Publication Date
5-2020
Date of Final Oral Examination (Defense)
12-10-2019
Type of Culminating Activity
Thesis
Degree Title
Master of Science in Kinesiology
Department
Kinesiology
Supervisory Committee Chair
Shawn Simonson, Ed.D.
Supervisory Committee Member
Tyler Brown, Ph.D.
Supervisory Committee Member
David Hammons, Ed.D.
Abstract
Improving change of direction (COD) with the use of strength training has led to mixed results. To date, the modified single leg squat (MSLS) and the bilateral squat (BS) have been successfully used to improve COD, with equal improvement. COD is primarily performed at a 45-75° frontal plane angle; however, the MSLS and BS are performed at a 90° frontal plane angle. Based on the force vector theory, it is proposed that a more mechanically similar strength training exercise, the Laterally Resisted Split Squat (LRSS), be used. The purpose of this study is to compare COD with the LRSS, MSLS, and the BS via kinetic measurements. Ten healthy and recreationally active female individuals volunteered for this study. Participants were pre-screened using a COD test to verify proper mechanics. Participant’s weight was measured and 1RM (using Bryzcki formula/technique) for the LRSS, MSLS, and BS calculated. Peak ground reaction force (GRF) of participant’s dominant leg in the frontal plane for COD and the three exercises at 70% 1RM was collected and used to calculate peak magnitude and vector angle. Peak GRF magnitude was significantly larger in COD (2.13 ± 0.52 bodyweight: BW) than the LRSS (0.85 ± 0.07 BW; p < 0.001), MSLS (0.99 ± 0.10 BW; p = 0.001), and BS (0.52 ± 0.07 BW; p < 0.001). COD (66.70° ± 4.98°) vector angle was not significantly difference than the LRSS (74.94° ± 4.11°; p = 0.057) as compared to the MSLS (89.04° ± 0.48°; p < 0.001) and BS (82.69° ± 4.30°; p < 0.001). In an application of the force vector theory, the LRSS more closely matches COD than the MSLS or BS.
DOI
10.18122/td/1646/boisestate
Recommended Citation
Maddy, Derek, "Analyzing Change-of-Direction and the Laterally Resisted Split Squat: Incorporating a Lateral Vector into the Single Leg Squat" (2020). Boise State University Theses and Dissertations. 1646.
10.18122/td/1646/boisestate
Included in
Biomechanics Commons, Biophysics Commons, Exercise Science Commons, Kinesiotherapy Commons, Other Kinesiology Commons