CONTEXT: Continued research into the mechanism of noncontact anterior cruciate ligament injury helps to improve clinical interventions and injury-prevention strategies. A better understanding of the effects of anticipation on landing neuromechanics may benefit training interventions. OBJECTIVE: To determine the effects of anticipation on lower extremity neuromechanics during a single-legged land-and-cut task. DESIGN: Controlled laboratory study. SETTING: University biomechanics laboratory. PARTICIPANTS: Eighteen female National Collegiate Athletic Association Division I collegiate soccer players (age = 19.7 ± 0.8 years, height = 167.3 ± 6.0 cm, mass = 66.1 ± 2.1 kg). INTERVENTION(S): Participants performed a single-legged land-and-cut task under anticipated and unanticipated conditions. MAIN OUTCOME MEASURE(S): Three-dimensional initial contact angles, peak joint angles, and peak internal joint moments and peak vertical ground reaction forces and sagittal-plane energy absorption of the 3 lower extremity joints; muscle activation of selected hip- and knee-joint muscles. RESULTS: Unanticipated cuts resulted in less knee flexion at initial contact and greater ankle toe-in displacement. Unanticipated cuts were also characterized by greater internal hip-abductor and external-rotator moments and smaller internal knee-extensor and external-rotator moments. Muscle-activation profiles during unanticipated cuts were associated with greater activation of the gluteus maximus during the precontact and landing phases. CONCLUSIONS: Performing a cutting task under unanticipated conditions changed lower extremity neuromechanics compared with anticipated conditions. Most of the observed changes in lower extremity neuromechanics indicated the adoption of a hip-focused strategy during the unanticipated condition.
CONTEXT: Continued research into the mechanism of noncontact anterior cruciate ligament injury helps to improve clinical interventions and injury-prevention strategies. A better understanding of the effects of anticipation on landing neuromechanics may benefit training interventions. OBJECTIVE: To determine the effects of anticipation on lower extremity neuromechanics during a single-legged land-and-cut task. DESIGN: Controlled laboratory study. SETTING: University biomechanics laboratory. PARTICIPANTS: Eighteen female National Collegiate Athletic Association Division I collegiate soccer players (age = 19.7 ± 0.8 years, height = 167.3 ± 6.0 cm, mass = 66.1 ± 2.1 kg). INTERVENTION(S): Participants performed a single-legged land-and-cut task under anticipated and unanticipated conditions. MAIN OUTCOME MEASURE(S): Three-dimensional initial contact angles, peak joint angles, and peak internal joint moments and peak vertical ground reaction forces and sagittal-plane energy absorption of the 3 lower extremity joints; muscle activation of selected hip- and knee-joint muscles. RESULTS: Unanticipated cuts resulted in less knee flexion at initial contact and greater ankle toe-in displacement. Unanticipated cuts were also characterized by greater internal hip-abductor and external-rotator moments and smaller internal knee-extensor and external-rotator moments. Muscle-activation profiles during unanticipated cuts were associated with greater activation of the gluteus maximus during the precontact and landing phases. CONCLUSIONS: Performing a cutting task under unanticipated conditions changed lower extremity neuromechanics compared with anticipated conditions. Most of the observed changes in lower extremity neuromechanics indicated the adoption of a hip-focused strategy during the unanticipated condition.
Authors: Bohdanna T Zazulak; Patricia L Ponce; Stephen J Straub; Michael J Medvecky; Lori Avedisian; Timothy E Hewett Journal: J Orthop Sports Phys Ther Date: 2005-05 Impact factor: 4.751
Authors: Joshua T Weinhandl; Jennifer E Earl-Boehm; Kyle T Ebersole; Wendy E Huddleston; Brian S R Armstrong; Kristian M O'Connor Journal: Clin Biomech (Bristol, Avon) Date: 2013-06-28 Impact factor: 2.063
Authors: Scott C Landry; Kelly A McKean; Cheryl L Hubley-Kozey; William D Stanish; Kevin J Deluzio Journal: Am J Sports Med Date: 2007-10-05 Impact factor: 6.202