AERODYNAMICS AND OPTIMAL POWER/CADENCE

Symposium Wielrennen en Wetenschap

Jon Wiggins Topsporttrainer WBV

TESTING PLATFORM – CREATING THE CORRECT OPTIMAL PROFILE

Technique optimal bike positioning 3d analysis Lab and track video analysis linking watts and cadence

Ergometer testing (lab and mobile) Individual training zones (lab and track) Optimal individual track pace zones Track specific accuracy, indentifying temperature changes, tyre choice, watts and cadence

Track- Road aerodynamic performance adjustments

SRM specific telemetry – track skill SRM video analysis

FORCE

Velocity

Figure 6. The relationship between force and velocity in muscular contraction.

Sweat spot – the numerical and physical bullseyeamplitude of training repetition

Regeneration – recuperation

WATT/CADENCE

Neuro-muscul

arCo-

ordination

Strength

Cadence

Efficiency

Output velocity

Power-output

Energy system Force

WHAT ARE WE TRYING TO ACHIEVE?

TRAINING THE BRAIN AND MOTOR

Optimal cadence Optimal gearing W/KG

SYSTEMATIC TRAINING OF THE AEROBIC AND ANAEROBIC CAPACITY

4000 m Team pursuit- Requires high power levels (up to 700 W, and at the start up to 1500 W) with a very high cadence (from 125 rpm up to 140 rpm)

- Intense concentration and good technique are required

- Crucial recovery during drafting

IWI trainerspool 2009

World class 4000m team pursuitDrafting 70-75% of the power of the lead riderLead riders average 650+ watts 128+rpm and 6.0+w/kgCrucial statistics for screening processes.

Stro-motion determining optimal technical lines

TAKING INTO CONSIDERATION AERODYNAMICS Testing on a velodrome to create a individual aerodynamic profileConsiderations need to be placed in the equation for track testing regarding;Rolling resistance (type tyre)Mass of the cyclist and machine (wheels, frames and body shape are set in the formula)Speed Air resistance, atmospheric pressure and temperature

TEST protocol and test results linking watts – speed and cadence

Air flows smoothly around a streamlined aero TT helmet –Crucial not to create this cut off – creating drag due to turbulance at the rear

IWI trainerspool

Power - Speed

0

100

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700

20 25 30 35 40 45 50 55 60 65

Speed

Pow

er

2009

Aerodynamic performance orientation.

Optimalising the aerodynamic performance at crucial velocity/watts the body shape, clothing, Positioning, Bike technology

The main objective is to determine the threshold or race pace velocity with lesser watts – thus increasing the efficiency

IWI trainerspool

Individual Pursuit

- A consistently high power output (~550W) is required

- Cadence is from 100- 140 rpm – depending on numerous factors that govern the individual optimal speed.

- Aerodynamics are of up most importance

- specialists against the clock will minimize fluctuations in power level

2009

THANK YOU

Symposium Wielrennen en Wetenschap

Jon Wiggins Topsporttrainer WBV