Key Takeaways
- Distance Per Stroke (DPS) measures how far the flywheel (or boat) travels per stroke. Higher DPS at a given split indicates more efficient technique — you are extracting more distance from each drive.[1]
- Stroke Power Index (SPI = watts / stroke rate) measures the power output per stroke. A high SPI means each stroke produces more power, typical of efficient rowers with strong leg drive.[2]
- DPS naturally decreases as stroke rate increases — maintaining DPS at higher rates is a hallmark of technical proficiency.
- Rate-capped drills (rowing at low stroke rates like 18–22 SPM while maintaining split) are a primary method for improving stroke efficiency.
Understanding DPS and SPI
DPS tells you how efficiently you convert each stroke into boat (or flywheel) speed. Two rowers at the same split but different stroke rates have very different DPS values — the one rowing at a lower rate has higher DPS and is likely more technically efficient.[1]
SPI goes a step further by dividing power by rate. A rower producing 200W at 28 SPM has an SPI of 7.14, while one producing 200W at 34 SPM has an SPI of only 5.88. The first rower generates the same speed with fewer, more powerful strokes.
Improving Stroke Efficiency
Low DPS often indicates one or more of: poor catch timing, weak leg drive, early arm break, or rushing the recovery (high slide speed). Rate-capped drills at 18–22 SPM force you to maximize each stroke's contribution.
Track your efficiency over time and compare with the Erg-to-Boat Speed Predictor to see how erg efficiency translates to on-water performance. Plan race splits with the Rowing Race Pace Calculator.
Frequently Asked Questions
Sources & References
- Rowing Biomechanics — BioRow Research Data. Kleshnev V. BioRow.com (2020)
- Concept2 Performance Monitoring Guide. Concept2. Concept2.com (2024)
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