title: Effects of glucose-fructose versus glucose ingestion on stride characteristics during prolonged treadmill running.
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.
authors.affiliation: a Department of Human Movement Sciences , Old Dominion University , Norfolk , VA , USA.|b School of Kinesiology , University of Minnesota , Minneapolis , MN , USA.
authors.forename: Patrick B
authors.initials: PB
authors.lastname: Wilson
authors.affiliation: b School of Kinesiology , University of Minnesota , Minneapolis , MN , USA.|c Department of Mathematics and Science , Crown College , St. Bonifacius , MN , USA.
authors.forename: Stacy J
authors.initials: SJ
authors.lastname: Ingraham
mesh_terms: D000328:Adult; D061215:Energy Drinks; D004734:Energy Metabolism / Q000502:physiology; D005080:Exercise Test; D005260:Female; D005632:Fructose / Q000008:administration & dosage*; D005684:Gait / Q000502:physiology; D005947:Glucose / Q000008:administration & dosage*; D006801:Humans; D008297:Male; D064797:Physical Conditioning, Human; D010807:Physical Endurance / Q000502:physiology*; D012420:Running / Q000502:physiology* / Q000523:psychology
chemical_list: D005632:Fructose; D005947:Glucose
keywords: Carbohydrate; endurance; exercise; nutrition