Vol. 173 - No. 1 GAZZETTA MEDICA ITALIANA - ARCHIVIO PER LE SCIENZE MEDICHE 1 N utrition is an important tool within sport because, when well targeted, can reduce physiological stress, allowing the athlete to train longer or recover better between work- outs. 1 The American College of Sports Med- icine (ACSM) 2 proposes that an adequate nutritional strategy is essential for the athlete, since carbohydrate stores are limited but are crucial for the resynthesis of ATP. Ingestion of water and carbohydrates to reverse the effects of dehydration and pro- vide carbohydrate can result in increased physical performance. 3 Carbohydrate feed- ing maintains blood glucose concentration, with carbohydrate oxidation becoming the largest source of energy during the last stag- 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° Fireighters 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 ???? GAZZ MED ITAL - ARCH SCI MED 2014;173:1-2 A. L. G. CARNEIRO 1, 2, 3 , R. JACÓ DE OLIVEIRA 6 , D. GAMA DE MATOS 1 F. AIDAR 1, 2, 4 , M. L. MAZINI FILHO 1 , R. C. HICKNER 5 , V. M. REIS 1, 2 Physiological response to luid intake with and without carbohydrate during indoor cycling classes Aim. The aim of this study was to investigate the effects of consuming a carbohydrate-con- taining drink and water on metabolic and physiological variables during an indoor cy- cling 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 di- vided into three groups: water (G1), carbo- hydrate drink (G2), and control group (G3). There were ive 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 signiicant 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 be- tween G1 (8.02±3.7 mmol·L -1 ) G2 (4.12±0.87 mmol.L) 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 in- terfering only in perceived exertion, resting blood glucose and blood lactate. KEY WORDS: Carbohydrates - Athletes - Bicycling. Corresponding author: V. Machado Reis, Department of Sport Sciences, Exercise and Health, University of Trás-os- Montes and Alto Douro (UTAD), Rua Dr. Manuel Cardona/ CIFOP, 5000-558 Vila Real, Portugal. E-mail: dihogogmc@hotmail.com 2944-GMI PROOF MINERVA MEDICA