Exhaustive endurance exercise such as cycling has been shown to decrease testosterone levels for up to 72 hours after exercise . Cortisol (a glucocorticoid hormone) increases during endurance exercise, while testosterone (an anabolic-androgenic steroid hormone) decreases and this may attenuate muscle-building after an exhaustive endurance session.
 Anderson, T., Lane, A. R., & Hackney, A. C. (2016). Cortisol and testosterone dynamics following exhaustive endurance exercise. European journal of applied physiology, 116(8), 1503–1509. https://doi.org/10.1007/s00421-016-3406-y