Int J Sports Med 2011; 32(9): 659-665
DOI: 10.1055/s-0031-1271698
Physiology & Biochemistry

© Georg Thieme Verlag KG Stuttgart · New York

Effects of Carbohydrate Beverage Ingestion on the Salivary IgA Response to Intermittent Exercise in the Heat

V. Sari-Sarraf1 , D. A. Doran2 , N. D. Clarke3 , G. Atkinson2 , T. Reilly2
  • 1Faculty of Physical Education and Sport Sciences, University of Tabriz, Tabriz, Islamic Republic of Iran
  • 2Liverpool John Moores University, Research Institute of Sport and Exercise Sciences, Liverpool, United Kingdom
  • 3School of Human Sciences, Faculty of Life Sciences, London Metropolitan University, United Kingdom
Further Information

Publication History

accepted after revision January 13, 2011

Publication Date:
12 September 2011 (online)

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Abstract

The purpose of this study was to establish if provision of CHO altered the mucosal immune and salivary cortisol responses to intermittent exercise in the heat. In a double-blind design, 10 males undertook soccer-specific intermittent exercise on a motorized treadmill on 2 occasions, each over 90 min and separated by 1 week. During CHO and placebo trials, subjects were given either a carbohydrate solution (3 ml · kg−1 body weight) or placebo drink, 5 min before the commencement of exercise, at 15, 30 min, at half time, 60 and 75 min into exercise. Salivary flow rate increased throughout the placebo trial and decreased throughout the CHO treatment; the difference between conditions neared statistical significance (P=0.055). Neither s-IgA concentration nor s-IgA to osmolality ratio was affected by 2 conditions or differed at any time-point post-exercise (P>0.05). The s-IgA secretion rate increased, s-IgA to protein ratio decreased post-exercise and salivary cortisol decreased 24 h post-exercise (P<0.05) compared to pre-exercise. Carbohydrate supplementation whilst exercising in the heat, does not influence rating of perceived exertion, thermal sensation, salivary flow rate, s-IgA concentration, s-IgA secretion rate, s-IgA to osmolality ratio or s-IgA to protein ratio and salivary cortisol but heart rate was increased.