Fixed versus free-floating stretcher mechanism in rowing ergometers: mechanical aspects

Area of Science:

• Sports Biomechanics
• Exercise Physiology

Background:

• Rowing ergometers utilize stretcher mechanisms to apply force.
• Traditional fixed stretcher mechanisms differ from newer free-floating designs.

Purpose of the Study:

• To compare the mechanical responses of elite rowers using fixed versus free-floating stretcher ergometers.
• To investigate differences in external forces, power, and inertial forces during rowing.

Main Methods:

• 25 elite rowers performed a race-pace rowing protocol on two ergometer types.
• External contact forces (handle, stretcher, seat) and displacements were recorded.
• External power was calculated from force and velocity data.

Main Results:

• Significant differences (P < 0.05) were found for all mechanical parameters between the two stretcher mechanisms.
• The fixed mechanism yielded higher maximum and average forces and external power.
• Higher inertial forces were observed with the fixed mechanism, particularly at the catch.

Conclusions:

• Stretcher mechanism influences muscular coordination and potential physiological adaptations.
• The free-floating mechanism may lower net joint forces and moments, potentially reducing injury risk.