An angular velocity profile in cycling derived from mechanical energy analysis

Area of Science:

• Biomechanics
• Human Movement Science
• Sports Engineering

Background:

• Seated cycling involves complex leg segment movements.
• Constant angular velocity pedaling results in variations in total mechanical energy, indicating internal work.

Purpose of the Study:

• To develop a procedure for determining an angular velocity profile that maintains constant total mechanical energy in seated cycling.
• To test the hypothesis that this optimized profile reduces internal work and potentially energy expenditure.

Main Methods:

• A five-bar linkage model was used to derive equations for leg segment kinetic and potential energies.
• Experimental pedal angle data were collected from subjects to compute mechanical energy.
• A procedure was developed to find an angular velocity profile minimizing total energy change.

Main Results:

• Constant angular velocity pedaling showed significant variations in total mechanical energy.
• The developed angular velocity profile reduced internal work by a minimum of 48% compared to constant velocity pedaling.
• The optimized profile's peak angular velocities occurred near the vertical crank positions.

Conclusions:

• The developed procedure effectively determines an angular velocity profile that minimizes internal work in cycling.
• Reducing internal work through optimized pedaling has implications for energy expenditure in cycling.
• This finding supports future research on the relationship between internal work and overall energy cost in athletic activities.