Award Date

5-1-2016

Degree Type

Dissertation

Degree Name

Doctor of Physical Therapy (DPT)

Department

Physical Therapy

Advisor 1

Szu-Ping Lee

First Committee Member

Merrill Landers

Second Committee Member

Kai-Yu Ho

Number of Pages

36

Abstract

Study design: Cross-sectional case control.
 Objectives: The purpose of this study was to investigate the effects of dance experience and movement instruction on lower extremity kinematics and muscle activation during landing tasks Background/Aim: Current research demonstrates that dancers exhibit a much lower incidence of ACL injuries when compared to athletes of other sports despite the fact that dancers jump and land frequently in their training and performance. The mechanism that underlies this disparity is unclear.
 Methods: We analyzed lower extremity biomechanics during landing in 27 subjects (age 18-25 years, 12 dancers and 15 non-dancers). In the non-instructed (NI) conditions, participants were shown a video in which a successful landing was demonstrated. They were then shown the same videos with specific verbal instructions (VI) on how to perform the landings. Surface electromyography (EMG) was used to measure the activation of gluteus maximus and medius during the deceleration phase of landings. Peak hip knee and hip frontal plane angles were acquired using a 3-D motion capture system. Two-way mixed measures ANOVAs were used to assess the effects of group (dancers vs. non-dancers) and instruction (NI vs. VI) on the biomechanical variables.
 Results: During landings, dancers demonstrated greater gluteus maximus activation and maintained generally more neutral hip and knee alignments when compared to non-dancers. A significant interaction showed that instruction led to increased knee valgus angle in non-dancers but not dancers Conclusions: Our findings suggested that dance training experience may lead to safer landing mechanics. Specific acute movement instruction can potentially deteriorate the mechanics of those with no dance training experience.

Keywords

ACL injury; Dancers; Female athletes; Landing; Instruction

Disciplines

Physical Therapy

File Format

pdf

File Size

521 Kb

Degree Grantor

University of Nevada, Las Vegas

Language

English


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