Anatomy Crisis!

Training Bodybuilding
1

hi all i have an assessment due very soon and i’m having problems with a couple questions. The first one is -
If an endurance client does 3 sets of 30 reps of bench press with a light weight and the total set time is 60 seconds, explain which energy systems dominate.

Include in you answer the words: light weight, moderate amount of energy per second, intermediate fast twitch fibres, slow twitch fibres, smaller motor nerves, smaller motor units, phosphate energy system, lactate or lactic acid energy system, aerobic energy sytem.

This is my reponse to the question. Any corrections will be appreciated.

When an endurance client uses the bench press with light weight the phosphate system begins as the major energy system. As the weight is light the client�??s body will realise that it doesn�??t need the large amounts of energy produced by the phosphate system. The lactic acid energy system will kick in and dominate and produce a moderate amount of energy per second. The client�??s intermediate fast twitch fibres are heavily used although towards the end of the set the slow twitch fibres are also used. The smaller motor nerves will innervate smaller motor units for the exercise. The aerobic energy system is used towards the end of the set as intensity gradually drops.

Thx.

3

Crisis? Really? This is a CRISIS?

I thought it was ATP-CP first, then aerobic until you run out of oxygen, then only glycolysis to lactic acid. Isn’t that why your muscle maintains a store of ATP and CP? Then begins producing ATP aerobically until oxygen levels decrease?

It’s been last semester since I had that stuff, but I think that’s the way it goes.

I agree that slow twitch should dominate unless the athlete performs reps faster at first then slows later, if this is even necessary. It’s light weight, right? Should be mostly slow twitch.

4

[quote]AlteredState wrote:
Well this is a physiology question, not an anatomy one, lol.

I would suggest that it is the slow twitch fibers that are used first followed by the intermediate fibers.

The lactic acid system dominates with the aerobic system next and the ATP-CP system least utilised.[/quote]

Oh it is isn’t it. The Assessment says its an anatomy application. lol.
When are the intermediate fast twitch fibres and slow twitch fibres utilised and why? Sorry for my lack of knowledge but this is the second week of school and my book doesn’t have a whole lot of info about muscle fibre types.
Oh and thx for the help.

5

[quote]futurepharm wrote:
Crisis? Really? This is a CRISIS?

I thought it was ATP-CP first, then aerobic until you run out of oxygen, then only glycolysis to lactic acid. Isn’t that why your muscle maintains a store of ATP and CP? Then begins producing ATP aerobically until oxygen levels decrease?

It’s been last semester since I had that stuff, but I think that’s the way it goes.

I agree that slow twitch should dominate unless the athlete performs reps faster at first then slows later, if this is even necessary. It’s light weight, right? Should be mostly slow twitch.

[/quote]

Haha yer its not really a crisis but at least it got your attention.
I get you on the ATP-CP system first. But i don’t understand what you mean by running out of oxygen. How does the body cope with no oxygen.
This stuff is driving me nuts. !@#$!$%!
thx for your help though.

6

[quote]un33q wrote:
futurepharm wrote:
Crisis? Really? This is a CRISIS?

I thought it was ATP-CP first, then aerobic until you run out of oxygen, then only glycolysis to lactic acid. Isn’t that why your muscle maintains a store of ATP and CP? Then begins producing ATP aerobically until oxygen levels decrease?

It’s been last semester since I had that stuff, but I think that’s the way it goes.

I agree that slow twitch should dominate unless the athlete performs reps faster at first then slows later, if this is even necessary. It’s light weight, right? Should be mostly slow twitch.

Haha yer its not really a crisis but at least it got your attention.
I get you on the ATP-CP system first. But i don’t understand what you mean by running out of oxygen. How does the body cope with no oxygen.
This stuff is driving me nuts. !@#$!$%!
thx for your help though.

[/quote]

Buy a college level biology book then. If you don’t understand how your body can work anaerobically, it means you need to learn the basics of how your body works…instead of simply asking individual questions at every turn while missing the big picture. That would be how you stop driving yourself “nuts”.

Look up “lactic acid” and “anaerobic resistance training”

7

To be fair, Prof, this wasn’t covered until the first semester of A&P, at least in the books we used, and they really glossed over all of the slow, intermediate, and fast-twitch stuff. I read it because I was interested, and may need it later.

For the cliffs notes version, your muscles keep a small supply of ATP on hand, and keeps extra phosphate for ATP production as creatine phosphate, CP. When that runs out, you have to create more ATP, because the muscles won’t relax without it.

The ideal pathway for ATP production is glycolysis followed by the TCA cycle and Electron Transport Chain in the mitochondria. This requires oxygen, and is called aerobic respiration. By the way, glycolysis does not require oxygen, and is called anaerobic respiration. In the absence of oxygen, the only way to make energy is glycolysis, which produces lactic acid as a byproduct.

So it’s ATP-CP first, aerobic respiration second, anaerobic third, but remember that anaerobic is the first step of aerobic until you run low on oxygen.

And you don’t run out of oxygen, per se, but rather you can’t get enough oxygen to the muscles fast enough to get to aerobic respiration.

8

[quote]futurepharm wrote:
To be fair, Prof, this wasn’t covered until the first semester of A&P, at least in the books we used, and they really glossed over all of the slow, intermediate, and fast-twitch stuff. I read it because I was interested, and may need it later.

For the cliffs notes version, your muscles keep a small supply of ATP on hand, and keeps extra phosphate for ATP production as creatine phosphate, CP. When that runs out, you have to create more ATP, because the muscles won’t relax without it.

The ideal pathway for ATP production is glycolysis followed by the TCA cycle and Electron Transport Chain in the mitochondria. This requires oxygen, and is called aerobic respiration. By the way, glycolysis does not require oxygen, and is called anaerobic respiration. In the absence of oxygen, the only way to make energy is glycolysis, which produces lactic acid as a byproduct.

So it’s ATP-CP first, aerobic respiration second, anaerobic third, but remember that anaerobic is the first step of aerobic until you run low on oxygen.

And you don’t run out of oxygen, per se, but rather you can’t get enough oxygen to the muscles fast enough to get to aerobic respiration.

[/quote]

…creating an “Oxygen Debt”.

I researched this shit on my own as well, but the initial basics were laid in a real classroom. I get the feeling some of these guys are trying to bypass laying down that foundation of knowledge.

It simply can not work that way. You either become one of the educated that people go to for help, or you remain one of the people who needs others to help them all of the time.

9

Well, I agree with that totally. It would have taken less time to google the answer to his question than it did to type it into this forum.

But once he got some wrong info, I felt the need to try to correct the record.

And I agree that learning’s pretty important, that’s why I’m starting a Pharm.D at 33.

10

[quote]futurepharm wrote:

And I agree that learning’s pretty important, that’s why I’m starting a Pharm.D at 33.

[/quote]

Good luck.

11

Thanks, I’ve got a pretty good support system. My wife is a Pharm.D resident, and my sister is a Ph.D in Pharmaceutical Sciences.

/hijack

13

It’s always ATP-CP first, as I understood it. That’s why the system exists. Then the body starts creating ATP via Gycolysis/TCA cycle/ETC, with availability of oxygen as a limiting factor. The different types of fibers are able to utilize oxygen more or less efficiently than others.

I’d have to look it up to be sure, but I know I’m right about ATP-CP system. I remember that pretty vividly because the instructor emphasized the point. You’re right about the order the fibers are used, I’m pretty sure, but the whole point of storing CP is so you have a way easily rebuild ATP when you need it immediately, which you will if you start exercising.

15

I read it again tonight, the muscle stores enough ATP for one contraction, then enough CP to get through to ATP production.

Slow twitch fibers are adapted for more mitochondrial ATP production and have a better capillary network and blood supply, appearing red or pink. More blood=more oxygen, of course.

17

Don’t forget that the muscles don’t need ATP to contract, they need it to relax…

18

[quote]Professor X wrote:
un33q wrote:
futurepharm wrote:
Crisis? Really? This is a CRISIS?

I thought it was ATP-CP first, then aerobic until you run out of oxygen, then only glycolysis to lactic acid. Isn’t that why your muscle maintains a store of ATP and CP? Then begins producing ATP aerobically until oxygen levels decrease?

It’s been last semester since I had that stuff, but I think that’s the way it goes.

I agree that slow twitch should dominate unless the athlete performs reps faster at first then slows later, if this is even necessary. It’s light weight, right? Should be mostly slow twitch.

Haha yer its not really a crisis but at least it got your attention.
I get you on the ATP-CP system first. But i don’t understand what you mean by running out of oxygen. How does the body cope with no oxygen.
This stuff is driving me nuts. !@#$!$%!
thx for your help though.

Buy a college level biology book then. If you don’t understand how your body can work anaerobically, it means you need to learn the basics of how your body works…instead of simply asking individual questions at every turn while missing the big picture. That would be how you stop driving yourself “nuts”.

Look up “lactic acid” and “anaerobic resistance training”[/quote]

Ok i know i’ve got a lot to learn and i shouldn’t have come onto this forum asking for help. I should be researching this stuff by myself. I’ve just been lazy and i need to get my act together. Thx.

19

[quote]futurepharm wrote:
To be fair, Prof, this wasn’t covered until the first semester of A&P, at least in the books we used, and they really glossed over all of the slow, intermediate, and fast-twitch stuff. I read it because I was interested, and may need it later.

For the cliffs notes version, your muscles keep a small supply of ATP on hand, and keeps extra phosphate for ATP production as creatine phosphate, CP. When that runs out, you have to create more ATP, because the muscles won’t relax without it.

The ideal pathway for ATP production is glycolysis followed by the TCA cycle and Electron Transport Chain in the mitochondria. This requires oxygen, and is called aerobic respiration. By the way, glycolysis does not require oxygen, and is called anaerobic respiration. In the absence of oxygen, the only way to make energy is glycolysis, which produces lactic acid as a byproduct.

So it’s ATP-CP first, aerobic respiration second, anaerobic third, but remember that anaerobic is the first step of aerobic until you run low on oxygen.

And you don’t run out of oxygen, per se, but rather you can’t get enough oxygen to the muscles fast enough to get to aerobic respiration.

[/quote]

Wow. I really appreciate your input. I hope this has at least refreshed your knowledge of this topic and that you’ve gained something from this. Thx again you’ve reallly helped me out here.