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Fitness Theory and Practice. CrossFit's rationale & foundations. Who is fit? What is fitness?

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Old 09-12-2014, 09:03 AM   #1
Nik Nichols
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aerobic exercise, efficiency.

Question: what happens when you are able to get better at an aerobic exercise, in the cellular level?

I understand that oxygen is the fuel for muscle activity. SO what happens when it gets better? What adaptation happens to make improvement at the cellular level?
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Old 09-17-2014, 07:26 AM   #2
Larry Bruce
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Re: aerobic exercise, efficiency.

There are more mitochondria formed in the slow twitch and intermediate muscle fibers (cells). This allows more aerobic energy to be created. Also the prerequisite enzyme levels increase.

Somewhat related the diameter of these fibers can decrease which makes it relatively more aerobically powerful. Resistance training can offset this though, which is good or bad depending on your priorities.
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Old 09-17-2014, 09:21 AM   #3
Nik Nichols
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Re: aerobic exercise, efficiency.

Larry Bruce, thank you. I have done some research myself and found the same thing. The blood flow is better, capillary dilation is better and more mitochondria in the cells.

WFS http://www.gssiweb.org/Article/sse-5...robic-training

I Crossfit, but have been studying the aerobic and anaerobic adaptations.
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Old 09-17-2014, 09:35 AM   #4
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Re: aerobic exercise, efficiency.

Oh and thanks Larry, after 600 views on this thread, I was really let down on the fact that no one had a reply.
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