Physical activity interventions: Effects of duration and intensity
Buchan, Duncan S.
Thomas, Non E.
Malina, Robert M.
Baker, Julien S.
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The purpose of this study was to examine the effects of exercising at different intensities over 7 weeks on components of physical fitness and CVD risk factors. Forty-seven boys and 10 girls, (16.4±0.7 years of age) were divided into a moderate, high intensity, or a control group. All participants had indices of obesity and blood pressure recorded in addition to four physical performance measures pre- and post-intervention. In addition, the intervention groups repeated the physical performance measures at the 4th week phase of the intervention. Following the intervention, significant improvements (P<0.05) in the high-intensity group were found in the 20 MSFT, agility, CMJ and 10 m sprint post-intervention. Participants in the moderate intensity group displayed significant improvements (P<0.05) in both the CMJ and 20 MSFT post-intervention. Body fat % significantly improved (P<0.01) in the moderate group only post-intervention. Interestingly, Systolic blood pressure significantly improved post-intervention (112±10 vs 106±11 mmHg) (P=0.017) in the high intensity group. In conclusion, high-intensity exercise over 7 weeks is a very time efficient means of improving important components of physical fitness in adolescents.
Scandinavian Journal of Medicine and Science in Sports
Buchan, D.S., Ollis, S., Thomas, N.E., Buchanan, N., Cooper, S.M., Malina, R.M. and Baker, J.S. (2011) 'Physical activity interventions: effects of duration and intensity', Scandinavian Journal of Medicine & Science in Sports, 21(6), pp.e341-e350.
This article was published in Scandinavian Journal of Medicine and Science in Sports on 25 April 2011 (online), available at http://dx.doi.org/10.1111/j.1600-0838.2011.01303.x
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