Military Body Borne Load, but Not Sex Impact on Postural Stability

Document Type

Student Presentation

Presentation Date



College of Health Sciences



Faculty Sponsor

Tyler Brown


Postural stability is necessary to prevent the musculoskeletal injuries suffered by military personnel during occupational activities. During these activities, military personnel don body borne loads greater than 20 kg, that increase injury risk. Yet it is largely unknown if these body borne load impacts dynamic postural stability, particularly for females. Twenty-six (15 male and 11 female) participants (ht: 1.75±0.1m, wt: 76.98±11.57kg) had dynamic postural stability index (DPSI) quantified during a forward jump with four body borne loads (20, 25, 30 and 35 kg). With each load, participants jumped three times over a of box (16.5 cm) and landed with their dominant limb on a force platform. DPSI, which is a composite indices of Medial-Lateral (MLSI), Anterior-Posterior (APSI) and Vertical (VSI) stability, was quantified for 3 seconds following landing. Each DPSI measure was submitted to a RM ANOVA to examine the main effects and interaction of load and sex. Body borne load significantly decreased DPSI (p<0.001), MLSI p<0.001), and VSI (p<0.001), but not APSI (Insert p-value). However, sex had no significant effect on any measure of DPSI. The reduction of postural stability with body borne load may contribute to the high rate of musculoskeletal injury during occupational military activities.

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