Letters Section Editor: Stephen J. Lurie,
MD, PhD, Senior Editor.
In Reply: I agree with Drs Ritt and Lechleitner
that exercise may have a significant impact on fat-free mass. However, in
our study we were attempting to examine exercise intensity while holding exercise
volume constant. Therefore, it is possible that exercise intensity does not
have differential effects on body weight or body composition when total exercise
volume is held constant. Our results are consistent with the findings of the
study published by Duncan et al1 who found
no difference in body composition with varying intensities of exercise when
exercise volume was held constant across the different intensities. Moreover,
based on our review of the literature, a reduction of energy intake of 500
to 1000 kcal/d combined with increased exercise intensity is not consistently
related to increases in fat-free mass, irrespective of either endurance or
resistance forms of exercise.2 Thus, our
findings appear to be consistent with the majority of clinical trials. However,
I agree that body composition data may provide additional insight into the
potential mechanism by which exercise plays a role in the management of body
Jakicic JM. Effect of Exercise Intensity on Body Composition—ReplyEffect of Exercise Intensity on Body Composition—Reply. JAMA. 2003;290(23):3069. doi:10.1001/jama.290.23.3069-a
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