BudgetBarrett
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It is known that exercise increases cortisol which is antagonist to growth hormone (GH), a hormone needed for growth, bone mass, forward growth, etc.Heavy-resistance exercises are found to stimulate markedly acute cortisol responses, similar to those responses found in marathon running. Chronically high levels of cortisol can increase your risk for a variety of health issues, such as sleep disturbances, digestive issues, depression, weight gain, and memory impairment. Excess cortisol also encourages fat gain, particularly around the abdomen.
This study reveals that exercise increases baseline levels of cortisol during certain times of the body's circadian rhythm which in this study was
1. 7am (~upon waking)
2. 7pm (~melatonin production begins)
3. 12pm (~ peak of deep sleep)
However exercise also increases HG as seen in this study.
Above is an image displaying levels of HG in a group's blood after 30 minute excersizes that were performed at 70% of VO2 max. The top group (control) did no excersize and subsequently had a steady but low secretion of GH. However the bottom 2 groups both performed excersized marked by the arrows (only difference was they excersized at different times). Both groups experienced surges in HG.
What can we learn from this?
Obviously you want to time your exercise carefully as to avoid cortisol spikes e.g., dont workout first thing upon waking or right before preparing for bed