Biomechanist Gustavo Lima Breaks Down Popovici’s 46.51 vs. Pan Zhanle’s 46.40 (Deep Data Dive) ...Middle East

By Braden Keith on SwimSwam

2025 World Championships

Swimming biomechanist Gustavo Lima from Brazil has pulled together some interesting data comparing David Popovici‘s 46.51 in the 100 free from the 2025 World Championships to Pan Zhanle‘s 46.40 World Record in the same event from the 2024 Olympic Games.

Looking beyond basic splitting, Lima broke the swims down on metrics like distance per stroke and stroke rate.

There are a few interesting things revealed by the analysis.

For one, Pan’s stroke rate starts very high, but then steadily decreases as the race goes on. Popovici’s also starts high and decreases for the first 50 or so, both at a lower rate than Pan, but at the turn the two flip. Popovici has a much higher stroke rate in the back half of the race than does Pan.

Pan, however, has a longer distance-per-stroke in the back half of the race, which helps balance out the lower stroke rate. Ultimately, Pan’s front-half nets out better than Popovici’s, and that’s the difference maker in the race.

What’s most interesting is that on average, they both have the same average stroke rate (50.7) and very similar average distance per stroke.

Both swimmers took exactly 64 strokes in the record-setting swims.

In short: the two swimmers, part of a new generation of guys who specialize in the 100 and 200 free (versus the 50 and 100) and have leaner builds than classic sprinters, swim their races very similarly. This perhaps points to a new formula for this extreme level of success in the 100 free.

Check out the data from Lima’s Instagram account below:

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