Relationship between Cyclic and Non-Cyclic Force-Velocity Characteristics in BMX Cyclists

Area of Science:

• Sports Science
• Biomechanics
• Exercise Physiology

Background:

• Transfer of muscular force-velocity (Fv) characteristics from strength training to cycling is crucial for BMX cyclists.
• Understanding the relationship between Fv and torque-cadence (Tc) characteristics is key for optimizing performance.

Purpose of the Study:

• To investigate the correspondence between Fv characteristics in squat jumps and Tc characteristics in cycling tasks among elite BMX racers.
• To determine the extent to which Fv and Tc profiles align between a common strength exercise and sport-specific cycling.

Main Methods:

• Twelve high-level BMX racers participated in the study.
• Participants performed multiple loaded squat jumps to assess Fv characteristics.
• Two cycling tests were conducted: ramp starts and flat-ground sprints to evaluate Tc characteristics.

Main Results:

• Strong correlations were found between peak power in jumps and peak power during ramp starts (r = 0.85).
• Significant correlations were observed between maximal force in jumps and maximal torque during ramp starts (r = 0.77).
• However, relationships for velocity-dependent variables (e.g., v0, SFv) and cadence showed weak correlations, indicating discrepancies.

Conclusions:

• While some Fv characteristics correlate well, discrepancies exist, particularly for high-speed variables and profile slopes.
• Performing both jump-based and cycling-specific Fv testing is recommended for a comprehensive assessment.
• Torque-cadence testing on a start ramp is slightly more representative than on flat ground and should be prioritized when possible.