title: Association between ambulatory physical activity and injuries during United States Army Basic Combat Training.
abstract: BACKGROUND
  Associations between physical activity and injuries have been previously examined using self-reports. The present investigation examined this association using objective measures of activity and injury.
  
  
  METHODS
  To quantify ambulatory activity, pedometers were worn daily by recruits in 10 Army Basic Combat Training companies during the 9-week training cycle. Injuries were obtained from a medical surveillance system, defined as traumatic or overuse events resulting in a medical care provider visit. A daily questionnaire documented whether or not recruits wore the pedometers and trained with their companies for the entire day.
  
  
  RESULTS
  Training companies were categorized by activity level into 3 groups with higher activity (HA, 17,948±550 steps/day), 4 with moderate activity (MA, 16,346±768 steps/day) and 3 with lower activity (LA, 14,772±400 steps/day). Among men, the MA and HA groups were at 1.52 (95% confidence interval [95% CI]=1.15-2.01) and 1.94 (95% CI=1.46-2.61) times higher injury risk, respectively, compared with the LA group. Among women, the MA and HA groups were at 1.36 (95% CI=1.07-1.73) and 1.53 (95% CI=1.24-1.89) times higher injury risk, respectively, compared with low LA group. The relationships remained significant after considering physical characteristics and physical fitness.
  
  
  CONCLUSIONS
  In consonance with previous self-report studies, higher physical activity was associated with higher injury risk.
authors: Department of Injury Prevention, US Army Public Health Command (Provisional), Aberdeen Proving Ground, MD, USA.
authors: Joseph J
authors: JJ
authors: Knapik
authors: Keith G
authors: KG
authors: Hauret
authors: Sara
authors: S
authors: Canada
authors: Roberto
authors: R
authors: Marin
authors: Bruce
authors: B
authors: Jones