title: Comparison of the 45-second/15-second intermittent running field test and the continuous treadmill test.
abstract: OBJECTIVE
  To compare the physiological responses and maximal aerobic running velocity (MAV) during an incremental intermittent (45-s run/15-s rest) field test (45-15FIT) vs an incremental continuous treadmill test (TR) and to demonstrate that the MAV obtained during 45-15FIT (MAV45-15) was relevant to elicit a high percentage of maximal oxygen uptake (VO2max) during a 30-s/30-s intermittent training session.
  
  
  METHODS
  Oxygen uptake (VO2), heart rate (HR), and lactate concentration ([La]) were measured in 20 subjects during 2 maximal incremental tests and four 15-min intermittent tests. The time spent above 90% and 95% VO2max (t90% and t95% VO2max, respectively) was determined.
  
  
  RESULTS
  Maximal physiological parameters were similar during the 45-15FIT and TR tests (VO2max 58.6±5.9 mL·kg(-1)·min(-1) for TR vs 58.5±7.0 mL·kg(-1)·min(-1) for 45-15FIT; HRmax 200±8 beats/min for TR vs 201±7 beats/min for 45-15FIT). MAV45-15 was significantly (P<.001) greater than MAVTR (17.7±1.1 vs 15.6±1.4 km/h). t90% and t95% VO2max during the 30-s/30-s performed at MAVTR were significantly (P<.01) lower than during the 30-s/30-s performed at MAV45-15. Similar VO2 during intermittent tests performed at MAV45-15 and at MAVTR can be obtained by reducing the recovery time or using active recovery.
  
  
  CONCLUSIONS
  The results suggested that the 45-15FIT is an accurate field test to determine VO2max and that MAV45-15 can be used during high-intensity intermittent training such as 30-s runs interspersed with 30-s rests (30-s/30-s) to elicit a high percentage of VO2max.
authors.affiliation: Faculty of Sport Sciences, University of Burgundy, Dijon, France.
authors.forename: Hervé
authors.initials: H
authors.lastname: Assadi
authors.forename: Romuald
authors.initials: R
authors.lastname: Lepers
mesh_terms: D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D015415:Biomarkers / Q000097:blood; D005080:Exercise Test / Q000379:methods*; D006339:Heart Rate; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D016014:Linear Models; D008297:Male; D009119:Muscle Contraction; D018482:Muscle, Skeletal / Q000378:metabolism / Q000502:physiology*; D010101:Oxygen Consumption; D010507:Periodicity; D010809:Physical Fitness; D012420:Running; D013647:Task Performance and Analysis; D013997:Time Factors; D055815:Young Adult
chemical_list: D015415:Biomarkers; D019344:Lactic Acid