Equipment: Computerized Exercise System (Ariel, USA); force platform (Kistler, Switzerland); Computerized pendulum system (local make); photocell system for measuring ball velocity (Poltiming; Poland); accelerometer (RFT, Germany); work station for measuring muscle torques under static conditions (local make). Research methods: Measurements of torques of 10 principal muscle groups under static conditions; force-velocity characteristics of isolated muscle groups and of kinematic chains; measurements of force; velocity and power of legs and trunk in selected laboratory exercises; power spectrum analysis of physiological tremor; measurements of the average linear ball velocity; measurements of the maximal power output of lower limbs by using the Computerized pendulum system. Principal subject: Analysis of static and dynamic characteristics of human motor apparatus. Current research: Project: Gender differences in maximal muscle strength and power in elite athletes. Project: Strenght distribution among muscle groups in athletes representing various sports. Project: Exercise induced changes in physiological tremor. Research achievements: Significant differences were found between variables describing the jumping performance (especially maximal power and height of jump) in different tests (CMJ, CMJ with arms akimbo, SJ with arms akimbo). Groups of highly experienced, elite athletes engaged in combat sports (boxing, judo, karate, Greco-Roman and Free style wrestling) differed from each other regarding the sums of maximal isometric strength of 10 main muscle groups. Highest values of the sum of maximal muscle torques were found in Free style wrestlers and lowest in boxers. It was shown that the post-exercise increases in long-amplitude of hand termor in elite kayakerswere affected both by cortisol and testosterone plasma levels. A high cortisol concentration seemed to inhabit appearance of increased tremoramplitude while a high testosterone level seemed to enhance it. It was also demonstrated that the high cortisol concentration prolongs termor recovery. This was demonstrated that the maximal strenght measured under static condition in male judoists (young and adults) was significantly higher than that measured in females. However, gender differences (34% and 36% for young and adults, respectively) were distinctly smaller when strength was expressed relative to body mass (18% and 17% for young and adults, respectively). Among athletes aged 13 - 16 years practicing tennis, boys attained significantly higher values of maximal power (3 short-lasting laboratory tests) and isometric strength (lower limb muscles) than girls. Highest values of maximal power output attained by young tennis players were lower by about 21 % (boys) to 36% (girls) from those generated by advanced male players. Significant correlations between maximal power output in the vertical jump (CMJ) test and maximal muscle torques (under static conditions) of lower limb muscles were found in a group of 26 young male athletes representing various sports (speed skating, fencing, boxing; tennis). These relationships support the view that in short-lasting efforts the power output of lower limbs is dependent on maximal strength. Applied research: Biomachanical assesment of the human neuromuscular performance. Longitudinal measurements of strength and mechanical power output (especially lower limb muscles) in elite athletes practising various sports. Sports studied: Boxing, judo, fencing, figure skating, skiing, tennis, handball, volleyball, taekwon-do, snowboard, canoeing, ski jumping and luge.