A Qualitative Look at the Physiology of the Zone Intensity System

[@JohnnyBoy-c4b]

I'm a new subscriber and loving your content! This said, I'm having trouble wrapping my mind around how it is that (at the cellular level) in the first few seconds to minutes of exercise the energy utilization process (with increasing intensity) is anaerobic to aerobic, YET, as shown in your slides, during an easy jog, the energy utilization process is the opposite, going from aerobic to anaerobic. I fully understand your presentation and believe it to be 100% accurate. I'm just not clear as to the how and why of the switch. Thank you!

[@ARockOrSomething]

In the first 5-10 seconds of maximal intensity exercise, your body is using creatine phosphate to anaerobically produce ATP (think very short max effort sprint or strength training). Your CP stores are very limited though, so this energy supply drops off a cliff after this short period of time and your body will need to transition to a more aerobic pathway. So essentially this is a different kind of anaerobic energy pathway than glycolysis.

[@bdk2116]

In zone 3, does a well-developed lactate shuttle also handle H+ accumulation as a consequence of lactate utilization or even via a secondary mechanism, or is acidic accumulation similar to a non-aerobically trained athelete, just at a higher pace or power? Have longer zone 3 intervals versus shorter zone 4 or 5 intervals contrasted for their ability to stimulate improvements in lactate shuttling? If zone 2 benefits are exhausted, can AeT be "pulled" up by zone 3 training?

[@hikerJohn]

Why is this resolution at 360P ?

[@Point5TV]

KZbin takes a while to process new videos at different resolutions. It starts at the lowest and works its way up the resolutions. So 360p will be quick and first. Higher resolutions will come later