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Originally Posted by TRITON
I also push quite hard when I do DNF,because as far as I know hands consume more air that legs,so it's better to push off hard once that to do one or two strokes with your hands.In DYN i push gently.THere's also one thing that I noticed.
I's far more "dangerous" to "speed up" during DNF than in DYN.It's more likely that you'll experience a samba or a blackout if you accelerate quickly(at the end of your dive) in DNF than in DYN.
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Maybe someone on the forum knows for sure about the amount of energy used by legs versus arms. My reasoning and experience tells me that the legs require more energy (oxygen) than arms. Basic laws of physics conclude that power output is proportional to input energy. So, legs being more powerful use more energy than arms. Bigger muscles naturally use more energy. Also, there is the dive reflex which talks about the body constricting blood from the extremities to the heart, lungs, and brain. Legs are further from the priority organs than the arms. So, it would seem the using the legs retards the natural course of the dive reflex.
I have also observed that a good push in DNF is worth one to two armstrokes. Legs are just more powerful and make streamlining easier. I also find that turns in DNF offer an opportunity to rest and relax the arms. A 50 meter pool is harder for my DNF than a 25 meter pool. In 100 meters, it's one turn (50m pool) versus 3 turns (25m pool.)
About speeding up in DNF at the end leading to LMC or BO: Triton is right. I have noticed, in beginners especially, that there's a natural tendancy to speed up near the wall. For me, speeding up means taking more strokes and thus consuming more energy (oxygen.) The challenge is to find and maintain a constant rhythm from start to finish. Near the end of a maximum, keeping the same stroke rhythm is one way to keep the focus on how one is doing rather than trying to reach some distance goal. Trying to reach a preconceived distance gets me in trouble. While I do not swim dynamics with fins, I still would think that speeding up at the end also is a sign of tension, anxiety, unconscious desperation, and pending hypoxia. The difference with DYN is that it's faster to begin with. I still would think that speeding up in DYN still leads to LMC or BO. It's a good topic.
Peace,
Glen
