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new study slated to be published in the American Journal of
Applied Physiology examined the relationship between energy
expenditure (in kcal) and epinephrine (Epi), norepinephrine
(NE), and growth hormone (GH) release.
This study
provided very important data on training intensity and its effect
on energy expenditure during training and during recovery. This
study showed that carbohydrate
(CHO) expenditure during exercise and fat expenditure during
recovery rose proportionately to increasing exercise intensity
(P = 0.002).
Fat expenditure
during exercise and CHO expenditure during recovery
were not affected by exercise intensity.
The relationship
between exercise intensity and CHO expenditure during exercise
could not be explained by either Epi (P = 1.00) or NE (P = 0.922),
whereas fat expenditure during recovery increased Epi and GH
independently of exercise intensity (P = 0.028). When Epi and
GH were regressed against fat expenditure during recovery, only
GH remained statistically significant (P < 0.05).
This study
concludes that a positive relationship exists between exercise
intensity and both CHO expenditure during exercise and
fat expenditure during recovery, and that the increase
in fat expenditure during recovery with higher exercise intensities
is related to GH release.
An increased
level of exercise intensity has a direct effect on the increase
in fat expenditure during recovery after exercise. The greater
the intensity you train with the more efficient your body becomes
at burning fat during rest.
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