HETTINGA, FLORENTINA J and DE KONING, JOS J and BROERSEN, FRANK T and VAN GEFFEN, PAUL and FOSTER, CARL (2006) Pacing Strategy and the Occurrence of Fatigue in 4000-m Cycling Time Trials. Medicine & Science in Sports & Exercise, 38 (8). pp. 1484-1491. DOI https://doi.org/10.1249/01.mss.0000228956.75344.91
HETTINGA, FLORENTINA J and DE KONING, JOS J and BROERSEN, FRANK T and VAN GEFFEN, PAUL and FOSTER, CARL (2006) Pacing Strategy and the Occurrence of Fatigue in 4000-m Cycling Time Trials. Medicine & Science in Sports & Exercise, 38 (8). pp. 1484-1491. DOI https://doi.org/10.1249/01.mss.0000228956.75344.91
HETTINGA, FLORENTINA J and DE KONING, JOS J and BROERSEN, FRANK T and VAN GEFFEN, PAUL and FOSTER, CARL (2006) Pacing Strategy and the Occurrence of Fatigue in 4000-m Cycling Time Trials. Medicine & Science in Sports & Exercise, 38 (8). pp. 1484-1491. DOI https://doi.org/10.1249/01.mss.0000228956.75344.91
Abstract
Purpose: The present study was designed to examine the role of central and peripheral fatigue on 4000-m cycling time trial performance by comparing changes in power output and integrated electromyography (iEMG) in differently paced maximal efforts. Methods: Eight well-trained men performed three randomly ordered time trials with different pacing strategies, in which the first 2000 m were manipulated to evoke an increasing, even, and decreasing power output profile (SUB, EVEN, and SUPRA, respectively). Subjects were instructed to finish the last 2000 m of all trials in the shortest time possible. iEMG of the rectus femoris (RF), vastus lateralis (VL), and biceps femoris (BF) muscle, mechanical power output, and gas exchange variables were measured. Anaerobic and aerobic contributions to mechanical power output were calculated from gas exchange data. Results: The increase in mechanical power output during the SUB time trials was always associated with an increase in iEMG in all muscles. A decrease in mechanical power output near the end of the time trials was also marked by an increase in iEMG for all muscles, except for the RF. Comparing the last 2000-m interval with the first, aerobic power output increased for all strategies. Anaerobic power output increased in SUB and decreased in EVEN and SUPRA. Conclusion: The relationship between iEMG and mechanical power output pattern was consistent with peripheral fatigue rather than central downregulation of mechanical power output. Specifically, anaerobic energy resources seem to be important in regulating pacing strategy. Copyright © 2006 by the American College of Sports Medicine.
Item Type: | Article |
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Uncontrolled Keywords: | energy distribution; anaerobic power; aerobic power; central fatigue; iEMG; power output |
Subjects: | R Medicine > RC Internal medicine > RC1200 Sports Medicine |
Divisions: | Faculty of Science and Health Faculty of Science and Health > Sport, Rehabilitation and Exercise Sciences, School of |
SWORD Depositor: | Unnamed user with email elements@essex.ac.uk |
Depositing User: | Unnamed user with email elements@essex.ac.uk |
Date Deposited: | 03 Feb 2015 14:20 |
Last Modified: | 07 Aug 2024 20:27 |
URI: | http://repository.essex.ac.uk/id/eprint/8284 |