First Thing You Need To Know
The nervous system
Recruitment and the ‘all or none law’
Which of the following would increase the intensity or duration of a muscular contraction?
Neuromuscular adaptations to exercise
The endocrine system
How hormones work
Growth and thyroid hormones
The remaining two hormones we’re going to look at are primarily driven by the pituitary gland. They are the ‘growth hormone’ and the ‘thyroid hormones’.
Growth hormone is released directly from the pituitary gland and stimulates growth in all areas of the body. In particular, growth hormone drives bone growth during puberty, but it also stimulates protein synthesis in muscle tissue and helps break down and release fat tissue from storage sites around the body for oxidation.
The thyroid hormones are not released directly from the pituitary, but from the thyroid gland located in the upper chest. But, it is secretions from the pituitary that stimulate the thyroid gland to release important thyroid hormones. They help to regulate several processes; including the use of oxygen in producing cellular energy, the maintenance of body temperature and overall metabolic rate.
Both growth and thyroid hormones have a very broad influence on the way the body operates and maintains good health. So it’s vital that they are kept at the correct levels in the body.
Glands and hormones
FYI : Cortisol helps break down and release glucose and stored fats for use under stressful conditions such as exercise. Glucagon helps release stored glucose from the liver if blood glucose drops too low. Low blood glucose can often occur during exercise, especially if adequate food has not been ingested prior to the activity. The other hormones may all justifiably have some involvement around exercise, but they are not directly responsible for the release of stored energy.
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