Kinematics and kinetics of 2 styles of partial forward lunge.
OBJECTIVE
To evaluate the anterior shift of the body's center of gravity (CG) and the associated inertial forces produced by 2 styles of a partial forward lunge.


METHODS
Gait-analysis laboratory of a research institution.


METHODS
10 healthy volunteers.


METHODS
3 trials of each lunge.


METHODS
Kinematic data were collected, and inertial reaction forces were resolved into net compressive and shear forces using an inverse dynamic model.


RESULTS
Significantly (P < .001) greater anterior translation of the CG was found with an arms-in-front v arms-across-chest lunge style. No significant differences were found between the average peak inertial compressive and shear forces of the 2 styles (427 +/- 184 N v 426 +/- 187 N, -536 +/- 113 N v -538 +/- 127 N).


CONCLUSIONS
Anterior translation of the CG was larger with the arms-forward partial-lunge position, creating increased balance demands. Both styles produced clinically safe (posteriorly directed) inertial shear forces, with greater anterior CG shift with the arms-forward style.
Wilson
Daniel J
DJ
Dept of Health, Physical Education and Recreation, Missouri State University, Springfield, MO 65897, USA.
Gibson
Kyle
K
Masterson
Gerald L
GL
D000328:Adult; D001696:Biomechanical Phenomena; D003627:Data Interpretation, Statistical; D005260:Female; D005684:Gait / Q000502:physiology*; D006801:Humans; D007717:Knee / Q000502:physiology*; D008297:Male; D009119:Muscle Contraction / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D026741:Physical Therapy Modalities; D010865:Pilot Projects; D004856:Postural Balance / Q000502:physiology*; D016059:Range of Motion, Articular / Q000502:physiology*; D033081:Shear Strength