Sprinting, Leptin, and Testosterone

so guys…bare with me… so i saw studies showing that bouts of sprinting especially fasted increases leptin which help burn fat…but also saw a study which showed leptin blunts testosterone… does surly one of these studies must be flawed?

Where is the study that show leptin blunts testosterone?

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I think that the amount testosterone may be blunted by sprinting is such a tiny amount that its not worth worrying about at all. Anyways being fat is going to be far worse for testosterone than the sprinting to get lean is.

http://jcem.endojournals.org/content/83/9/3243.full

[quote]AntonioFlores wrote:
so guys…bare with me… so i saw studies showing that bouts of sprinting especially fasted increases leptin which help burn fat…but also saw a study which showed leptin blunts testosterone… does surly one of these studies must be flawed? [/quote]

Why must one study be flawed?

how can something increase and deacrease something at the same time??

[quote]AntonioFlores wrote:
how can something increase and deacrease something at the same time??[/quote]

??

Your OP says that the two conflicting ideas are

  1. Sprinting increases leptin which increases fat burning
  2. Leptin and testosterone are inversely correlated

There is no contradiction there.

As to the study you posted, I read the results and all it shows is an extremely weak negative correlation between leptin and test in the old guys. It is purely observational and IMO the results are certainly not conclusive. (Adjusted Pearson correlation r= -0.26 )

interesting research and topic

there’s also the “nevermind the why” reason to continue actually sprinting as we continue to learn more (when improving lean-mass ratio is among the goals)