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Ahamed, N.

Anderst, W.

Connaboy, C.

Dever, D.

Johnson, C.

Krajewski, K.

Mi, Q.

English

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   Load Magnitude and Locomotion Strategy Alters Knee Mechanics in Recruit-Aged Women     Kellen T. Krajewski1, Camille C. Johnson1, Dennis E. Dever1, Nizam U. Ahamed1, Qi Mi1, William J. Anderst2, Chris Connaboy1 1Neuromuscular Research Laboratory, University of Pittsburgh, Pittsburgh, PA, USA 2Biodynamics Laboratory, University of Pittsburgh, Pittsburgh, PA, USA    Female soldiers experience a greater incidence of Knee Osteoarthritis (OA).  A proposed mechanism of OA is ruck marching, involving load carriage at a fast pace.  Knee Total Joint Moment (KTJM) and changes of percent (%) contribution in each plane of motion moment has been linked to OA.  PURPOSE: To determine the interactive effects of load magnitude and locomotion on KTJM % contribution in women.  METHODS:  Twelve healthy females (Age: 24.75  2.17y) completed 3 testing sessions collecting kinematic and kinetic data.  Subjects wore combat boots and weighted vest. Trials were conducted at body weight (BW), and loaded; +25%, +45%. At each load, 2 locomotion types (running [RN] and forced march [FM]) were performed at +10% above their gait transition velocity were performed. KTJM was calculated utilizing Euclidian norm with % contribution derived from KTJM for each plane: Knee Flexion (KF%), Adduction (KA%), and Rotation (KR%), and normalized to system weight. Multifactorial RMANOVA, load by locomotion (3x2), were conducted on Heel strike [HS] and Midstance [MS] data for each plane. Bonferroni-corrected pairwise comparisons were conducted when necessary (α=p<.05). RESULTS: KF% at HS there was an interaction (p<.05). Simple main effect of load (p<.02) during RN; +25% (p<.02) and +45% (p<.01) greater than BW. No simple main effect of load for FM. There was a main effect of locomotion (p=.006), with RN (64.9  4.8%) greater than FM (49.8  2.7%). KF% at MS, there was an interaction (p=.02); RN was greater than FM at all load conditions (p<.04). KA% at HS, there was no interaction (p=.09).  There was a main effect of load (p=.01); BW greater than +25% (p=.03).  KA% at MS there was no interaction (p=.31).  There was a main effect of locomotion (p=.003), with FM (43.8  3.1%) greater than RN (29.9  4.1%).  No significant findings for KR%. CONCLUSION: At HS as load increased KF% increased for the RN, demonstrating appropriate movement response to load increases where the individual relies more on knee flexors/extensors to absorb energy.  No change in KF% between load conditions for FM demonstrates an inability to modulate movement to accommodate to changes in load.   At MS, RN exhibited greater KF% than FM.  Thus, the FM strategy promotes successful task execution over safe task execution even if increased KA% is a consequence, potentially predisposing to OA.    

Load Magnitude and Locomotion Strategy Alters Knee Mechanics in Recruit-Aged Women

https://digitalcommons.wku.edu/cgi/viewcontent.cgi?article=4523&amp;context=ijesab

Load Magnitude and Locomotion Strategy Alters Knee Mechanics in Recruit-Aged Women

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