title: Effect of crank length on joint-specific power during maximal cycling.
abstract: Previous investigators have suggested that crank length has little effect on overall short-term maximal cycling power once the effects of pedal speed and pedaling rate are accounted for. Although overall maximal power may be unaffected by crank length, it is possible that similar overall power might be produced with different combinations of joint-specific powers. Knowing the effects of crank length on joint-specific power production during maximal cycling may have practical implications with respect to avoiding or delaying fatigue during high-intensity exercise.
  
  
  OBJECTIVE
  The purpose of this study was to determine the effect of changes in crank length on joint-specific powers during short-term maximal cycling.
  
  
  METHODS
  Fifteen trained cyclists performed maximal isokinetic cycling trials using crank lengths of 150, 165, 170, 175, and 190 mm. At each crank length, participants performed maximal trials at pedaling rates optimized for maximum power and at a constant pedaling rate of 120 rpm. Using pedal forces and limb kinematics, joint-specific powers were calculated via inverse dynamics and normalized to overall pedal power.
  
  
  RESULTS
  ANOVAs revealed that crank length had no significant effect on relative joint-specific powers at the hip, knee, or ankle joints (P > 0.05) when pedaling rate was optimized. When pedaling rate was constant, crank length had a small but significant effect on hip and knee joint power (150 vs 190 mm only) (P < 0.05).
  
  
  CONCLUSIONS
  These data demonstrate that crank length does not affect relative joint-specific power once the effects of pedaling rate and pedal speed are accounted for. Our results thereby substantiate previous findings that crank length per se is not an important determinant of maximum cycling power production.
authors.affiliation: Centre for Sports Medicine and Human Performance, Brunel University, Uxbridge, United Kingdom.
authors.forename: Paul R
authors.initials: PR
authors.lastname: Barratt
authors.forename: Thomas
authors.initials: T
authors.lastname: Korff
authors.forename: Steve J
authors.initials: SJ
authors.lastname: Elmer
authors.forename: James C
authors.initials: JC
authors.lastname: Martin
mesh_terms: D000328:Adult; D000843:Ankle Joint / Q000502:physiology*; D056352:Athletes; D054874:Athletic Performance / Q000502:physiology; D001642:Bicycling / Q000502:physiology*; D005260:Female; D006621:Hip Joint / Q000502:physiology*; D006801:Humans; D007719:Knee Joint / Q000502:physiology*; D008297:Male; D018763:Muscle Fatigue / Q000502:physiology; D053580:Muscle Strength / Q000502:physiology*; D055815:Young Adult