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I started swimming and trying to swim 1500m nonstop (as a first goal). I gradually increased my set distances. After 4 weeks I can swim 1000m nonstop. I guess I will reach 1500m in 2 weeks. One thing I observe is; my stroke count per 50m decreased from 59 to 48 in 3 weeks period. But it stopped there. (I can now swim 1:52 100m) My question is: Is 48 strokes per 50m a good rate or should I try to lower the stroke count by lengthening the stroke length?

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2 Answers 2

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The world record holder on 1500m is Sun Yang, an analysis of his stroke per length and stroke rate can be found at Sun Yang. His stroke rate (or frequency) is 0.96 (almost a stroke per second) and his strokes per 50m length is 27.

Your stroke rate is 0.85 (48 strokes per 56 seconds) or 51 strokes per minute, i.e. slower than Sun Yang (58 strokes per minute), and you need 48 strokes (1.04 m/stroke) where he needs 27 (1.85 m/stroke).

In figure 1, I have plotted the two points and one of my own measurements: {{1.85, 0.96}, {1.04, 0.85}, {1.78, 0.68}} and also - assuming constant speed - the Stroke frequency as a function of Stroke length, that is Speed = Stroke frequency * Stroke length

Here, you can see that if Sun Yang had a shorter Stroke length (e.g. not have as long arm as he has), he has to increase the Stroke frequency to swim with a the same speed. For me to approach Sun's speed (not likely to happen :-)), my focus should be to increase the frequency.

Fig1

Fig 1. Constant speed as a function of Stroke frequency and Stroke length

Whether you want to change speed or keep the speed constant and work with a frequency, length combination, depends on your overall goals for swimming. Two references that can help you are:

Assuming that you want to go faster, I would experiment with the stroke rate, e.g. through getting a tempo trainer, e.g. Finis tempo trainer. However, my own experience as almost beginner, is that if I increase the effort beyond my technique, I get really tired very fast.

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Just wanted to add that you can "artificially" lower your stroke rate by extending the glide phase, but that's not really accomplishing what you want. As you get more efficient with your stroke, your rate will naturally lower. If you would really like to improve, then you may need to take some lessons. Swimming is extremely technique driven, so once you get as fast as your fitness will allow, any further improvements will have to come from stroke refinement. –  JohnP Sep 4 '12 at 14:43

Glide phase is important. So on each stroke, you want to hold it for a minimal amount of time to enjoy the benefit of the glide.

I was taught to bring your arm forward, stretch out, for maximum length, hold that hand forward for a pause, then bring the other arm back, holding that one forward.

Same on breast stroke, you need to hold the glide for a moment. (I cannot define the length of that moment).

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