Method

Brian SatherAug 08,2008

EQUIPMENT

Bike trainer or rollers
Riser block for front wheel
Spotlights: Two LumaPro 1000 watt (two 500 watt bulbs) quarts halogen bulb work stands
Computer: With video important software (Dartfish) and IEEE1394 card and driver.
IEEE 1394 Cable: 5 meter length
Camera(s): Digital video cameras. Identical cameras needed for simultaneous important from 2 feeds.
Level
Measuring devices: Meter stick and tape measure
Plumb bob
Consent forms
Fan
Multi-tool
Markers: 3M Retroreflective tape and 3 dimensional ball markers (double sided tape needed to adhere these)
Tape: Blue Painter's Tape

PROCEDURE

Cameras set at 1 meter height perpendicular to frontal and sagittal planes (through center of bike bottom bracket)
Measure camera distances from center of bottom bracket = 360 cm
Level cameras - use horizontal or vertical lines on Dartfish and compared to a level or level marks on the wall.
Subject signs consent forms.
Inflate tires to proper pressure: 8 BAR for road tires.
Set bike on trainer/rollers. Ensure that it is level. Mask over potential marker tracking interference points on bike (anything light colored, reflective, or shiny).
Record subject anthropometrics: Inseam, height at minimum.
Record bike setup information: Saddle height, saddle fore/aft, reach, drop, crank arm length.
Subject begins warm-up by pedaling on bike. Researcher goes through orientation and spots rider until rider is comfortable. Instruct subject to get into a "regular" cycling cadence. Ride for about 10 minutes while cameras are set.
Markers added on subject: Sagittal (foot, ankle, knee, hip, base of neck, shoulder, elbow, wrist), Frontal (both hips 3D, top of patella 3D, Top of tibia, tibia above sock), Reverse Frontal (back of Achilles).
Set cameras to manual shutter at 1/1000th
Turn on spotlights.
Before recording: Check bike position in relation to cameras, particularly that bike is aligned perpendicular to the frontal camera.
Start recording on the camera tapes for backup.
Start recording on computer.
Ask subject to perform tasks in intended positions.

Standard Road: Seated on hoods, drops, top bar (10 seconds each). Standing on hoods. Standing drops.
Climbing: Add rider blocks to intended gradient, move roller drum back until vertically under front hub. Seated on top bar, hoods. Standing on hoods.
Opposite view: Switch bike to opposite direction, center bottom bracket over mark. Perform standard road in same sequence.
Time Trial: Time trial position with short standing session.

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