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Thread: Study: max calorie and fat "burning"

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    God/dess Will's Avatar
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    Default Study: max calorie and fat "burning"

    A bit of a "no duh" study to me, but steady state aerobics with sprints added (four-second maximal sprints every two minutes) was superior to steady state on all measures in both groups.

    Metabolism. 2012 Apr 3.

    Adding sprints to continuous exercise at the intensity that maximises fat oxidation: Implications for acute energy balance and enjoyment.

    Crisp NA, Fournier PA, Licari MK, Braham R, Guelfi KJ.

    Abstract

    The objective was to examine the effect of adding sprints to continuous exercise at the intensity that maximises fat oxidation (Fat(max)) on energy expenditure, substrate oxidation, enjoyment and post-exercise energy intake in boys. Nine overweight and nine normal weight boys (8-12 years) attended the laboratory on three mornings.

    First, body anthropometrics, peak aerobic capacity and Fat(max) were assessed. On the remaining two sessions, resting metabolic rate was determined before participants completed 30 min of either continuous cycling at Fat(max) (MOD) or sprint interval exercise consisting of continuous cycling at Fat(max) interspersed with four-second maximal sprints every two minutes (SI). Energy expenditure and substrate oxidation were measured during exercise and for 30 min post-exercise, while participants completed a modified Physical Activity Enjoyment Scale (PACES).

    This was followed by a buffet-like breakfast to measure post-exercise energy intake. Fat oxidation rate was similar between groups and protocols (P>0.05). Both groups expended more energy with SI compared to MOD, resulting from increased carbohydrate oxidation (P<0.05), which was not compensated by increased energy intake.

    Participants indicated that they preferred SI more than MOD, although there was no significant difference in PACES score between the protocols (P>0.05).

    In summary, the addition of short sprints to continuous exercise at Fat(max) increased energy expenditure without compromising fat oxidation or stimulating increased post-exercise energy intake. The boys preferred SI and did not perceive it to be any harder than MOD, indicating that sprint interval exercise should be considered in exercise prescription for this population.

    http://www.ncbi.nlm.nih.gov/pubmed/22480984
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    Default Re: Study: max calorie and fat "burning"

    Good info Will, could you take the same approach with a treadmill & heavy incline every 2 minutes for increase heart rate back to steady fat max & achieve the same result?

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    God/dess Will's Avatar
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    Default Re: Study: max calorie and fat "burning"

    Quote Originally Posted by unbeleavable View Post
    Good info Will, could you take the same approach with a treadmill & heavy incline every 2 minutes for increase heart rate back to steady fat max & achieve the same result?
    You can't really sprint on a treadmill as they are too slow to respond in terms of speeding up and slowing down. Only works on things you can speed up and slow down quickly, like stationary bike, running on a track, etc. The max effort was only 4 seconds long and a treadmill takes that long just to get up to speed, alter incline, etc. Favorite machine for this type of thing is a stair stepper type machine, but that's a level tougher then the stationary bike used in this study as untrained kids wouldn't survive that on a stair stepper.
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    Default Re: Study: max calorie and fat "burning"

    Thanks!

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    Default Re: Study: max calorie and fat "burning"

    Quote Originally Posted by ShelleyPaige View Post
    Thanks!
    Get you some!
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