title: Is it possible to individualize intensity of eccentric cycling exercise from perceived exertion on concentric test?
abstract: OBJECTIVE
  To assess the safety and acute effects of a procedure using perceived exertion during a prior submaximal concentric (CON) test to individualize eccentric (ECC) cycling exercise intensity.
  
  
  METHODS
  Prospective, monocentric open study.
  
  
  METHODS
  Technological investigation platform at a physical medicine and rehabilitation department in a university hospital.
  
  
  METHODS
  Healthy subjects (N=18; 15 men, 3 women) aged between 22 and 37 years.
  
  
  METHODS
  The subjects performed 3 cycling exercises: (1) incremental CON test to determine the comfortable pedaling power (CPP) corresponding to a Borg scale rating of 12 (rate of perceived exertion); (2) steady-state CON exercise at the CPP workload to determine the corresponding plantar pressure; and (3) steady-state ECC exercise with an imposed resistance corresponding to the CPP plantar pressure.
  
  
  METHODS
  Rate of perceived exertion on Borg scale, oxygen uptake (V˙o2), heart rate, cardiac output, and stroke volume using inert gas rebreathing techniques were measured during steady-state CON and ECC exercises. Muscle soreness was rated on a visual analog scale immediately, 24, and 48 hours after the tests.
  
  
  RESULTS
  No adverse effects were reported. V˙o2 was about 5 times the resting value during CON exercise, while it was twice that during ECC exercise. Cardiac output was lower during ECC exercise (P<.05). This moderate increase of cardiac output was exclusively linked to a greater increase in stroke volume during ECC exercise than during CON exercise (P<.05).
  
  
  CONCLUSIONS
  Moderate-intensity ECC cycling exercise tailored according to perceived exertion during a prior CON test is well tolerated. It corresponds to a limited muscular use of oxygen and to an isolated increase in stroke volume. It appears to be a feasible procedure for preconditioning before ECC training.
authors.affiliation: CIC-P Inserm 803, Plateforme d'Investigation Technologique, University Hospital of Dijon, Dijon, France. davy.laroche@chu-dijon.fr
authors.forename: Davy
authors.initials: D
authors.lastname: Laroche
authors.forename: Charles
authors.initials: C
authors.lastname: Joussain
authors.forename: Claire
authors.initials: C
authors.lastname: Espagnac
authors.forename: Claire
authors.initials: C
authors.lastname: Morisset
authors.forename: Nicolas
authors.initials: N
authors.lastname: Tordi
authors.forename: Vincent
authors.initials: V
authors.lastname: Gremeaux
authors.forename: Jean-Marie
authors.initials: JM
authors.lastname: Casillas
mesh_terms: D000328:Adult; D001642:Bicycling / Q000502:physiology*; D002302:Cardiac Output / Q000502:physiology; D005080:Exercise Test; D005081:Exercise Therapy; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology; D005082:Physical Exertion / Q000502:physiology*; D011446:Prospective Studies; D015203:Reproducibility of Results; D055815:Young Adult