![]() Since the knee joint is one of the major contributors to sprinting and vertical jumping, several studies have attempted to correlate these tests, but with different results. Wrigley claimed that isokinetic tests of the knee flexors and extensors are reliable and sensitive enough to investigate the variation in the strength of soccer players. ![]() In isokinetic testing, lower concentric angular velocities are most often used for measuring maximum strength and higher concentric angular velocities (with a higher number of repetitions) for determining stamina. One of the most reliable and commonly used methods of evaluating the level of muscle strength is isokinetic dynamometry. Therefore, the isokinetic assessment of muscle strength (predicting the state of muscle strength) is of particular importance in football games. , greater strength is associated with enhanced force-time characteristics (e.g., rate of force development and capability of producing external mechanical power), which is a requirement of sprinting, change of direction, jumping, and soccer-specific skills. An efficient training process leads to an increase in motor abilities and technical skills, and thus the achievement of specific adaptive changes in the body usually takes place based on increasing the player’s strength potential. In addition, monitoring the parameters of motor fitness and related technical skills will allow the identification of the strengths and weaknesses of players in terms of their motor functioning and their direct participation in the game. In this connection, regular monitoring of the most important training data of motor fitness, especially during the preparation period, is important for the structural improvement, progression of performance, and above all, it allows one to reduce the occurrence of injuries. Īll of these factors can be key determinants of a successful soccer performance, and therefore it may be important not only to assess basic qualities of these skills but, above all, to rationally apply training to develop these abilities. However, such a low percentage of covered running distance seems to be the most critical and decisive movement structure influencing the performance (results) of the soccer game. According to Krustrup, sprints and high-intensity efforts, including dribbling, jumps, and kicking, account for about 10–15% of the total activity on the field. Additionally, a soccer game requires technical skill and tactical awareness, of which the implementation and performance depend largely on the player position, and the league that the player is in. These actions occur when the intensity of movement changes, along with jumping, kicking, and tackling movements. It also includes multi-faceted and continuous changes of direction, which are characterized by dynamic actions related to forward and backward running and lateral movements. ![]() Strength, speed, and anaerobic power, especially of the lower limbs, strongly affect other motor activities. Soccer is all about intermittent high-intensity exercises. Additionally, this experiment may also indicate that the measurement of isokinetic knee flexion and extension peak is effective when performed at the correct angular velocity in relation to the evaluation of the intended motion structure. One of the main reasons for the lack of high dependence of the above-mentioned factors are that the measurements were performed during the initial training period where the level of individual abilities is at a low level. Due to sport-specific demands of soccer activities measured in this experiment, the relationships between peak torque (PT) and the 30 m sprint, T-Test of agility, and power of vertical jumps (SJ and CMJ) were low or medium at speeds of 60°/s and 300°/s. Explosive power was quantified by performing the squat jump (SJ) and countermovement (CMJ), using the force platform. The forward, lateral, and backward movements were assessed using the T-Test of agility. Sprint performance was assessed in the 30 m sprint test (standing start). The isokinetic concentric torque of the knee extensors and flexors was measured at 300°/s, 180°/s, and 60°/s velocities. Twenty-one players (age: 24.5 ± 3.9 years body mass: 76.7 ± 4.7 kg and body height: 183.5 ± 5.5 cm) playing in the highest Polish soccer league participated in the study. ![]() The aim of this study was to determine the relationship between the isokinetic characteristics of knee extensors and flexors with selected motor abilities: Speed, agility, and explosive power of lower extremities of professional football players in the preparation period of a yearly training cycle.
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