Oral Creatine Supplementation Decreases Blood Lactate during Exhaustive, Incremental Cycling.
Oliver JM, Joubert DP, Martin SE, Crouse SF.
SourceApplied Exercise Science Laboratory, Texas A&M University, College Station, TX and the Neuromuscular Research Laboratory, University of Pittsburgh, Pittsburgh, PA.
PURPOSE: The purpose of this study was to determine the effects of creatine supplementation on blood lactate during incremental cycling exercise.
METHODS: Thirteen male subjects (mean ± SD: 23 ± 2 years; 178.0 ± 8.1 cm; 86.3 ± 16.0 kg; 24 ± 9 % body fat) performed a maximal, incremental cycling test to exhaustion before (Pre) and after (Post) 6-days of creatine supplementation (4-doses per day of 5 g creatine + 15 g glucose). Blood lactate was measured at the end of each exercise stage during the protocol, and the lactate threshold was determined as the stage prior to achieving 4 mmol·L-1. Lactate concentrations during the incremental test were analyzed using a 2 (condition) x 6 (exercise stage) repeated measures ANOVA. Differences in power at lactate threshold, power at exhaustion, and total exercise time were determined by paired t-tests and are presented as means ± SD.
RESULTS: Lactate concentrations were reduced during exercise following supplementation, demonstrating a significant condition effect (p = 0.041). There was a tendency for increased power at the lactate threshold (Pre: 128 ± 45 W; Post: 143 ± 26 W; p = 0.11). Total time to fatigue approached significant increases (Pre: 22.6 ± 3.2 min.; Post: 23.3 ± 3.3 min.; p = 0.056), as did maximal power output (Pre: 212.5 ± 32.5 W; Post: 220 ± 34.6 W; p = 0.082).
CONCLUSIONS: Our findings demonstrate creatine supplementation decreases lactate during incremental cycling exercise and tends to raise lactate threshold. Therefore, creatine supplementation could potentially benefit endurance athletes.
Has anyone ever tired supplementing creatine into their diet prior to a mid distance race (maybe 4-5 days prior)?