Rowing Crew Coordination Dynamics at Increasing Stroke Rates

Area of Science:

• Sports Science
• Biomechanics
• Human Movement

Background:

• Optimal crew performance in rowing relies on precise synchronization.
• Previous research suggests antiphase coordination may be mechanically more efficient by reducing velocity fluctuations.
• Coupled oscillator dynamics predict reduced stability of antiphase coordination at higher stroke rates.

Purpose of the Study:

• To investigate the impact of increasing stroke rates on in-phase and antiphase rowing coordination in dyads.
• To compare the stability and efficiency of in-phase versus antiphase rowing patterns under varying stroke rates.

Main Methods:

• Eleven experienced rowing dyads used mechanically coupled ergometers allowing fore-aft movement.
• Dyads performed ramp trials, gradually increasing stroke rates from 30 to maximal in both in-phase and antiphase patterns.
• Kinematic data of rowers, handles, and ergometers were collected.

Main Results:

• Two dyads broke down from antiphase to in-phase coordination early in the ramp trial.
• Nine dyads maintained antiphase coordination up to 34-42 strokes per minute, achieving lower maximum rates than in-phase.
• Antiphase coordination showed worse accuracy but similar variability compared to in-phase.
• Velocity fluctuations of ergometers were larger in in-phase, with the difference increasing with stroke rate.

Conclusions:

• Antiphase rowing is less stable than in-phase rowing, with a higher tendency for coordination breakdown at increased stroke rates.
• Despite lower stability, the potential efficiency benefits of antiphase rowing over in-phase rowing may increase with stroke rate.
• Stroke rate significantly impacts ergometer velocity fluctuations, with antiphase patterns exhibiting less fluctuation, especially at higher rates.