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Carrying loads while walking increases tibial compression, potentially leading to stress fractures. However, these increased forces on the tibia may not directly correlate with vertical ground reaction forces (GRFs).

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Area of Science:

  • Biomechanics
  • Orthopedics
  • Sports Medicine

Background:

  • Sustained walking with body-borne load is common in occupational and recreational activities.
  • Tibial stress fractures are a concern in individuals undertaking such activities.
  • Understanding the relationship between load carriage, tibial forces, and ground reaction forces is crucial for injury prevention.

Purpose of the Study:

  • To investigate if sustained walking with added body-borne load increases tibial compression.
  • To determine if increased tibial compression is associated with vertical ground reaction forces (GRFs).

Main Methods:

  • Thirteen participants walked at 1.3 m/s for 60 minutes with varying loads (0, 15, 30 kg).
  • Tibial compression (maximum and impulse) and vertical GRF measures (peak, impulse, impact peak, loading rate) were recorded.
  • Repeated Measures ANOVA and correlation analyses were used to analyze the data.

Main Results:

  • Both tibial compression and vertical GRF measures increased significantly with added body-borne load.
  • Time affected impact peak and loading rate, but not other GRF or tibial compression measures.
  • The relationship between tibial compression and vertical GRFs was negligible to moderate, suggesting they do not directly drive each other.

Conclusions:

  • Sustained walking with body-borne load elevates tibial compression.
  • Increased tibial compression may contribute to the risk of tibial stress fractures.
  • Vertical GRFs do not appear to be the primary driver of increased tibial compression during load carriage.