title: Quantification of physical activity performed during US Army Basic Combat Training.
abstract: OBJECTIVE
  During US Army Basic Combat Training (BCT), graduation requirements, including physical readiness training (PRT), are standardized across training sites. However, there are concerns that the standardization may not be closely followed. Therefore, the purpose of this study was to measure and compare physical activity (PA) performed by recruits at 2 Army BCT sites.
  
  
  METHODS
  Twenty-four recruits per company from 11 companies (n=144 at Fort Jackson, SC; n=120 at Fort Sill, OK) wore an accelerometer and completed a daily PA log. The PA of one recruit from each company was recorded using an Army-developed direct observation tool (PAtracker). Amounts of time spent in various activity types, intensities, body positions, and in carrying external loads were obtained from the accelerometer, PA log, and PAtracker. Independent samples t tests were used to compare PA percentage time (%T) across training sites. Repeated measures analysis of variance was used to examine weekly differences in time spent in moderate to vigorous intensity PA during morning PRT.
  
  
  RESULTS
  Physical activity was measured for 47 days at Fort Jackson and 44 days at Fort Sill. Differences in the percentage of time spent in various physical activities between the 2 sites ranged from 0.4% to 15.3% (2.0-93.7 minutes). At Fort Jackson, time spent in moderate to vigorous PA during PRT significantly increased each week for the first 4 to 6 weeks of BCT. No difference was observed in PAtracker data between the 2 training sites in the percentage of time recruits spent in calisthenics (3.9%±3.6% vs 3.8%±3.0%, P=.700), and only a small difference was observed in percentage of time recruits spent running (1.2%±1.7% vs 1.6%±2.0%, P=.037).
  
  
  CONCLUSIONS
  Army recruits at the 2 BCT sites spent similar amounts of time in each PA variable, regardless of the training site and measurement method.
authors.affiliation: US Army Institute for Environmental Medicine, Natick, MA.
authors.forename: Kathleen
authors.initials: K
authors.lastname: Simpson
authors.forename: Jan E
authors.initials: JE
authors.lastname: Redmond
authors.forename: Bruce S
authors.initials: BS
authors.lastname: Cohen
authors.forename: Nathan R
authors.initials: NR
authors.lastname: Hendrickson
authors.forename: Barry A
authors.initials: BA
authors.lastname: Spiering
authors.forename: Ryan
authors.initials: R
authors.lastname: Steelman
authors.forename: Joseph J
authors.initials: JJ
authors.lastname: Knapik
authors.forename: Marilyn A
authors.initials: MA
authors.lastname: Sharp
mesh_terms: D061725:Accelerometry; D006801:Humans; D017770:Lifting; D008889:Military Personnel; D019370:Observation; D064797:Physical Conditioning, Human / Q000502:physiology*; D005082:Physical Exertion; D010809:Physical Fitness / Q000502:physiology; D011187:Posture; D012420:Running / Q000502:physiology; D057566:Self Report; D014481:United States; D016138:Walking / Q000502:physiology