One workout, whether heavy or high-rep, doesn’t change your testosterone levels in the hours after.
Scientific Claim
Testosterone concentrations are not significantly altered by either high-volume or high-intensity resistance exercise protocols in trained men at any time point up to 72 hours post-exercise.
Original Statement
“Endocrine (testosterone and cortisol)... were assessed at the same time points... cortisol was elevated after HV only; testosterone was not reported as significantly changed.”
Evidence Quality Assessment
Claim Status
appropriately stated
Study Design Support
Design supports claim
Appropriate Language Strength
definitive
Can make definitive causal claims
Assessment Explanation
The claim is supported by the absence of reported significant changes in testosterone, and the RCT design allows definitive conclusions about acute effects.
Evidence from Studies
Supporting (1)
Comparison of the recovery response from high-intensity and high-volume resistance exercise in trained men
The study checked testosterone levels in trained men after two tough workout types and found no change in testosterone at any point up to three days later, which matches the claim exactly.