Journal
MEDICINE AND SCIENCE IN SPORTS AND EXERCISE
Volume 41, Issue 1, Pages 221-229Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1249/MSS.0b013e31818313b6
Keywords
WARM-UP; ENERGY DISTRIBUTION; O-2 DEFICIT; AEROBIC CONTRIBUTION
Categories
Funding
- Sport and Recreation New Zealand (SPARC)
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PALMER, C. D., A.M. JONES, G. J. KENNEDY, and J. D. COTTER. Effects of Prior Heavy Exercise on Energy Supply and 4000-m Cycling Performance. Med. Sci. Sports Exerc., Vol. 41, No. 1, pp. 221-229, 2009. Purpose: This study was designed to determine the effects of prior exercise on energy supply and performance in a laboratory-based 4000-m time trial. Methods: After one familiarization trial, eight well-trained cyclists (mean +/- SD; age 30 +/- 8 yr, body mass = 78.7 +/- 8.6 kg, stature = 181 +/- 5 cm, (V) over dot O-2 (peak) = 63.7 +/- 6.7 mL.kg(-1).min(-1), peak power output (PPO) = 366 +/- 39 W) performed three 4000-m laboratory-based cycling time trials each preceded by one of three prior exercise regimens in randomized order: no prior exercise (control), prior heavy exercise, and self-selected prior exercise. Results: Cyclists adopted a wide range of self-selected prior exercise regimens: duration ranged 11-80 min, intensity = 48-120% PPO, and recovery = 2-11 min. Relative to control, pre-time-trial blood lactate was raised by 2.5 +/- 1.9 and 1.4 +/- 1.5 mmol.L-1 after prior heavy and self-selected exercise, respectively. The 4000 m was completed 2.0 +/- 2.3% and 2.2 +/- 1.9% faster after prior heavy and self-selected exercise regimens, respectively, and mean power output was 5.4 +/- 3.6% and 6.0 +/- 5.8% higher, respectively. The overall aerobic contribution ((V) over dot O-2) and oxygen deficit were not different between conditions (similar to 323 +/- 23 and similar to 64 +/- 22 mL.kg(-1), respectively), although (V) over dot O-2 was higher (P < 0.05) in the prior heavy (by 2.1-5.8 mL.kg(-1).min(-1)) and self-selected (2.5-4.3 mL.kg(-1).min(-1)) regimens compared with the control throughout the first half of the time trial. Conclusion: Very high intensity cycling performance was improved after both self-selected and prior heavy exercise. Such priming increased the early aerobic contribution but did not change overall aerobic contribution or oxygen deficit. Thus, athletes seem to manage their energy potential to exploit the available anaerobic capacity, independent of the aerobic contribution. Athletes are advised to perform a bout of heavy exercise as part of their prior exercise regimen.
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