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Effect of added mass on treadmill performance and pulmonary function.

Rachel E Walker1, David P Swain, Stacie I Ringleb

  • 1Departments of 1Human Movement Sciences; and 2Mechanical and Aerospace Engineering, Old Dominion University, Norfolk, Virginia.

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Summary

Adding weight significantly impairs military aerobic performance and pulmonary function. Traditional unloaded run tests may not accurately predict performance during loaded field operations.

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Area of Science:

  • Exercise Physiology
  • Military Medicine
  • Sports Science

Background:

  • Military personnel frequently perform strenuous physical activities, including load carriage.
  • Assessing aerobic performance and pulmonary function under load is crucial for operational readiness.

Purpose of the Study:

  • To evaluate the impact of body mass and added mass on aerobic performance and pulmonary function in military personnel.
  • To compare performance on traditional unloaded run tests versus loaded tasks.

Main Methods:

  • Subjects completed a 4.8-km outdoor run and maximal treadmill tests with loads of 0, 10, 20, and 30 kg.
  • Pulmonary function (FEV1, FVC, MVV) was measured with each load.
  • Peak physiological responses (heart rate, oxygen consumption, ventilation) were recorded during treadmill tests.

Main Results:

  • Added mass significantly decreased aerobic performance (time to exhaustion) and pulmonary function (FEV1, FVC, MVV).
  • Body mass was poorly correlated with treadmill performance, except for men carrying a 30-kg load.
  • Correlation between unloaded run performance and unloaded treadmill performance decreased as load increased.

Conclusions:

  • Added mass, not body mass, is a primary factor in reduced aerobic performance.
  • Decreased pulmonary function likely contributes to performance decrements under load.
  • Traditional unloaded run tests may be insufficient for evaluating aerobic capacity in military field operations.