Increases in Load Carriage Magnitude and Forced Marching Change Lower-Extremity Coordination in Physically Active, Recruit-Aged Women

• DOI: 10.1123/jab.2020-0340
• Publication Date: 2021-05-29T06:15:09Z
• Authors: Dennis E. Dever; Kellen T. Krajewski; Camille C. Johnson; Katelyn F. Allison; Nizam U. Ahamed; Mita Lovalekar; Qi Mi; Shawn D. Flanagan; William J. Anderst; Chris Connaboy
• Keywords: Treadmill; Ankle dorsiflexion; Ground reaction force; STRIDE; Weight-bearing; Backpack

The objective was to examine the interactive effects of load magnitude and locomotion pattern on lower-extremity joint angles intralimb coordination in recruit-aged women. Twelve women walked, ran, forced marched at body weight with loads +25%, +45% an instrumented treadmill infrared cameras. Joint were assessed sagittal plane. Intralimb thigh-shank shank-foot couple continuous relative phase. Mean absolute phase (entire stride) deviation (stance phase) calculated from At heel strike, marching exhibited greater (P < .001) hip flexion, knee extension, ankle plantar flexion compared running. mid-stance, = .007) dorsiflexion .04) increased for all patterns. Forced .009) demonstrated a "stiff-legged" running, evidenced by more in-phase mean values. Running .03) walking .003) had than marching. Deviation running but not With >25% weight, may increase risk injury due inhibited energy attenuation up kinetic chain lack variability disperse force across different supportive structures.