Cycling Flashcards
What is power?
Is the rate at which energy is put into a system
Factors affecting power output in cycling?
Force and velocity
Force applied by the foot to the pedal
Velocity component needs to describe the speed of the pedal when force is applied
What happens as a result in pedal speed increasing?
Increase in joint angular velocity
increase in Muscular contractile velocity
Decrease in muscular force
Two main factors affecting pedal speed?
- Cadence
(RPM) - Crank length
(Larger circumference of the circle results in greater pedal speed)
Forces affecting pedal?
Perpendicular component of the force vector creating torque (Fe)
What is torque?
Anglular version of force
Relationship between leg forces when cycling?
When one leg produces negative force during the recovery phase, the other leg is in the power phase producing positive forces
Korff et al. 2007
β πΌπΉπΈ = 100 β ( 360 πΉπ(π)
βββββ
360 πΉπ‘(π) )
Muscle activation patterns in cycling?
Knee extensors activated first followed by Hip extensors
Peak power typically occurs when?
At 30% of peak force
Muscle length is directly related to joint angle as?
Extensor muscles lengthen through joint flexion
Flexors through joint extension
Muscle length is affected by what bike setup mechanics?
Saddle height
Crank length
handlebar position
How does the length of a muscle affect force?
Ability for muscle to generate force is affected by its length
What did (Ferrer-Roca et al. 2014) find in related to saddle height and joints?
Ankle joint first to show adapted kinematics with changes in saddle height
What did (Peveler and Green, 2011) find range for knee angle?
Debate ongoing on how to best set its height
β 25-35Β° of knee flexion at bottom dead centre
β Height equal to 109% of inseam length
