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Titolo:
Fluid ingestion does not influence intense 1-h exercise performance in a mild environment
Autore:
McConell, GK; Stephens, TJ; Canny, BJ;
Indirizzi:
Monash Univ, Dept Physiol, Clayton, Vic 3168, Australia Monash Univ Clayton Vic Australia 3168 siol, Clayton, Vic 3168, Australia
Titolo Testata:
MEDICINE AND SCIENCE IN SPORTS AND EXERCISE
fascicolo: 3, volume: 31, anno: 1999,
pagine: 386 - 392
SICI:
0195-9131(199903)31:3<386:FIDNII>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
CARDIOVASCULAR DRIFT; CYCLING PERFORMANCE; PROLONGED EXERCISE; DEHYDRATION; VOLUME; BLOOD; CARBOHYDRATE; REPLACEMENT; ABSORPTION; INCREASES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: McConell, GK Monash Univ, Dept Physiol, Clayton, Vic 3168, Australia Monash Univ Clayton Vic Australia 3168 , Vic 3168, Australia
Citazione:
G.K. McConell et al., "Fluid ingestion does not influence intense 1-h exercise performance in a mild environment", MED SCI SPT, 31(3), 1999, pp. 386-392

Abstract

Purpose: It is generally recommended that fluid be ingested during exercise at a rate that prevents body mass loss and prevents dehydration. It is, however, not known whether these recommendations are Valid during intense endurance exercise in a mild environment. The purpose of this study was to examine the effect of fluid ingestion volume on heart rate (HR), rectal temperature, plasma electrolytes, and performance during intense endurance exercise at 21 degrees C. Methods: Eight well-trained men (26 +/- 1 yr; 79.6 +/-3.5 kg; (V) over dot O-2peak = 5.05 +/- 0.17 L.min(-1); mean +/- SEM) cycled for 45 min at 80 +/- 1% (V) over dot O-2peak while receiving either no fluid replacement (NF), a volume of water that prevented body mass loss (FR-100 = 1.47 +/- 0.05 L), or 50% of this volume (FR-50 = 0.72 +/- 0.03 L). The 45-min exercise bout was followed immediately by a 15-min "all-out" performance ride. Results: NF was associated with a 1.9 +/- 0.0% body mass loss,while FR-50 and FR-100 resulted in losses of 1.0 +/- 0.1% and 0.0 +/- 0.1%, respectively. Although values tended to be higher in NF, fluid ingestion had no significant effect on HR or rectal temperature during exercise. Reductions in plasma volume and increases in plasma sodium and potassium concentrations during exercise were largely unaffected by fluid ingestion. RPE increased to a similar extent during exercise in the three trials while a mild increase in the degree of stomach bloating/fullness was evident in FR-100. Work completed during the 15-min performance ride was similar in the three trials (NF: 233 +/- 8, FR-50: 267 +/- 8, FR-100: 269 +/- 9 kJ). Conclusions: There appears to be little benefit from ingesting water during intense 1-h cycling exercise in mild environmental conditions since such ingestion has no significant effect on IIR, body temperature, plasma volume, plasma electrolytes, or performance.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 03:26:01