אימונים Run Sprint Interval Training Improves Aerobic Performance but Not Max Cardiac Output.

[Mike Bikov]

Med Sci Sports Exerc. 2010 May 13. [Epub ahead of print]
Run Sprint Interval Training Improves Aerobic Performance but Not Max Cardiac Output.

Macpherson RE, Hazell TJ, Olver TD, Paterson DH, Lemon PW.

1 Exercise Nutrition Research Laboratory, The University of Western Ontario, School of Kinesiology, Faculty of Health Sciences, London, ON N6A 3K7 2 Centre for Activity and Aging, The University of Western Ontario, School of Kinesiology, Faculty of Health Sciences, London, ON N6A 3K7.
Abstract

Repeated maximal intensity, short duration exercise (sprint interval training, SIT) can produce muscle adaptations similar to endurance training (ET) despite a much reduced training volume. However, most SIT data utilize cycling and little is known about its effects on body composition or maximal cardiac output (Qmax). PURPOSE:: To assess body composition, 2000m run time trial, VO2max, and Qmax effects of run SIT vs ET. METHODS:: Men and women (n=10 per group; 24+/-3 y) trained 3.wk for 6 wk with SIT: 30 sec all-out run sprints (manually driven treadmill), 4-6 bouts.session, 4 min recovery/bout vs ET: 65% VO2max for 30-60 min.d. RESULTS:: Training improved (p<0.05) body composition, 2000m run time trial performance, and VO2max in both groups. Fat mass decreased 12.4% with SIT (13.7+/-1.6 to 12.0+/-1.6 kg) and 5.8% with ET (13.9+/-1.7 to 13.1+/-1.6 kg; mean+/-SEM). Lean mass increased 1% in both groups. Time trial performance improved 4.6% with SIT (-25.6+/-8.1 sec) and 5.9% with ET (-31.9+/-6.3 sec). VO2max increased 11.5% with SIT (46.8+/-1.6 to 52.2+/-2.0 ml.kg..min) and 12.5% with ET (44.0+/-2.0 to 49.5+/-2.6 ml.kg.min). None of these improvements differed between groups. In contrast, Qmax increased by 9.5% with ET only (22.2+/-2.0 to 24.3+/-1.6 L.min). CONCLUSION:: Despite a fraction of the time commitment, run SIT induces similar body composition, VO2max, and performance adaptations as ET, but with no effect on Qmax. These data suggest that adaptations with ET are of central origin primarily whereas those with SIT are more peripheral.​

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