Fasted Hiit

[DrewChan]

As per the title, for those that practice Hiit, I am interested to know in the performance knock between fasted and fed.

This is NOT for fat loss purposes merely want to know:

Fasted:
x "excercise" in x time at x instensity

Fed:
x "excercise" in x time at x instensity


How much difference was there

 

[Rocket-Boy]

There should be quite a big difference.
Fasted state means lowered glycogen stores in your muscles which will definitely impact on any intervals high impact or not.

 

[Deleted member 83147]

I have no idea what you're on about.

I love HIIT, usually do running/agility drills.

Something like sprint the long ends of the field and job the short ends.

Dunno if that helps.

 

[DrewChan]

There should be quite a big difference.
Fasted state means lowered glycogen stores in your muscles which will definitely impact on any intervals high impact or not.

Thanks rocket.

 

[Kalle]

you got to be careful, because when all your glycogen stores are empty and you keep going you'll start to burn muscles.

 

[Ancalagon]

you got to be careful, because when all your glycogen stores are empty and you keep going you'll start to burn muscles.

That is true, but apparently some studies show that because your muscles are stressed more, the growth response is better. In other words, it leads to more muscle growth over time.

Try it out and see if it works for you.

 

[HavocXphere]

you got to be careful, because when all your glycogen stores are empty and you keep going you'll start to burn muscles.

Should be burning fat before muscle if memory serves. So unless you're running a dangerously low body fat % I don't see a problem.

 

[TheBadMadMan]

I love to work out fasted.
Some days I do weightlifting HIIT, litte to no rest light to medium weight, full body workouts (Think of a constant super-set). Feels amazing and gets my blood flowing real nice. I do go easy on my legs when I do a full body session though. If i go all out on legs I am tired and drained as fark!

 

[HavocXphere]

HIIT, litte to no rest light to medium weight, full body workouts (Think of a constant super-set).

I might be mistaken here but that sounds decidedly not HIIT?

 

[Ancalagon]

Should be burning fat before muscle if memory serves. So unless you're running a dangerously low body fat % I don't see a problem.

As far as I understand, at the energy levels required for HIIT, the body is not able to break down fat fast enough to supply you with energy. So it breaks down muscle instead, which can be broken down faster but is considered an emergency supply of energy. If you fast without HIIT, the body preferentially breaks down fat and leaves muscle alone as much as possible. But if you do fasted exercise, the body has no choice but to break down muscle, because you have run out of glycogen.

Nonetheless, according to studies, this is not as bad as it sounds, because the extra stress makes your muscles grow more in response.

Could be wrong, just what I have gathered.

 

[TheBadMadMan]

I might be mistaken here but that sounds decidedly not HIIT?

For me Interval means go all out then take it easy, then all out, then take it easy. Rest is optional as needed for me. The whole point of cardio is to get your heart rate up and to keep it there.

 

[Kalle]

That is true, but apparently some studies show that because your muscles are stressed more, the growth response is better. In other words, it leads to more muscle growth over time.

Try it out and see if it works for you.

Perhaps if you're a professional athlete; didn't work for me though. I've lost some muscle mass with this kind of training; accordingly to my body fat / muscle mass scale.