Data (was PowerCranks Study)

Here is a condensed preview of the numbers from the PC testing. The
study was conducted by Mark D. Luttrell, Dept of Health, Sport and
Exercise Science, University of Kansas and Jeffrey A. Pottteiger, Dept
of Physical Education, Health and Sports Studies, Miami University.

The effects of 6 weeks of training with PCs was examined for 6 cyclists
(+6 with regular cranks) to determine changes in V02 max, AT, HR, V0,
and RER during a 1 hour submaximal ride (~69% V02 max).

Here are the numbers for Heartrate (HR) and Gross Efficiency (GE) before
and after training.

Time (minutes)

PC Group 15 30 45 60

HR Pre 154 155 156 157

Post 141 140 141 141



GE (%)Pre 21.5 21.3 21.6 21.5

Post 23.1 23.0 23.6 23.9



Control Group

HR Pre 166 165 166 163

Post 159 159 159 160



GE (%) Pre 21.3 20.8 20.8 21.2

Post 21.8 21.5 21.3 21.0

Significant is the 2% increase in Gross Efficiency of the PC group.

Phil Holman