title: Effect of Acute Effort on Isometric Strength and Body Balance: Trained vs. Untrained Paradigm.
abstract: Years of training in competitive sports leads to human body adaptation to a specific type of exercise. In judo bouts, maintaining hand grip on an opponent's clothes and postural balance is essential for the effective technical and tactical actions. This study compares changes after maximal anaerobic exercise among judo athletes and untrained subjects regarding 1) maximum isometric handgrip strength (HGSmax) and accuracy at the perceived 50% maximum handgrip force (1/2HGSmax) and 2) the balance of 13 judo athletes at national (n = 8) and international (n = 5) competitive levels and 19 untrained university students. The groups did not differ in age, body height, and weight. Body mass index (BMI) and body composition (JAWON) were evaluated. The Wingate Anaerobic Test (WAnT, Monark 875E) measured recommended anaerobic capacity indices. Hand grip strength (Takei dynamometer) and balance (biplate balance platform) were measured before warm-up (T1), before the WAnT test (T2), and after (T3). Parametric or non-parametric tests were performed after verifying the variable distribution assumption. Judoists had higher BMI and fat-free mass index (FFMI) than the students. The athletes also showed higher relative total work and relative peak power and lower levels of lactic acid. The difference in judoists between HGSmax at T1 and HGSmax at T3 was statistically significant. Before warm-up (T1), athletes showed higher strength (more divergent from the calculated ½HGSmax value) compared to students. Substantial fatigue after the WAnT test significantly deteriorated the body stability indices, which were significantly better in judo athletes at all time points. The findings suggest specific body adaptations in judoists, especially for body composition, anaerobic energy system efficiency, and postural balance. These characteristics could be trained for specifically by judo athletes to meet the time-motion and anaerobic demands of contemporary bouts.
authors.affiliation: Department of Theory of Sport and Kinesiology, University of Physical Education, Cracow, Poland.
authors.forename: Stanisław
authors.initials: S
authors.lastname: Sterkowicz
authors.affiliation: Department of Theory of Sport and Kinesiology, University of Physical Education, Cracow, Poland.
authors.forename: Janusz
authors.initials: J
authors.lastname: Jaworski
authors.affiliation: Department of Theory of Sport and Kinesiology, University of Physical Education, Cracow, Poland.
authors.forename: Grzegorz
authors.initials: G
authors.lastname: Lech
authors.affiliation: Department of Physiology and Biochemistry, University of Physical Education, Cracow, Poland.
authors.forename: Tomasz
authors.initials: T
authors.lastname: Pałka
authors.affiliation: Department of Gymnastics and Dance, University of Physical Education, Cracow, Poland.
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Sterkowicz-Przybycień
authors.affiliation: Department of Theory of Sport and Kinesiology, University of Physical Education, Cracow, Poland.
authors.forename: Przemysław
authors.initials: P
authors.lastname: Bujas
authors.affiliation: Department of Sports Medicine and Human Nutrition, University of Physical Education, Cracow, Poland.
authors.forename: Paweł
authors.initials: P
authors.lastname: Pięta
authors.affiliation: Department of Judo, Sport Club GKS Czarni, Bytom, Poland.
authors.forename: Zenon
authors.initials: Z
authors.lastname: Mościński
mesh_terms: D015308:Anaerobic Threshold; D056352:Athletes; D005260:Female; D006225:Hand / Q000502:physiology*; D018737:Hand Strength; D006801:Humans; D008297:Male; D016139:Martial Arts; D010807:Physical Endurance; D004856:Postural Balance; D055815:Young Adult