Inese Pontaga1, Janis Zidens2
1Department of Anatomy, Physiology, Biochemistry and Hygiene, Latvian Academy of Sports Education, Latvia
2Department of Sport Games of Latvian Academy of Sports Education, Latvia
Background and Study Aim. Changed thigh muscles action balance can cause sports injuries. The aim of our investigation was the knowledge about effect of thigh muscles fatigue resistance on the knee flexor (Fl)/ extensor (Ext) muscles mean work (W) and power (P) ratio.
Material and Methods. Fourteen amateur male handball players participated The tests were carried out by a dynamometer system using the knee isokinetic flexion?extension movements at angular velocity of 90°/s (five repetitions) and 240°/s (20 repetitions) by the concentric contractions. The mean thigh muscles W, P and Fl/Ext muscles mean W and P ratios were calculated for the first ten and last ten repetitions. The correlation between the thigh muscles peak torques (?max) at the velocity of 90°/s, 240°/s and W, P at the first and last ten repetitions was determined.
Results. Mean W produced by the knee Fl in the last ten movements was smaller than in the first ten motions (p<0.02). The knee WFl/WExt=0.69; PFl/PExt=0.65 in the last ten motions were lower than in the first ten movements: WFl/WExt=0.73; PFl/PExt=0.71 (p<0.002). Therefore the knee joint trauma may occur more probably after fatigue appearance. The positive correlation between thigh muscles ?max and W, P in the first ten and last ten knee movements (p<0.01) confirms that strength training of muscles will improve not only the maximal strength but also the fatigue resistance.
Conclusion. The significant positive correlation between thigh (hamstrings and quadriceps femoris) muscles peak torques and the mean work and power of the same muscles in the first ten and last ten knee flexion?extension movements (p<0.01) confirms that the strength training of these muscle groups will improve not only the maximal strength but also the fatigue resistance of these muscles.
Key words: flexion?extension movement ? handball ? knee ? strength and power balance
Published online: 17 September 2015
Copyright: ? 2015 the Authors. Published by Archives of Budo
Contributors: Inese Pontaga, Janis Zidens conceived the study design. Inese Pontaga, Janis Zidens collected the data. Inese Pontaga analysed the data. Inese Pontaga, Janis Zidens prepared the manuscript. Inese Pontaga secured the funding.
Funding: This study was supported by nobody.
Conflict of interest: Authors have declared that no competing interest exists
Ethical approval: The experiments reported in the article were undertaken in compliance with the current laws of the Latvia. The study was performed in accordance with the standards of the Ethics Committee of the Latvian Council of Sciences.
Provenance and peer review: Under responsibility of HMA Congress
Corresponding author: Inese Pontaga, Department of Anatomy, Physiology, Biochemistry and Hygiene, Latvian Academy of Sports Education, Brivibas Street 333, Riga, LV 1006, Latvia; e-mail: inese.pontaga[at]lspa.lv
Open Access License: This is an open access article distributed under the terms of the Creative Commons Attribution-Non-commercial 4.0 International (http://creativecommons.org/licenses/by-nc/4.0/), which permits use, distribution, and reproduction in any medium, provided the original work is properly cited, the use is non-commercial and is otherwise in compliance with the license