T Nation

Endurance Training and Growth Hormone

Is it true that endurance training causes high secretions of growth hormone, and that the more intensive the training the greater the secretions?

[quote]Bull_Scientist wrote:
Is it true that endurance training causes high secretions of growth hormone, and that the more intensive the training the greater the secretions?[/quote]

If you mean endurance like ‘marathon/iron-man’ stuff…no.
If you mean endurance like full depth squats for twenty reps with twice your body weight…yes.

blue collar is spot on man. endurance activities such as marathons have a deleterious effect on hypertrophy - LOok at distance runners and you will know exactly what I mean - They look like theyve been on crack or meth"haha . However those activities that require your muscles to operate at a high intensity for a duration of upto around 45 seconds lead to muscular growth /hypertrophy because of a number of factors which include 1- mechanical stress 2-the secretion of hgh (human growth hormone0 because hgh secretion tends to peak when the accumulation of lactic acid takes place- As an example look at 400metre sprinters and you can see that whilst they do not possess the same level fo bulk as their 100 and 200m counter parts they never the less have muscular and impressive physiques-