Johnson, Camille
(2020)
The Interactive Effects of Load Carriage Magnitude and Gait Velocity on the Tibiofemoral Joint Kinematics in Recruit-Aged Women.
Master's Thesis, University of Pittsburgh.
(Unpublished)
Abstract
Load carriage is a common military training activity that is important for ensuring warfighters’ operational readiness and their ability to safely perform military-relevant tasks. Female soldiers may respond differently to this increased demand and should be included in the existing body of research to inform training and injury prevention practices. PURPOSE: To determine the interactive effects of load carriage magnitude and marching velocity on tibiofemoral arthrokinematics in a population of physically active recruit-aged women. METHODS: Twelve physically active females walked, ran and force marched on an instrumented treadmill under three loading conditions: unloaded, +25%, and +45% bodyweight (BW). Biplane radiographs were collected of each participant’s right knee. Custom model-based tracking software was used to match CT-generated bone models to each pair of synchronized biplane radiographs to recreate in vivo bone motion during the dynamic movement. Two-way repeated measures ANOVA were used to compare tibiofemoral kinematics, medial and lateral compartment minimum gap, and normalized compartmental contact path length at 0, 10, 20, and 30% right leg support between load and velocity conditions (α=0.05). Bonferroni-corrected p-values were used to determine the significance of pairwise comparisons between load and velocity conditions (α=0.05). RESULTS: Knee flexion increased during forced marching and running compared to walking. Increasing load decreased tibiofemoral gap for the medial and lateral compartments at 10% and 20% of the support phase during running. Joint space decreased by 1.0 mm in both compartments when running as compared to forced marching. A significant interaction between load magnitude and velocity was found for lateral compartment minimum gap, at 30% of stance phase. CONCLUSION: Load carriage magnitude was the most influential factor affecting tibiofemoral joint space, while increased gait velocity affected knee flexion and dynamic joint space at select portions of the early support phase. Limited interaction effects were observed between the increase in load carriage and locomotion velocity.
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| Item Type: |
University of Pittsburgh ETD
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| Status: |
Unpublished |
| Creators/Authors: |
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| ETD Committee: |
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| Date: |
14 January 2020 |
| Date Type: |
Publication |
| Defense Date: |
18 November 2019 |
| Approval Date: |
14 January 2020 |
| Submission Date: |
16 December 2019 |
| Access Restriction: |
1 year -- Restrict access to University of Pittsburgh for a period of 1 year. |
| Number of Pages: |
122 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
School of Health and Rehabilitation Sciences > Sports Medicine and Nutrition |
| Degree: |
MS - Master of Science |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
knee, biomechanics, military, load, locomotion |
| Date Deposited: |
26 Aug 2020 12:45 |
| Last Modified: |
14 Jan 2021 06:15 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/38043 |
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