title: Impact of low-intensity isocapnic hyperpnoea on blood lactate disappearance after exhaustive arm exercise.
abstract: OBJECTIVE
  To investigate the impact of low-intensity isocapnic hyperpnoea (IH) on blood lactate disappearance after exhaustive arm exercise in comparison with passive and active recovery using the previously loaded muscle group.
  
  
  METHODS
  Randomised, crossover trial.
  
  
  METHODS
  Institute for Sports Medicine.
  
  
  METHODS
  18 healthy non-smoking and physically active male subjects.
  
  
  METHODS
  Subjects performed three arm cranking tests to volitional exhaustion on 3 different days at least 48 h apart. Arm exercise was randomly followed by 30 min of passive recovery (PR), active arm cranking (AC) at 30% of peak power output or ventilatory recovery (VR) by means of IH at 30% of 12 s maximal voluntary ventilation. Blood lactate concentrations were measured every 2 min during recovery.
  
  
  METHODS
  Blood lactate disappearance during the three different recovery strategies.
  
  
  RESULTS
  No significant differences in blood lactate concentrations were found between interventions PR, AC and VR during the whole measurement period. Mean (SD) peak lactate concentrations were 11.09 (1.98) mmol/l for PR, 11.13 (1.44) mmol/l for AC and 11.25 (1.93) mmol/l for VR. At the end of the recovery period measured lactate concentrations were 4.35 (1.56) mmol/l for PR, 3.77 (1.60) mmol/l for AC and 4.09 (1.35) mmol/l for VR. Moreover, all other variables measured were not significantly different, with the exception of higher average recovery heart rates during AC (116 (9) bpm) and VR (111 (17) bpm) compared with PR (93 (11) bpm).
  
  
  CONCLUSIONS
  Low-intensity IH seems not to enhance blood lactate disappearance after exhaustive arm exercise compared with passive or active recovery using the previously loaded muscle group. The magnitude of the involved muscle mass appears critical to effective active recovery.
authors.affiliation: Swiss Paraplegic Research, Nottwil, Switzerland. claudio.perret@paranet.ch
authors.forename: Claudio
authors.initials: C
authors.lastname: Perret
authors.forename: Gabi
authors.initials: G
authors.lastname: Mueller
mesh_terms: D000328:Adult; D001132:Arm; D002245:Carbon Dioxide / Q000097:blood / Q000378:metabolism*; D018592:Cross-Over Studies; D015444:Exercise / Q000502:physiology*; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D019344:Lactic Acid / Q000097:blood*; D008297:Male; D010100:Oxygen / Q000097:blood; D010101:Oxygen Consumption / Q000502:physiology; D005082:Physical Exertion / Q000502:physiology*; D012039:Regional Blood Flow / Q000502:physiology; D012129:Respiratory Function Tests; D012132:Respiratory Muscles / Q000502:physiology
chemical_list: D002245:Carbon Dioxide; D019344:Lactic Acid; D010100:Oxygen