Ram Haddas1, Troy Hooper2, C Roger James2, Phillip S Sizer2. 1. Texas Back Institute Research Foundation, Plano. 2. Texas Tech University Health Sciences Center, Center for Rehabilitation Research, School of Health Professions, Lubbock.
Abstract
CONTEXT: Volitional preemptive abdominal contraction (VPAC) during dynamic activities may alter trunk motion, but the role of the core musculature in positioning the trunk during landing tasks is unclear. OBJECTIVE: To determine whether volitional core-muscle activation incorporated during a drop vertical jump alters lower extremity kinematics and kinetics, as well as trunk and lower extremity muscle activity at different landing heights. DESIGN: Controlled laboratory study. SETTING: Clinical biomechanics laboratory. PATIENTS OR OTHER PARTICIPANTS: Thirty-two young healthy adults, consisting of 17 men (age = 25.24 ± 2.88 years, height = 1.85 ± 0.06 m, mass = 89.68 ± 16.80 kg) and 15 women (age = 23.93 ± 1.33 years, height = 1.67 ± 0.08 m, mass = 89.68 ± 5.28 kg). INTERVENTION(S): Core-muscle activation using VPAC. MAIN OUTCOME MEASURE(S): We collected 3-dimensional ankle, knee, and hip motions, moments, and powers; ground reaction forces; and trunk and lower extremity muscle activity during 0.30- and 0.50-m drop vertical-jump landings. RESULTS: During landing from a 0.30-m height, VPAC performance increased external oblique and semitendinosis activity, knee flexion, and knee internal rotation and decreased knee-abduction moment and knee-energy absorption. During the 0.50-m landing, the VPAC increased external oblique and semitendinosis activity, knee flexion, and hip flexion and decreased ankle inversion and hip-energy absorption. CONCLUSIONS: The VPAC performance during landing may protect the anterior cruciate ligament during different landing phases from different heights, creating a protective advantage just before ground contact and after the impact phase. Incorporating VPAC during high injury-risk activities may enhance pelvic stability, improve lower extremity positioning and sensorimotor control, and reduce anterior cruciate ligament injury risk while protecting the lumbar spine.
CONTEXT: Volitional preemptive abdominal contraction (VPAC) during dynamic activities may alter trunk motion, but the role of the core musculature in positioning the trunk during landing tasks is unclear. OBJECTIVE: To determine whether volitional core-muscle activation incorporated during a drop vertical jump alters lower extremity kinematics and kinetics, as well as trunk and lower extremity muscle activity at different landing heights. DESIGN: Controlled laboratory study. SETTING: Clinical biomechanics laboratory. PATIENTS OR OTHER PARTICIPANTS: Thirty-two young healthy adults, consisting of 17 men (age = 25.24 ± 2.88 years, height = 1.85 ± 0.06 m, mass = 89.68 ± 16.80 kg) and 15 women (age = 23.93 ± 1.33 years, height = 1.67 ± 0.08 m, mass = 89.68 ± 5.28 kg). INTERVENTION(S): Core-muscle activation using VPAC. MAIN OUTCOME MEASURE(S): We collected 3-dimensional ankle, knee, and hip motions, moments, and powers; ground reaction forces; and trunk and lower extremity muscle activity during 0.30- and 0.50-m drop vertical-jump landings. RESULTS: During landing from a 0.30-m height, VPAC performance increased external oblique and semitendinosis activity, knee flexion, and knee internal rotation and decreased knee-abduction moment and knee-energy absorption. During the 0.50-m landing, the VPAC increased external oblique and semitendinosis activity, knee flexion, and hip flexion and decreased ankle inversion and hip-energy absorption. CONCLUSIONS: The VPAC performance during landing may protect the anterior cruciate ligament during different landing phases from different heights, creating a protective advantage just before ground contact and after the impact phase. Incorporating VPAC during high injury-risk activities may enhance pelvic stability, improve lower extremity positioning and sensorimotor control, and reduce anterior cruciate ligament injury risk while protecting the lumbar spine.
Authors: Mary A Pflum; Kevin B Shelburne; Michael R Torry; Michael J Decker; Marcus G Pandy Journal: Med Sci Sports Exerc Date: 2004-11 Impact factor: 5.411
Authors: Tomás Gallego-Izquierdo; Gerardo Vidal-Aragón; Pedro Calderón-Corrales; Álvaro Acuña; Alexander Achalandabaso-Ochoa; Agustín Aibar-Almazán; Antonio Martínez-Amat; Daniel Pecos-Martín Journal: Int J Environ Res Public Health Date: 2020-07-27 Impact factor: 3.390