Cardio = Waste of time?

[Bulldog_10]

All of the energy you expend running on a track isn't used to propel you forward. Friction is going to geometrically decrease the amount of energy available for motion and transpose it for heat production. If you doubt that motion creates friction and friction creates heat ask why you will sweat in an enviornment less than your body temperature.

Sweating and heat production during exercise has nothing to do with friction. It comes from the fact that muscle contractions are nowhere near 100% efficient. When it breaks the bonds in ATP, I think it is something like 30% (probably less) of that energy that actually goes toward muscle contraction, and the rest is given off as heat...producing increased body temp, producing sweat.

 

[Jacob Creutzfeldt]

Sweating and heat production during exercise has nothing to do with friction. It comes from the fact that muscle contractions are nowhere near 100% efficient. When it breaks the bonds in ATP, I think it is something like 30% (probably less) of that energy that actually goes toward muscle contraction, and the rest is given off as heat...producing increased body temp, producing sweat.

Chemical reactions create heat, but so does friction. Whenever matter is in motion within a system without a vaccuum heat is created. Friction occurs while muscle fibers contract, joint move, and, and even air resistance and molecules moving will create it.

If you look at the way heat builds in a car engine to make an analogy of the human body the combustion (use of fuel) will create heat, but so will the friction caused by motion. Otherwise there would be no need for oil to reduce the heat created by friction. You could avoid engine overheating by just using a radiator and coolant. Drain the oil out of a car, run it, and watch the temperature gauge. I'll bet my left eye that the engine will overheat and cause seizure due to the effects of the heat created.

 

[JG1]

Interval Build-Up Running (IBUR)

JG1, I'd go by feel. If you hit a track, sprint until you have to stop, then walk until you can talk again, then sprint till you have to stop, and walk until you can talk again. I'd do maybe 20 mins of that. As you progress, you will find that the portion of that time tha you can sprint will increase. Then you can start adding in some fun stuff like jog-stride-sprints, parachute sprints, etc..

What do you think of IBUR? I see Christian Thibaudeau recommends this, and was thinking of maybe doing it on Wednesday and Saturday nights (non-training days). This will be in addition to my every day morning cardio session.

Here's what he recommends:

The only thing I'm not sure about is how I'm going to time myself.

 

[spatts]

Re: Interval Build-Up Running (IBUR)

The only thing I'm not sure about is how I'm going to time myself.

Another reason to go by feel.

Conditioning is a factor here too. If you're a beginner, a 70 second sprint can seem like forever. I mean, that's more than a 1/4 mile for me.

There are a million different ways you can organize your intervals, but it's really all designed to accomplish the same thing. I try not to overthink it, and just haul ass.

 

[Jacob Creutzfeldt]

Re: Interval Build-Up Running (IBUR)

What do you think of IBUR? I see Christian Thibaudeau recommends this, and was thinking of maybe doing it on Wednesday and Saturday nights (non-training days). This will be in addition to my every day morning cardio session.

Here's what he recommends:

The only thing I'm not sure about is how I'm going to time myself.

I'm actually going to try a method similar to IBUR. If you want to measure progression and can't time yourself then use distance instead. Keep adding distance to the sprint portion and decrease the distance of the recovery portion.