The Influence of Ingesting a Carbohydrate-Electrolyte Beverage during 4 Hours of Recovery on Subsequent Endurance Capacity

in International Journal of Sport Nutrition and Exercise Metabolism
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Recovery from prolonged exercise involves both rehydration and replenishment of endogenous carbohydrate stores. The present study examined the influence of ingesting a carbohydrate-electrolyte (CE) solution following prolonged running, on exercise capacity 4 hr later. Twelve men and 4 women were divided into two matched groups, which were randomly assigned to either a control (P) or a carbohydrate (CHO) condition. Both groups ran at 70% of maximal oxygen uptake (VO2max) on a level treadmill for 90 min or until volitional fatigue (R,), and they ran at the same %VO2max to exhaustion 4 hr later to assess endurance capacity (R2). The CHO group ingested a 6.9% CE solution providing 1.0 g CHO · kg body weight−1 immediately post-R, and again 2 hr later. The P group ingested equal volumes of a placebo solution. Run times (mean ± SEM) for Rj did not differ between the groups (P 86.3 ± 3.8 min; CHO 87.5 ± 2.5 min). The CHO group ran 22.2 (±3.5) min longer than the P group during R2 (P 39.8 ± 6.1 min; CHO 62.0 ± 6.2 min) (p < .05). Thus, ingesting a 6.9% carbohydrate-electrolyte beverage following prolonged, constant-pace running improves endurance capacity 4 hr later.

J.L. Fallowfield is with the Physical Education, Sports Science and Recreation Studies Section, Chichester Institute, College Lane, Chichester, PO19 4PE, UK. C. Williams is with the Department of Physical Education, Sports Science and Recreation Management, Loughborough University, Loughborough, LEI 1 3TU, UK. R. Singh is with the Department of Physiology, School of Medical Sciences, Universiti Sains Malaysia, 11950 Kubac Kerian, Kelantan, Malaysia. Direct correspondence to C. Williams.

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