D016022:Case-Control Studies; D002648:Child; D002669:Child Welfare; D004573:Electrolytes; D016552:Ergometry; D015444:Exercise; D005260:Female; D006306:Health Surveys; D006358:Hot Temperature / Q000009:adverse effects*; D006801:Humans; D008297:Male; D011795:Surveys and Questionnaires; D013542:Sweat / Q000737:chemistry*; D014882:Water-Electrolyte Balance; D014883:Water-Electrolyte Imbalance / Q000175:diagnosis* / Q000209:etiology
chemical_list: D004573:Electrolytes