Professor Jim Martin

Endurance Innovation

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• 2:45 meet University of Utah Associate Professor, Jim Martin
• 5:00 the muscle force-velocity relationship in cycling
• 9:15 the surprising importance of muscle deactivation
  • Slow+heavy weight lifting can slow down deactivation
• 12:30 the ideal crank length question
  • No change in maximal power in crank lengths between 145mm and 195mm crank arms
• 27:30 Jim’s recommendations for crank length for aero-minded TT and triathlon competitors
• 32:15 the aero / power trade-off
• 36:30 is there any reason not to go for the shortest available crank?
• 38:00 how does crank length affect self-selected cadence?
• 40:00 what about aero drag implications of cadence
• 43:00 the myth of optimal cadence
• 48:15 on pedaling mechanics training
  • Self-selected pedaling technique is the most efficient
• 57:30 the effect on efficiency of non-round chainrings

For the papers that Jim referenced, head to the X3 Training Podcast Page.