Effect of hydration state on resistance exercise-induced endocrine markers of anabolism, catabolism, and metabolism. Judelson et al. J Appl Physiol 105: 816-824, 2008.
This study looked at the hormonal effect of being in an acute dehydrated state post-exercise following a resistance training workout. Before we get into the findings let me explain the post-exercise period. The post-exercise period is the most anabolic period with the most potential to increase fat free mass (muscle tissue). If this period is compromised your metabolism will not be increased to its full potential, which will decrease your fat burning potential. (This explanation is very simply and vague, but it will due for this article.)
Here are the findings of the study:
1. Increased levels of cortisol (a catabolic hormone) = decreased fat free mass (muscle tissue) =
decreased metabolism = decreased caloric expenditure and potential for increased body fat.
2. Decreased levels of testosterone = decreased fat free mass building potential = decreased total amount of fat free mass and less of an increase in metabolism stimulation = decreased caloric expenditure.
The take home message is: If your fitness goal is to lose weight (body fat) by being in a dehydrated state you decrease your fat burning potential.
Drink your water!
Live Fit,
Josh
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