PURPOSE: The purpose of the present study is twofold: 1.) Examine the effects of 10-weeks of an introductory judo course on postural control during maximal bilateral isometric handgrip testing using different stance conditions and lower body power performance, and 2.) To analyze the relationship between maximal bilateral handgrip exertions on postural control during varied stance conditions. METHODS: Twenty recreationally active men and women divided into two an experimental group, (JDO) (n = 10; 21.70 ± 3.83 y; 169.91 ± 6.01 cm; 73.89 ± 12.10 kg; 19.01 ± 8.06% BF), and a control group, (CON) (n = 10; 21.50 ± 2.84 y; 170.06 ± 8.28 cm; 76.62 ± 12.03 kg; 22.41 ± 6.64% BF), participated in this study. Both groups completed pretesting, performing nine randomly assigned experimental trials measuring center of pressure (COP) variables during the performance of a bilateral reactionary gripping task using varied stance conditions. Each trial consisted of bilateral maximal voluntary contractions (MVC) measured simultaneously with a handgrip dynamometer, three times with a neutral (N), dominant foot forward (D), and non-dominant (ND) foot forward stance. Furthermore, participants performed three bilateral countermovement jumps (CMJ) trials. All trials were completed while standing on a portable force platform, which was used, in conjunction with corresponding software, to track COP amplitude in the mediolateral (COPML) and anteroposterior (COPAP) directions, COP mean velocity (MV), and COP area (AREA) while gripping the dynamometer, and ground reaction forces, peak force (CMJPKF), peak power (CMJPP), and rate of power development (CMJRPD), during CMJ performance. Subjects were instructed to grasp the dynamometers as forcefully as possible for ∼5-sec during each trial. All trials were separated by a recovery period of 60-sec. A Waterloo Handedness and Footedness Questionnaire was used to determine subject upper and lower body laterality. Participants repeated the testing protocol following the conclusion of the 10-week course. RESULTS: No significant interactions were observed in MVC strength of the DOM and NON hands during any of the three stance conditions following the 10-week judo course. Furthermore, no significant interactions were observed for any of the COP variables. However, a significant main effect of stance was observed for COPML, MV, and AREA. Results did reveal that CMJPP significantly improved in the JDO group (PRE: 3584.70 ± 716.59W - POST: 3750.10 ± 699.61W) following the 10-week judo course, while no change was observed in the CON group (PRE: 3693.10 ± 1083.77W – POST: 3654.40 ± 1023.94W). However, no change was seen in CMJPKF or CMJRPD. CONCLUSIONS: The results of this investigation indicate that 10-weeks of an introductory judo course may increase CMJPP, however, has no effect on postural control or bilateral MVC strength of the DOM and NON hand during varied stance conditions. Furthermore, results reveal that bilateral MVC exertion has no influence on postural control performed during varied stance conditions.


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Graduation Date





Fukuda, David


Master of Science (M.S.)


College of Education and Human Performance


Educational and Human Sciences

Degree Program

Sport and Exercise Science; Applied Exercise Physiology









Release Date

May 2016

Length of Campus-only Access


Access Status

Masters Thesis (Open Access)