[Research Review] Optimizing Distance Per Stroke (DPS) and Stroke Rate for Long-Distance Freestyle Efficiency: Latest Academic Literature Review and Training Practice (Article 15)

Source Journal Reference: Journal of Sports Sciences • International Research Findings Review Series

This article explores the trade-off relationship between Distance Per Stroke (DPS) and Stroke Rate in freestyle swimming, and their impact on long-distance freestyle efficiency.

The Efficiency Trade-off Between DPS and Stroke Rate

Swimming speed = DPS × Stroke Rate, and the two are in a trade-off relationship: extending stroke length typically requires a more complete catch and reach, but if the stroke rate drops too low, average speed can suffer due to excessive speed decay during the glide phase and discontinuous overall propulsion. Conversely, chasing a high stroke rate at all costs tends to sacrifice catch quality on each stroke, resulting in “spinning your wheels.” Long-distance freestyle swimmers generally achieve their optimal DPS/stroke rate combination at a moderate stroke rate (approximately 55-65 strokes per minute, varying by individual body size and swimming experience), rather than simply maximizing DPS.

Technical Elements for Optimizing DPS

• Early Vertical Forearm (EVF): Rotate the forearm to a near-vertical angle relative to the direction of travel as early as possible to increase the effective propulsive surface area
• Body Rotation: Appropriate torso rotation extends the stroke path and reduces the burden on the shoulder joint working in isolation
• Bilateral Symmetrical Reach: Fully extend the arm forward after hand entry, avoiding an early downward press into the catch—this is the most direct technical adjustment point for lengthening DPS

Training Data Comparison for DPS and Stroke Rate (Illustrative)

Key Research Conclusions and Practical Recommendations

• Technique over brute force: When DPS is insufficient, prioritize examining the catch path and body rotation angle rather than simply compensating by increasing stroke rate
• Session design: Use alternating “stroke-count swimming” (counting strokes over a fixed distance) and “even-pace swimming” to simultaneously develop DPS efficiency and cardiovascular tolerance at higher stroke rates
• Fatigue monitoring: A noticeable shortening of DPS in the latter stages of long-distance swimming is an early signal of fatigue or technical breakdown, and can serve as a basis for pace adjustment
• Individualized configuration: Taller swimmers with longer arm spans are better suited to a lower stroke rate with a longer DPS strategy; conversely, others may consider a higher stroke rate paired with a shorter but efficient DPS

Common Research Q&A (FAQ)

Q: Is a longer DPS always better?

A: Not necessarily. DPS only matters when paired with stroke rate. Overly pursuing DPS to the point where stroke rate drops too low can actually slow you down due to speed decay during the glide phase and disrupted overall rhythm.

Q: How do I know if my DPS is efficient?

A: Record “strokes per 25 meters” together with the time for each lap. Fewer strokes at the same time, or a faster time with the same stroke count, both indicate improved efficiency.

References and Academic Citations

1. Journal of Sports Sciences — Research on the interaction between freestyle DPS and stroke rate.
2. Sports Biomechanics — Literature on quantitative analysis of EVF catch technique and propulsive efficiency.

Further Reading

• 【科研導讀】划距 (DPS) 與划頻 (Stroke Rate) 最佳化配置對長距離自由式效率影響報告：最新學術文獻回顧與訓練實務 (第 483 篇)
• 【科研導讀】划距 (DPS) 與划頻 (Stroke Rate) 最佳化配置對長距離自由式效率影響報告：最新學術文獻回顧與訓練實務 (第 162 篇)
• 【科研導讀】划距 (DPS) 與划頻 (Stroke Rate) 最佳化配置對長距離自由式效率影響報告：最新學術文獻回顧與訓練實務 (第 870 篇)
• 【科研導讀】划距 (DPS) 與划頻 (Stroke Rate) 最佳化配置對長距離自由式效率影響報告：最新學術文獻回顧與訓練實務 (第 1011 篇)