Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2005) 04, 437 - 445

Research article
Physiological Responses to 90 s All Out Isokinetic Sprint Cycling in Boys and Men
Helen Carter1, , Jeanne Dekerle1, Gary Brickley1, Craig A. Williams2
Author Information
1 Chelsea School Research Centre, University of Brighton, Gaudick Road, Eastbourne, UK
2 Children’s Health and Exercise Research Centre, School of Sport and Health Sciences, University of Exeter, Exeter, UK

Helen Carter
✉ University of Brighton, Chelsea School, Gaudick Road, Eastbourne, BN20 7SP, England
Email: h.carter@bton.ac.uk
Publish Date
Received: 08-06-2005
Accepted: 08-09-2005
Published (online): 01-12-2005
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ABSTRACT

The purpose of this study was to compare the VO2 kinetic and mechanical power responses of boys and men to all out 90 s sprint cycle exercise. Eight boys (14.6 ± 0.3 y) and eight men (33.8 ± 6.5 y) volunteered to participate and completed a ramp test (to determine VO2peak and ventilatory threshold, VT) and then on subsequent days, two 90 s all out cycle sprints on an isokinetic cycle ergometer. During each test, breath-by-breath pulmonary gas exchange and power output were measured. Parameters from the power output profiles were derived from the average response of the two tests including peak power (PP, highest power output in 1 s), end power (EP60-90, power over the last 30 s), and mean power over the 90 s (MP90). Independent pairwise and dependent t-tests were used to compare the data from tests between adults and boys subject groups. Significant differences between adults and boys were found for absolute PP (881.4 ± 60.7 vs 533.6 ± 50.7 W), EP60-90 (288.6 ± 25.7 vs 134.3 ± 17.6 W) and MP90 (434.5 ± 27.4 vs 238.4 ± 17.3 W, p =0.001) respectively. Relative to body mass significant differences between adults and boys were found for EP60-90, MP90 and total work (p < 0.002). The boys attained 90 s VO2 values that were closer to VO2peak than their adult counterparts (93.3 ± 2.6 vs 84.9 ± 2.3 %, p = 0.03). They also demonstrated faster VO2 kinetics (10.8 ± 1.5 vs 17.6 ± 1.0 s, p < 0.01). In conclusion, during all out 90 s cycle sprinting boys were able to attain VO2 values that were closer to VO2peak and a faster time constant than adult men. These findings provide insight into the contribution and speed of response of the aerobic system during an ‘anaerobic’ test.

Key words: VO, anaerobic, kinetics, aerobic, ergometry


           Key Points
  • The results of this study confirm the significant contributions of the aerobic energy systems during so called ‘anaerobic tests’.
  • Boys were able to attain VO values from an all out 90 s sprint cycle that were closer to their aerobic VO peak test than adults. More detailed studies are required to investigate the limiting factors that prevent VO peak being reached in an all out sprint cycle.
  • All out tests of a duration > 30 s and coupled with gas and power analyses offer paediatric physiologists considerable scope to examine the contributions of the anaerobic and aerobic energy systems until more ethically viable methods are found.
 
 
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