The Impact of an Ultramarathon on Hormonal and Biochemical Parameters in Men

Conclusions Training for and completing the WSER produced a significant suppression in the HPT axis as seen by decreased levels of testosterone and LH. Additionally, running the WSER continued to influence endocrine function until 2 days after the race. Furthermore, the stress caused by the WSER produced severe muscle damage.
Source: Wilderness and Environmental Medicine - Category: Environmental Health Source Type: research