Close







logotop.gif
 
Home
blank.gif
Free DVD
blank.gif
Q & A
blank.gif
Leap of Faith
blank.gif
Studies
blank.gif
Articles
blank.gif
Testimonials
blank.gif
Warranty
blank.gif
Delivery-Specs
blank.gif
Order Machine
blank.gif
Related Topics

BBB OnLine

Romfab
Factory Showroom
Opening hours:
Weekdays 9am-5pm
and sometimes by
special arrangement
on Saturday and
during after-hours.

8140 Webb Ave.
North Hollywood,
California 91605 USA
Sales@FastExercise.com
Phone:  (818) 787-6460
Fax: (818) 301-0319

AMAZON-E9B6E807

em yt tw fb
The "experts" are finally catching on to what we tried to tell them about ROM hiit way back in 1990.
   
The time course of the human growth hormone response to a 6 s and a 30 s cycle ergometer sprint.

Stokes KA, Nevill ME, Hall GM, Lakomy HK.

Department of Physical Education, Sports Science and Recreation Management, Loughborough University, UK.

Exercise is a potent stimulus for the release of human growth hormone (hGH), but the time course of the hGH response to sprint exercise has not been studied. The aim of the present study was to determine the time course of the hGH response to a 6 s and a 30 s maximal sprint on a cycle ergometer. Nine males completed two trials, on one occasion performing a single 6 s sprint and on another a single 30 s sprint. They then rested on a couch for 4 h while blood samples were obtained. Three of the participants completed a further control trial involving no exercise. Metabolic responses were greater after the 30 s sprint than after the 6 s sprint. The highest measured mean serum hGH concentrations after the 30 s sprint were more than 450% greater than after the 6 s sprint (18.5 +/- 3.1 vs 4.0 +/- 1.5 microg l(-1), P < 0.05). Serum hGH also remained elevated for 90-120 min after the 30 s sprint compared with approximately 60 min after the 6 s sprint. There was a large inter-individual variation in the hGH response to the 30 s sprint. In the control trial, serum hGH concentrations were not elevated above baseline at any time. It would appear that the duration of a bout of maximal sprint exercise determines the magnitude of the hGH response, although the mechanism for this is still unclear.