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The effects of caffeine ingestion on performance time, speed and power during a laboratory-based 1 km cycling time-trial.
J Sports Sci. 2006 Nov; 24(11):1165-71.JS

Abstract

There is little published data in relation to the effects of caffeine upon cycling performance, speed and power in trained cyclists, especially during cycling of approximately 60 s duration. To address this, eight trained cyclists performed a 1 km time-trial on an electronically braked cycle ergometer under three conditions: after ingestion of 5 mg x kg-1 caffeine, after ingestion of a placebo, or a control condition. The three time-trials were performed in a randomized order and performance time, mean speed, mean power and peak power were determined. Caffeine ingestion resulted in improved performance time (caffeine vs. placebo vs. control: 71.1 +/- 2.0 vs. 73.4 +/- 2.3 vs. 73.3 +/- 2.7 s; P = 0.02; mean +/- s). This change represented a 3.1% (95% confidence interval: 0.7-5.6) improvement compared with the placebo condition. Mean speed was also higher in the caffeine than placebo and control conditions (caffeine vs. placebo vs. control: 50.7 +/- 1.4 vs. 49.1 +/- 1.5 vs. 49.2 +/- 1.7 km x h-1; P = 0.0005). Mean power increased after caffeine ingestion (caffeine vs. placebo vs. control: 523 +/- 43 vs. 505 +/- 46 vs. 504 +/- 38 W; P = 0.007). Peak power also increased from 864 +/- 107 W (placebo) and 830 +/- 87 W (control) to 940 +/- 83 W after caffeine ingestion (P = 0.027). These results provide support for previous research that found improved performance after caffeine ingestion during short-duration high-intensity exercise. The magnitude of the improvements observed in our study could be due to our use of sport-specific ergometry, a tablet form and trained participants.

Authors+Show Affiliations

Department of Sport Science, Tourism and Leisure, Canterbury Christ Church University, Canterbury, UK. j.d.wiles@cant.ac.ukNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17035165

Citation

Wiles, Jonathan D., et al. "The Effects of Caffeine Ingestion On Performance Time, Speed and Power During a Laboratory-based 1 Km Cycling Time-trial." Journal of Sports Sciences, vol. 24, no. 11, 2006, pp. 1165-71.
Wiles JD, Coleman D, Tegerdine M, et al. The effects of caffeine ingestion on performance time, speed and power during a laboratory-based 1 km cycling time-trial. J Sports Sci. 2006;24(11):1165-71.
Wiles, J. D., Coleman, D., Tegerdine, M., & Swaine, I. L. (2006). The effects of caffeine ingestion on performance time, speed and power during a laboratory-based 1 km cycling time-trial. Journal of Sports Sciences, 24(11), 1165-71.
Wiles JD, et al. The Effects of Caffeine Ingestion On Performance Time, Speed and Power During a Laboratory-based 1 Km Cycling Time-trial. J Sports Sci. 2006;24(11):1165-71. PubMed PMID: 17035165.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The effects of caffeine ingestion on performance time, speed and power during a laboratory-based 1 km cycling time-trial. AU - Wiles,Jonathan D, AU - Coleman,Damian, AU - Tegerdine,Michael, AU - Swaine,Ian L, PY - 2006/10/13/pubmed PY - 2007/2/9/medline PY - 2006/10/13/entrez SP - 1165 EP - 71 JF - Journal of sports sciences JO - J Sports Sci VL - 24 IS - 11 N2 - There is little published data in relation to the effects of caffeine upon cycling performance, speed and power in trained cyclists, especially during cycling of approximately 60 s duration. To address this, eight trained cyclists performed a 1 km time-trial on an electronically braked cycle ergometer under three conditions: after ingestion of 5 mg x kg-1 caffeine, after ingestion of a placebo, or a control condition. The three time-trials were performed in a randomized order and performance time, mean speed, mean power and peak power were determined. Caffeine ingestion resulted in improved performance time (caffeine vs. placebo vs. control: 71.1 +/- 2.0 vs. 73.4 +/- 2.3 vs. 73.3 +/- 2.7 s; P = 0.02; mean +/- s). This change represented a 3.1% (95% confidence interval: 0.7-5.6) improvement compared with the placebo condition. Mean speed was also higher in the caffeine than placebo and control conditions (caffeine vs. placebo vs. control: 50.7 +/- 1.4 vs. 49.1 +/- 1.5 vs. 49.2 +/- 1.7 km x h-1; P = 0.0005). Mean power increased after caffeine ingestion (caffeine vs. placebo vs. control: 523 +/- 43 vs. 505 +/- 46 vs. 504 +/- 38 W; P = 0.007). Peak power also increased from 864 +/- 107 W (placebo) and 830 +/- 87 W (control) to 940 +/- 83 W after caffeine ingestion (P = 0.027). These results provide support for previous research that found improved performance after caffeine ingestion during short-duration high-intensity exercise. The magnitude of the improvements observed in our study could be due to our use of sport-specific ergometry, a tablet form and trained participants. SN - 0264-0414 UR - https://www.unboundmedicine.com/medline/citation/17035165/The_effects_of_caffeine_ingestion_on_performance_time_speed_and_power_during_a_laboratory_based_1_km_cycling_time_trial_ L2 - https://www.tandfonline.com/doi/full/10.1080/02640410500457687 DB - PRIME DP - Unbound Medicine ER -