Breaststroke Breakdown: TritonWear Reveals Trends Across Age Groups

Coaches Corner

Greetings swimmers, coaches, and swimming enthusiasts! Today we are back with another installment of the TritonWear Analysis series.

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Our data analysis team has been working away to provide us with an in-depth analysis of each swimming stroke. First, there was the freestyle analysis, followed by the backstroke analysis, and now we will be turning our attention to breaststroke.

In the freestyle analysis, we learned that age and height affect a swimmer’s overall stroke and speed. More specifically, we revealed that young swimmers (roughly 10-20 for females and 10-22 for males) tend to decrease their stroke rate and increase their distance per stroke (DPS) in order to improve their freestyle swimming speed.

As a refresher, here is what we mean by distance per stroke (DPS) and stroke rate:

DPS and Stroke Rate definitions

Breaststroke Analysis:

Today, our data science team is pondering: as young swimmers continue to grow in age, height, and ability, how do these changes affect their breaststroke development?

To tackle this question, we reviewed data from 826 male and 885 female swimmers (ages 10–25) who swam breaststroke in 25m pools using Triton Units to collect swimmers’ stroke information.

We discovered that young swimmers generally improve their DPS as they become older, which makes sense given that many of these swimmers are continuing to grow. Significantly, our data team also found that young swimmers tend to drop their stroke rate and improve their DPS in order to become speedier breaststrokers (which is the same trend we observed earlier in the freestyle analysis).

However, with breaststroke, this trend (decrease in stroke rate + increase in DPS = faster swimming) was less dramatic than we saw with freestyle. If you take a look at the graphs below, you will see that the relationship between DPS and age is quite linear for breaststroke; in both the male and female graphs, the line showing DPS gradually increases (travels upward) with age, and the line showing stroke rate gradually decreases (moves downward) with age.

Breaststroke DPS and SR graphs for men and women

Overall, here is what the TritonWear team found:

DPS and SR findings summary

Next, our data team wanted to take a closer look at the differences between male and female swimmers in terms of their breaststroke DPS progression. And we learned that male swimmers tend to increase their breaststroke DPS by a greater margin than female swimmers on an annual basis; whereas female swimmers generally increase their breaststroke DPS by 4.2cm every year, male swimmers increase their DPS by 6.6cm every year (which is why the blue line rises at a steeper angle than the green one in the graph below).

DPS change by age for Men and Women

Interestingly, we also discovered that—unlike with freestyle—swimmers ages 20+ years showed virtually no drop off in breaststroke DPS improvement (as you can see in the graph above, for both male and female swimmers, those lines just keep on heading onward and upward!).

Comparing Breaststroke and Freestyle: 

Our data team decided to “complete one final breaststroke-to-freestyle turn” and revisit the freestyle data in order to draw comparisons between the two strokes.

In order to compare the two strokes effectively, we focused on “distance per cycle” (DPC) as opposed to distance per stroke (DPS). For butterfly and breaststroke, a “cycle” is only 1 stroke because both arms pull simultaneously. However, for freestyle and backstroke, a “cycle” is 2 strokes because each arm pulls separately.

So, to convert the previous freestyle findings from DPS to DPC, we multiplied the freestyle DPS data by 2 (for breaststroke, DPS and DPC are already the same, so no extra work required here!).

DPC change by age for Men and Women

Significantly, we found that swimmers increase their DPC more gradually when it comes to breaststroke versus freestyle (as you can see from the graph above, the gap between strokes is most dramatic around age 18). However, because swimmers continue to steadily improve their breaststroke DPC over time, breaststroke DPC ultimately rises to meet freestyle DPC when swimmers are approximately 24+ years old. 

Final Thoughts:

In breaststroke, as in freestyle, the main factor that helps young swimmers improve their swimming speed is increasing their DPS/DPC. However, unlike with freestyle, breaststroke DPS/DPC does not peak when swimmers are in the early 20s and then start to decrease—it continues to increase even once swimmers reach 24+ years old.

Lastly, swimmers and coaches should be aware that DPC comparisons between freestyle and breaststroke can be tricky because these strokes tend to progress at varying rates and follow divergent patterns; the difference is particularly noticeable in swimmers’ late teenage years (around age 18) when freestyle DPC is typically 20% longer than breaststroke DPC.

Thanks for stopping by, and be sure to check out our freestyle and backstroke analyses, as well as our Olympic Games race analyses (such as Katie Ledecky vs. Rebecca Adlingtonthe London 2012 Men’s 100 Free Final, and more!).

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