The Ingestion of 39 or 64 g·h-1 of Carbohydrate is Equally Effective at Improving Endurance Exercise Performance in Cyclists

Newell, M., Hunter, A.M., Lawrence, C., Tipton, K.D. and Galloway, S.D.R. 2015. The Ingestion of 39 or 64 g·h-1 of Carbohydrate is Equally Effective at Improving Endurance Exercise Performance in Cyclists. International Journal of Sport Nutrition and Exercise Metabolism. 25 (3), pp. 285-292. https://doi.org/10.1123/ijsnem.2014-0134

TitleThe Ingestion of 39 or 64 g·h-1 of Carbohydrate is Equally Effective at Improving Endurance Exercise Performance in Cyclists
TypeJournal article
AuthorsNewell, M., Hunter, A.M., Lawrence, C., Tipton, K.D. and Galloway, S.D.R.
Abstract

In an investigator-blind, randomized cross-over design, male cyclists (mean± SD) age 34.0 (± 10.2) years, body mass 74.6 (±7.9) kg, stature 178.3 (±8.0) cm, peak power output (PPO) 393 (±36) W, and VO2max 62 (±9) ml·kg-1·min(-1) training for more than 6 hr/wk for more than 3y (n = 20) completed four experimental trials. Each trial consisted of a 2-hr constant load ride at 95% of lactate threshold (185 ± 25 W) then a work-matched time trial task (~30 min at 70% of PPO). Three commercially available carbohydrate (CHO) beverages, plus a control (water), were administered during the 2-hr ride providing 0, 20, 39, or 64 g·hr-1 of CHO at a fluid intake rate of 1L·hr(-1). Performance was assessed by time to complete the time trial task, mean power output sustained, and pacing strategy used. Mean task completion time (min:sec ± SD) for 39 g·hr(-1) (34:19.5 ± 03:07.1, p = .006) and 64 g·hr(-1) (34:11.3 ± 03:08.5 p = .004) of CHO were significantly faster than control (37:01.9 ± 05:35.0). The mean percentage improvement from control was -6.1% (95% CI: -11.3 to -1.0) and -6.5% (95% CI: -11.7 to -1.4) in the 39 and 64 g·hr(-1) trials respectively. The 20 g·hr(-1) (35:17.6 ± 04:16.3) treatment did not reach statistical significance compared with control (p = .126) despite a mean improvement of -3.7% (95% CI -8.8-1.5%). No further differences between CHO trials were reported. No interaction between CHO dose and pacing strategy occurred. 39 and 64 g·hr-1 of CHO were similarly effective at improving endurance cycling performance compared with a 0 g·hr(-1) control in our trained cyclists.

Keywordsnutrition; metabolism; time trial
JournalInternational Journal of Sport Nutrition and Exercise Metabolism
Journal citation25 (3), pp. 285-292
ISSN1526-484X
1543-2742
Year2015
PublisherHuman Kinetics
Accepted author manuscript
Digital Object Identifier (DOI)https://doi.org/10.1123/ijsnem.2014-0134
PubMed ID25203688
Web address (URL)https://journals.humankinetics.com/view/journals/ijsnem/25/3/article-p285.xml?tab=contributorNotes
Publication dates
Published01 Jun 2015
Published online08 Sep 2014

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