Can HIIT increase LBM?

[JudoJosh]

it appears so

Acute Exercise-Induced Growth Hormone is Attenuated in Response to Short-Term, High-Intensity Exercise Training

ABSTRACT

The aim of this study was to determine if 3-wks of short-term, high-intensity exercise training (HIT) alters growth hormone (GH) release. Nineteen recreationally active males (Mean ± SD) (age = 24.9 ± 3.9 yrs, BF% = 20.1 ± 7.7) participated in this study. Each subject completed a 2-hr resting profile and a 2-hr acute sprint (AS) profile that consisted of one maximal 30-sec Wingate sprint on a cycle ergometer after 30 min of rest. Blood samples were taken every 15 min [Q15] during rest and more frequently [Q1-Q10] immediately following the sprint. Short-term, HIT consisted of 4-6 repetitions of 30-sec maximal sprints relative to body mass, 3 times•wk-1 with an additional AS profile at the end of each week of training for 3 wks. Peak power (PP) and fatigue index (FI) significantly increased while mean power (MP), minimum power (MinP), time to peak power (TTPP), and total work per sprint (TW) were unchanged after 3 wks of HIT. Total body mass significantly increased and was confirmed by a significant increase in lean mass of the lower extremities. Growth hormone area under the curve (AUC) and peak GH were significantly decreased after the first week of HIT despite no change in time to reach peak GH. One week of HIT significantly decreased GH release, with a simultaneous significant increase in anaerobic power and lean body mass of the lower extremities.

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TL;DR notes

Population - 19 active males in their mid 20's(ish)
Protocol - "The first 3 training sessions consisted of four 30-sec repetitions at 7.5% body mass with 4 min of active recovery at 50 W between each repetition. Training sessions 4 to 6 (wk 2) consisted of 5 repetitions, and sessions 7 to 9 (wk 3) consisted of six 30-sec maximal repetitions. During each repetition, each subject was encouraged verbally to provide maximal effort"
Duration - 3 weeks
Body composition outcome - +1% lbm, +3% leg lbm, -1% body fat

 

[jgntyce]

Nothing better than empirical, evidence based research!

 

[pyrobatt]

it appears so

*FT attached* -> <img src="http://anabolicminds.com/forum/attachment.php?attachmentid=111142"/>

TL;DR notes

Population - 19 active males in their mid 20's(ish)
Protocol - "The first 3 training sessions consisted of four 30-sec repetitions at 7.5% body mass with 4 min of active recover at 50 W between each repetition. Training sessions 4 to 6 (wk 2) consisted of 5 repetitions, and sessions 7 to 9 (wk 3) consisted of six 30-sec maximal repetitions. During each repetition, each subject was encouraged verbally to provide maximal effort"
Duration - 3 weeks
Body composition outcome - +1% lbm, +3% leg lbm, -1% body fat

Good cause I decided to take another look. Boxing, jump rope, hammer swings and tire flips. Yay high intensity training.

 

[Swolbraham]

Interesting. It makes sense it would do so, look at sprinters legs lol

 

[RecompMan]

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[kisaj]

Interesting. It makes sense it would do so, look at sprinters legs lol

I came in just to mention this. Look at a sprinter build and these guys are stacked. Also, I play rugby with some guys that only train HIIT and are incredibly built. They are the reason I added it in years ago.

 

[jgntyce]

I came in just to mention this. Look at a sprinter build and these guys are stacked. Also, I play rugby with some guys that only train HIIT and are incredibly built. They are the reason I added it in years ago.

Leave it to Black Lion to say it right! Cheers!