Assessments of Ground Reaction Force and Range of Motion in Terms of Fatigue during the Body Weight Squat

Berkant Erman, Mehmet Zeki Ozkol, Jelena Ivanović, Hakan Arslan, Marko Ćosić, Yasin Yuzbasioglu, Milivoj Dopsaj and Tolga Aksit
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Berkant Erman: Department of Sport Health Sciences, Institute of Health Sciences, Ege University, 35050 Izmir, Turkey
Mehmet Zeki Ozkol: Coaching Education Department, Faculty of Sport Sciences, Ege University, 35050 Izmir, Turkey
Jelena Ivanović: Serbian Institute of Sport and Sports Medicine, 72 Kneza Višeslava Street, 11030 Belgrade, Serbia
Hakan Arslan: Department of Sport Health Sciences, Institute of Health Sciences, Ege University, 35050 Izmir, Turkey
Marko Ćosić: Theory of Sports Training, Faculty of Sport and Physical Education, University of Belgrade, 11000 Belgrade, Serbia
Yasin Yuzbasioglu: Coaching Education Department, Faculty of Sport Sciences, Ege University, 35050 Izmir, Turkey
Milivoj Dopsaj: Faculty of Sport and Physical Education, University of Belgrade, 11000 Belgrade, Serbia
Tolga Aksit: Coaching Education Department, Faculty of Sport Sciences, Ege University, 35050 Izmir, Turkey

IJERPH, 2021, vol. 18, issue 8, 1-12

Abstract: The purpose of this study was to analyse in detail body weight squat (BWS)’ fatigue effect on the range of motions (ROM) of the hip, knee, ankle and ground reaction forces (GRF). Twenty male recreational athletes (24.0 ± 3.1 years, 178.85 ± 7.12 cm and 78.7 ± 11.45 kg) participated in this study. BWS were performed on four load cell platforms until the participants failed to continue. Participants performed 73 ± 27 repetitions and the duration to complete of the repetitions was 140.72 ± 62.28 s during the BWS exercise. The forefoot and hindfoot of the feet were on two load cells, thus, there were two under each foot. All of the data collected was divided into three sections for analysis (24 ± 9 repetitions for each). In terms of GRF of the fore feet and hind feet, significant differences and medium to large effect size were found between each section ( p = 0.006~0.040, ES = 0.693~0.492). No significant differences were found between right and left leg in all sections. Significant differences were found in the ROM of the hip between the sections of first-third ( p = 0.044, ES = 0.482) and second-third ( p = 0.034, ES = 0.510), the ROM of the knee first-third ( p = 0.014, ES = 0.602) and second-third ( p = 0.005, ES = 0.701) and for the ROM of the ankle first-second ( p = 0.045, ES = 0.479). As a result, end-of-exercise fatigue caused an increase in the ROM of the hip, knee and ankle. Thus, it is observed that fatigue induced increased ROM, also increases the GRF towards the forefeet.

Keywords: angular kinematic; weight distribution; foot position; performance (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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