In young adult military recruits, can marching and running while carrying heavy loads increase the risk of ankle injuries?

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Last updated: September 17, 2026 • View editorial policy

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Yes, Marching and Heavy Load Running Significantly Increase Ankle Injury Risk in Military Recruits

Marching and running while carrying heavy loads substantially increases the risk of ankle injuries in military personnel, with ankle injuries representing 22% of all training-related injuries and overall injury rates reaching 22-67% during basic training depending on service branch and training intensity. 1

Magnitude of the Problem

Military training creates a high-burden injury environment where:

  • 80-90% of all injuries occur to the lower extremities, with the ankle being one of the most commonly affected sites (22% of all injuries) 1, 2
  • Previous ankle sprain is the single strongest predictor of future ankle injury - overuse injuries occurred twice as frequently in trainees with prior ankle sprain history 1
  • The ankle ranks as the second most common injury site after the knee (18%) during military training 2

Load Carriage as a Direct Risk Factor

The evidence demonstrates a clear dose-response relationship between load and injury:

Carrying loads >25% of body weight more than doubles ankle injury risk (OR 2.09,95% CI: 1.08-4.05) 3. The cumulative burden matters critically - higher "pound-miles per month" (product of distance × weight carried) increases injury risk by 92% (RR 1.92,95% CI: 1.17-2.41) 3.

Biomechanical Mechanisms

Heavy load carriage during forced marching causes:

  • Increased peak impact forces and loading rates - both established risk factors for bone stress injuries 4
  • Proximal shift in mechanical work - reduced ankle plantarflexor contribution with disrupted stride-to-stride joint work modulation 5
  • Decreased ankle dorsiflexion and plantarflexion strength post-march, even when cadets don't perceive fatigue 4
  • Suboptimal joint work modulation appearing as stochastic patterns that reduce efficiency and increase injury risk 5

Training Volume Thresholds

High weekly moderate-vigorous physical activity (MVPA) >2,327 minutes significantly increases injury odds 3.4-fold (OR 3.44,95% CI: 1.80-6.56) 2. Road marching ≥5 times per month doubles injury risk (OR 2.11,95% CI: 1.14-3.91) compared to 4 times monthly 3.

Critical finding: Road marching carries 1.8 times higher injury risk per mile of exposure compared to running (RR 1.8,95% CI: 1.38-2.37) 3.

Sex-Specific Considerations

While women show 1.7-2.2 times higher overall injury rates during identical military training 1, after adjusting for physical fitness variables, sex becomes less predictive than body fat percentage and running performance 6. The activities most associated with injuries in women specifically include:

  • Drill and ceremonies
  • Load carriage marching
  • Obstacle courses 6

High-Risk Activity Combinations

The ratio of work to recovery proves critical - MVPA:SLPA (sedentary-light physical activity) ratios >0.51 increase injury odds 3.6-fold (OR 3.60,95% CI: 1.80-7.21) 2. This suggests inadequate recovery between high-intensity activities compounds injury risk.

Soldiers with high occupational lifting demands (50-100+ lbs) face 3.4 times greater road marching injury risk (OR 3.43,95% CI: 1.50-7.85) 3, indicating cumulative loading from both training and occupational tasks creates additive injury risk.

Protective Factors

Running ≥10 miles per week during personal physical training reduces road marching injury risk - those running 0 miles have 3.6 times higher risk (OR 3.56,95% CI: 1.49-8.54), and those running 1-4 miles have 4.1 times higher risk (OR 4.14,95% CI: 1.85-9.25) compared to ≥10 miles/week runners 3.

Clinical Implications

The evidence demonstrates that marching and running with heavy loads creates a perfect storm for ankle injuries through:

  1. Direct mechanical overload from increased impact forces
  2. Altered biomechanics with compensatory movement patterns
  3. Cumulative fatigue reducing protective neuromuscular control
  4. Inadequate recovery when training volume exceeds thresholds

Common pitfall: Assuming perceived exertion correlates with injury risk - cadets showed increased loading and decreased ankle strength despite not feeling fatigued 4, highlighting that subjective fatigue underestimates physiological stress.

The 60% overall injury incidence during 44 weeks of military training 2 underscores that current training practices frequently exceed safe biomechanical thresholds, with ankle injuries representing a substantial portion of this burden.

References

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