ARTICOLI ORIGINALI   

Gazzetta Medica Italiana Archivio per le Scienze Mediche 2014 May;173(5):291-8

Copyright © 2014 EDIZIONI MINERVA MEDICA

lingua: Inglese

Physiological response to fluid intake with and without carbohydrate during indoor cycling classes

Carneiro A. L. G. ^{1, 2, 3}, Jacó De Oliveira R. ⁶, Gama De Matos D. ¹, Aidar F. ^{1, 2, 4}, Mazini Filho M. L. ¹, Hickner R. C. ⁵, Reis V. M. ^{1, 2}

¹ Department of Sport Sciences, Exercise and Health, University of Trás-os-Montes and Alto Douro (UTAD), Portugal; ² Research Centre in Sport Health and Human Development (CIDESD), Vila Real, Portugal; ³ State University at Montes Claros (UNIMONTES), Montes Claros, Brazil; ⁴ Military Minas Gerais State Fire and Rescue Department, 5° Firefighters Military Battalion, Uberlândia, Minas Gerais State, Brazil; ⁵ Departments of Kinesiology and Physiology, Center for Health Disparities Research, East Carolina University, Greenville, USA; ⁶ University of Brasília – Unb Brasília, Distrito Federal, Brazil

AIM: The aim of this study was to investigate the effects of consuming a carbohydrate-containing drink and water on metabolic and physiological variables during an indoor cycling class.
METHODS: The study included 25 physically active individuals of both sexes (31.68±8.89 years, 75.85±15.92 kg, 1.70±0.09 m and 20.18±7.66% body fat. The subjects were divided into three groups: water (G1), carbohydrate drink (G2), and control group (G3). There were five stages of the class, each 10 minutes long: Stage 01 at the end of the warm up. Stage 02 the end of the turnover rate. Stage 03 at the end of the ascent of the mountain. Stage 04 end of mixed terrain. Stage 05 at the end of the racing.
RESULTS: We found significant differences in RPE during stage 5 between G1 (8.80±1.48), G2 (8.50±2.42) and G3 (11.60±0.54), in blood lactate concentration during stage 4 between G1 (8.02±3.7 mmol·L-1) G2 (4.12±0.87 mmol·L-1) and G3 (9.55±4.21 mmol·L-1) and during stage 5 between G1 (6.24±2.84 mmol·L-1), G2 (3.20±1.05 mmol·L-1), and G3 (5.55±1.89 mmol·L-1). Body mass was lower after (73.61±20.85 kg) than before (74.05±20.93 kg) the activity in G3 (p≤0.05).
CONCLUSION: There were no differences in HR or blood glucose at any time during the class. carbohydrate drink tends not to alter HR interfering only in perceived exertion, resting blood glucose and blood lactate.