7/10 Boosts Favorable Hormones
High-intensity interval training does more than just burn calories.
It primes your body for fat loss by creating a favourable metabolic environment. Internally, your body undergoes many hormone changes in response to intense training.
Specifically, HIIT boosts growth hormone and testosterone levels after just 10 minutes, and the amount secreted is correlated to your exercise intensity   .
Growth hormone and testosterone are a potent combo for both fat loss and muscle growth.
Engaging in HIIT will provide you with this amazing benefit which appears to give magical results.
One of my clients, Sandra, was getting a little despondent when after 3 weeks of careful eating and metabolic training sessions at 6:30 am three times a week she hadn’t seen any change in her scale weight.
I’d seen a terrific increase in her fitness level and changes in her body shape, but she couldn’t see it.
I remember her glee when she told me that while walking along a corridor at work the weight of her radio almost pulled her trousers off!
She was ecstatic !! Her body had changed so much she could get her trousers off without undoing the button or zip. She had dropped pounds of fat and built pounds of muscle – so her weight hadn’t really changed but she has reduced 2 dress sizes in about 3 weeks.
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Reference Study 
Home |1992 Archive |July 1992 |Felsing et al. 75 (1): 157
Effect of low and high intensity exercise on circulating growth hormone in men.
N E Felsing, J A Brasel and D M Cooper
– Author Affiliations
Department of Pediatrics, Harbor-UCLA Medical Center, Torrance 90509.
We hypothesized that circulating GH (growth hormone) would increase only if a threshold of work intensity [corresponding to the anaerobic or lactate threshold (LT)] was exceeded. Ten healthy male volunteers (18-35 yr) first performed ramp-type progressive cycle-ergometer exercise to determine the LT and the maximal oxygen uptake. On subsequent mornings after an overnight fast, each subject performed bouts of 1, 5, and 10 min constant work rate exercise of either high intensity (above LT) or low intensity (below LT). A 1-h interval separated exercise bouts. Gas exchange (breath-by-breath), GH, immunoreactive insulin, glucose, lactate, pyruvate, and epinephrine and norepinephrine were measured at regular intervals.
After the 10-min bouts of high compared with low intensity exercise, lactate was 7.2 +/- 3.7 mmol/L vs. 1.4 +/- 1.3, P less than 0.05; epinephrine was 1,113 +/- 519 pmol/L vs. 496 +/- 273, P less than 0.05; and norepinephrine was 7.89 +/- 3.45 nmole/L vs. 2.83 +/- 1.34, P less than 0.05.
GH did not increase significantly from preexercise baseline during low intensity exercise (e.g., GH after 10-min low intensity exercise changed from baseline values by 1.5 +/- 2.0 micrograms/L, NS).
Although lactate was elevated after 5-min of high intensity exercise, peak GH was significantly elevated (mean increase above baseline of 7.7 +/- 2.4 micrograms/L, P less than 0.05) only after 10 min of high intensity exercise (increases in 9 of 10 subjects).
The GH increase occurred despite simultaneous increases in both IRI and glucose.
A minimum duration of 10 min, high intensity exercise consistently increased circulating GH in adult males.