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Nice review of the physiologic response to High-intensity intermittent exercise (HIIT).  HIIT is associated with increased catecholamines, cortisol, and HGH.

High intensity training results in effective fat loss.  This study followed individuals over a 12 week cycle.  They performed HIT at 20 mins 3 x weekly.  Fat loss was statistically significant when compared to control group.

another study that shows that High intensity interval training (HIT) results in fat loss.  IN this study, training consisted of 20 minutes 3 x weekly for 12 weeks.  Fat loss in total, abdominal, trunk, and visceral was decreased.  This study only looked at men.

Exercise is key to healthy lifestyle: High Intensity Interval Training for Insulin resistance found to improve waist circumference, systolic bp, and HOMA-IR; Increased non-responders for insulin and glucose in those with mild IR versus severe IR.

Decline in free Testosterone, especially in physically unfit men, blunted by oral 50 mg DHEA night before exercise.  Total Testosterone and DHEA remained significantly low up to 24 hours post HIIT.