title: Running mileage, movement mileage, and fitness in male U.S. Navy recruits.
abstract: OBJECTIVE
  The purpose of this study was to determine whether there is a relationship between overall fitness improvement and varying amounts of running and movement mileage.
  
  
  METHODS
  Subjects were male U.S. Navy recruits (N = 1703, 25 divisions), ages 17-35 yr (mean age = 20.1 +/- 2.9 yr), who attended boot camp from April 1996 through August 1996. During the first week of training, recruits performed a 1.5-mile run to determine baseline fitness levels. The results from the initial run were compared with a final 1.5-mile run conducted 6 wk later.
  
  
  RESULTS
  Based on an age-adjusted fitness scale for a 1.5-mile run time, about one third of the recruits began recruit training in "Excellent-Superior" condition (N = 558), one third began in "Good" condition (N = 582), and one third began in "Poor-Fair" condition (N = 563). Running mileage among divisions ranged from 11.5 to 43.5 miles for the entire 7-wk training period (mean = 22.7 +/- 7.2 miles; 8-22 run days, mean = 13 +/- 4 d). In addition to running, the divisions accumulated many movement miles (110-202 miles; mean = 145 +/- 26 miles) while marching in formation. Recruits who began training in Poor-Fair condition improved the most with an average decrease in run time of 1:55 +/- 1:06 min (15.6% improvement). The Good group improved by 47 +/- 37 s (7.3% improvement), and the Excellent-Superior group improved by 17 +/- 32 s (2.9% improvement).
  
  
  CONCLUSIONS
  The magnitude of fitness improvement, as measured by run time improvement, was directly related to baseline fitness level but not related to movement mileage or high-intensity run mileage accrued during training.
authors.affiliation: Naval Health Research Center, Division of Clinical Epidemiology, Department of Health Sciences and Epidemiology, San Diego, CA, USA. trank@nhrc.navy.mil
authors.forename: T V
authors.initials: TV
authors.lastname: Trank
authors.forename: D H
authors.initials: DH
authors.lastname: Ryman
authors.forename: R Y
authors.initials: RY
authors.lastname: Minagawa
authors.forename: D W
authors.initials: DW
authors.lastname: Trone
authors.forename: R A
authors.initials: RA
authors.lastname: Shaffer
mesh_terms: D000293:Adolescent; D000328:Adult; D006801:Humans; D008124:Locomotion; D008297:Male; D008889:Military Personnel; D010809:Physical Fitness; D012420:Running / Q000502:physiology*; D013647:Task Performance and Analysis