Changes in Gait with Anteriorly Added Mass: A Pregnancy Simulation Study

Area of Science:

• Biomechanics
• Human Movement Science
• Pregnancy Studies

Background:

• Pregnancy involves significant maternal structural adaptations, including anterior weight gain.
• Altered body mass distribution during pregnancy can affect gait and increase musculoskeletal strain.

Purpose of the Study:

• To investigate kinematic and kinetic gait alterations in response to simulated pregnancy-related anterior load.
• To analyze the biomechanical effects of varying anterior mass on female locomotion.

Main Methods:

• Twenty healthy females walked on a treadmill under three load conditions: sac-only, 4.5 kg anterior load, and 9.07 kg anterior load.
• Kinematic and kinetic data were collected to assess changes in joint motion and moments.
• Loads simulated second-trimester and full-term pregnancy mass distribution.

Main Results:

• Increased anterior mass led to significant kinematic changes in the sagittal and frontal planes at the knee, hip, pelvis, and trunk.
• Ankle, knee, and hip joint moments increased when normalized to baseline mass but decreased when normalized to total mass.
• These findings suggest adaptive gait modifications in response to increased anterior load.

Conclusions:

• Women alter gait biomechanics to mitigate the effects of anteriorly loaded mass.
• Elevated joint moments indicate increased musculoskeletal stress, potentially contributing to pregnancy-related pain.
• Understanding these biomechanical changes is crucial for managing discomfort during pregnancy.