Association between ambulatory physical activity and injuries during United States Army Basic Combat Training

Area of Science:

• Military Medicine
• Sports Medicine
• Exercise Physiology

Background:

• Previous studies on physical activity and injuries relied on self-reports.
• This research utilizes objective measures for a more accurate assessment.

Purpose of the Study:

• To investigate the association between objectively measured physical activity and injury risk in Army Basic Combat Training recruits.
• To compare injury rates across different physical activity levels using objective data.

Main Methods:

• Pedometers were used to objectively quantify daily ambulatory activity in recruits over a 9-week training cycle.
• Injuries were systematically recorded through a medical surveillance system.
• Recruit adherence to pedometer use and training participation was monitored daily.

Main Results:

• Higher activity groups (17,948±550 steps/day) and moderate activity groups (16,346±768 steps/day) showed significantly increased injury risk compared to lower activity groups (14,772±400 steps/day).
• Among men, higher activity was associated with 1.94 times and moderate activity with 1.52 times higher injury risk.
• Among women, higher activity was associated with 1.53 times and moderate activity with 1.36 times higher injury risk.
• These associations remained significant after controlling for physical characteristics and fitness levels.

Conclusions:

• Objective measurement confirms that higher levels of physical activity are associated with a greater risk of injury.
• The findings align with previous research based on self-reported activity levels.
• Understanding this relationship is crucial for injury prevention strategies in physically demanding training environments.