In the state of exercise stress, sympathetic nerve is excited and parasensory is inhibited, so the hormone secretion controlled by sympathetic nerve is increased to some extent.

Adrenal medulla is dominated by sympathetic nerve, which mainly secretes catecholamine, mainly adrenaline. This is an emergency exercise. If it is a long-term and high-intensity exercise, the following hormones will also increase. These hormones will help to change the exercise ability or adjust the internal environment changes caused by exercise. Hormones that help to accelerate energy metabolism and mobilize the body's potential, such as glucocorticoid, adrenocorticotropic hormone, growth hormone, etc. Regulating homeostasis, such as antidiuretic hormone and aldosterone; Glucagon regulates blood sugar function.

But when it comes to short-term acute exercise, it is mainly catecholamine.

In fact, you can search for stress response and emergency response, which should be helpful.

Let's start with muscle strength. Muscle strength is due to the activity of muscle cells. Nerves transmit impulses to neuromuscular junctions, release neurotransmitters (acetylcholine) at the synaptic terminals, generate synaptic potentials, and then generate motion. In this process, the release of transmitters and the excitability of muscle cells can affect the degree of strength. The amount of transmitter released is the degree of excitement of your nerves. Since it is gravity, the impulse from your nerve center is naturally stronger. Then there is the excitability of muscle cells, which is the hormone secretion mentioned in your question.

Hormone secretion increases muscle contractility by affecting the excitability of muscle cells. For example, adrenaline can increase the contractility of muscle cells by interacting with adrenergic receptors on the cell surface and increasing the concentration of intracellular Ca ions through intracellular signal transduction.

By the way, hormone secretion seems to be imperceptible. . If you feel it, it will really become a god. . Because it is continuously secreted by glands, and there are really few sensory nerves on the glands. .

The hymn answered the question for the first time. Forgive my imperfection. .