Progesterone, estrogen, and testosterone affect athletic performance by changing thermoregulation, energy use, tissue growth, recovery, and oxygen transport. However, their effects depend on hormone concentration, biological sex, training status, menstrual status, and individual response.
In inter-system communication, endocrine glands secrete hormones into the blood. Hormones travel to target cells, bind to specific receptors, and alter cellular activity, connecting the endocrine system with the muscular, skeletal, cardiovascular, and nervous systems.
| Hormone | Main physiological effects | Possible performance implications |
|---|---|---|
| Estrogen | Supports bone mineral maintenance, promotes vasodilation, influences collagen metabolism, and can increase fat oxidation while sparing carbohydrate. | May support endurance metabolism and skeletal health. Changes in connective-tissue properties may influence injury risk, although the relationship is complex and individual. |
| Progesterone | Raises resting core temperature after ovulation, stimulates ventilation, and affects fluid regulation. | During the luteal phase, increased body temperature may create greater thermoregulatory strain in hot conditions. Effects on performance are variable rather than universally negative. |
| Testosterone | Increases protein synthesis, muscle hypertrophy, bone formation, and erythropoiesis. It occurs in all sexes but is normally present at higher concentrations in males. | Supports gains in muscle mass, strength, power, recovery, and oxygen-carrying capacity, especially when combined with resistance training. |
Estrogen and progesterone fluctuate across the menstrual cycle, whereas testosterone also varies with sex, age, time of day, training, and recovery. Exercise can itself alter hormone secretion, so the relationship is bidirectional: hormones affect exercise responses, and exercise affects the endocrine system.
A common misconception is that one menstrual-cycle phase always improves or reduces performance. Research shows substantial individual variation, and factors such as sleep, nutrition, temperature, hormonal contraception, and training load may be equally important.
