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Instruction and jump-landing kinematics in college-aged female athletes over time.

Abstract：

CONTEXT:Instruction can be used to alter the biomechanical movement patterns associated with anterior cruciate ligament (ACL) injuries. OBJECTIVE:To determine the effects of instruction through combination (self and expert) feedback or self-feedback on lower extremity kinematics during the box-drop-jump task, running-stop-jump task, and sidestep-cutting maneuver over time in college-aged female athletes. DESIGN:Randomized controlled clinical trial. SETTING:Laboratory. PATIENTS OR OTHER PARTICIPANTS:Forty-three physically active women (age = 21.47 ± 1.55 years, height = 1.65 ± 0.08 m, mass = 63.78 ± 12.00 kg) with no history of ACL or lower extremity injuries or surgery in the 2 months before the study were assigned randomly to 3 groups: self-feedback (SE), combination feedback (CB), or control (CT). INTERVENTION(S):Participants performed a box-drop-jump task for the pretest and then received feedback about their landing mechanics. After the intervention, they performed an immediate posttest of the box-drop-jump task and a running-stop-jump transfer test. Participants returned 1 month later for a retention test of each task and a sidestep-cutting maneuver. Kinematic data were collected with an 8-camera system sampled at 500 Hz. MAIN OUTCOME MEASURE(S):The independent variables were feedback group (3), test time (3), and task (3). The dependent variables were knee- and hip-flexion, knee-valgus, and hip- abduction kinematics at initial contact and at peak knee flexion. RESULTS:For the box-drop-jump task, knee- and hip-flexion angles at initial contact were greater at the posttest than at the retention test (P < .001). At peak knee flexion, hip flexion was greater at the posttest than at the pretest (P = .003) and was greater at the retention test than at the pretest (P = .04); knee valgus was greater at the retention test than at the pretest (P = .03) and posttest (P = .02). Peak knee flexion was greater for the CB than the SE group (P = .03) during the box-drop-jump task at posttest. For the running-stop-jump task at the posttest, the CB group had greater peak knee flexion than the SE and CT (P ≤ .05). CONCLUSIONS:Our results suggest that feedback involving a combination of self-feedback and expert video feedback with oral instruction effectively improved lower extremity kinematics during jump-landing tasks.

journal_name

J Athl Train

journal_title

Journal of athletic training

authors

Etnoyer J,Cortes N,Ringleb SI,Van Lunen BL,Onate JA

doi

10.4085/1062-6050-48.2.09

subject

Has Abstract

pub_date

2013-03-01 00:00:00

pages

161-71

issue

eissn

1062-6050

issn

1938-162X

journal_volume

pub_type

杂志文章,随机对照试验

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Instruction and jump-landing kinematics in college-aged female athletes over time.