Effects of glucose–fructose versus glucose ingestion on stride characteristics during prolonged treadmill running |
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| Authors: | Patrick B Wilson Stacy J Ingraham |
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| Institution: | 1. Department of Human Movement Sciences, Old Dominion University, Norfolk, VA, USA;2. School of Kinesiology, University of Minnesota, Minneapolis, MN, USA;3. School of Kinesiology, University of Minnesota, Minneapolis, MN, USA;4. Department of Mathematics and Science, Crown College, St. Bonifacius, MN, USA |
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| Abstract: | Scarce research has examined the effects of carbohydrate composition on running stride characteristics. On two occasions, 14 males and 6 females completed a 120-min sub-maximal run followed by a 4-mile time trial. Participants consumed glucose (GLU) or glucose–fructose (GLU–FRU) beverages supplying 1.3 g/min carbohydrate. Substrate use, psychological affect Feeling Scale (FS)], and stride characteristics (stride frequency, stride length, and contact time) were assessed. Effects were expressed as Cohen’s d (90% confidence limits 90% CL]). CLs for stride frequency differences at 53 min (90% CL = 0.04–0.21) and 113 min (90% CL = 0.02–0.24) did not cover 0, indicating a positive effect of GLU–FRU. However, effect sizes were small (d = 0.13) and likely-to-very-likely trivial. Energy expenditure differences at sub-maximal end were very likely trivial (d = 0.08; 90% CL = 0.00–0.17), while FS ratings were possibly higher for GLU–FRU at 50 (d = 0.19; 90% CL = ?0.10–0.48) and 110 min (d = 0.16; 90% CL = ?0.13–0.45). During the time trial, stride length was possibly higher with GLU–FRU (d = 0.13; 90% CL = ?0.08–0.33). Glucose–fructose co-ingestion has no significant effect on stride characteristics during constant-velocity running but may result in slightly higher stride length during self-paced running. |
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| Keywords: | Carbohydrate endurance exercise nutrition |
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