The problem of this study was the analysis of the pectoralis major during six antigravity exercises using electromyographc techniques. Thirty male subjects were used for the investigation from physical education classes at North Texas State University during the spring of 1976.

Title: Assessment of the timing of tennis strokes using kinematic analysis and surface electromyography Aims: Assess the timing of tennis forhand, service and appropriate training exercises using kinematic analysis. Describe the activation of muscles in time for the chosen execution of the strokes by recording surface electromyography (SEMG). Compare the results of various executions and describe the differences between using the racquets with different parameters and between executions of various training exercises. Method: Case study using kinematic analysis and surface electromyography was made. Results: We have found out that the execution of the strokes using the players own racquet was the most stable. We have found the differences in timing while using various racquets. The heavier the equipment we are using in training exercise is the more different is the timing of this movement. We concluded that the chosen training exercises are inappropriate as the special exercises to improve coordination. Key words: tennis, timing, service, forhand, electromyographic analysis, kinematic analysis

Title: Electromyographic analysis of the influence of vibrating dumbbell on upper extremity muscles Objective: The main purpose of this study was to compare the electric activity of m. biceps and triceps brachii, and upper and lower part of m. trapezius, during exercises both with a vibrating dumbbell, and a dumbbell without vibrations. Furthermore, our objective was to compare the muscle activity during static stress (dumbbell kept in one position), and dynamic stress with the vibrating dumbbell (moving in the elbow joint). Methods: Surface electromyography was chosen as an objectification method. Nine healthy women of age between 23 and 26 years participated in this study. A dumbbell of 1, 5 kg weight, 36 Hz vibrating frequency and 1,3 mm amplitude was used. Results: An increase of electrical activity can be observed in all assessed muscles when stimulated with vibrations. However, this increase can be considered as statistically significant only in case of static stress of the m. biceps and triceps brachii. Results also indicate high activity of the upper part of m. trapezius during exercise with activated vibrations. Key words: vibrations, vibrating dumbbell, vibration training, electromyographic analysis

Title: Analysis of electromyographic activity of selected muscles in exercises on selected balance surfaces. Objective: The objective of this dissertation was to document, compare and analyze electromyographic activity of m. gluteus maximus et medius, of m. erector spinae at the level L3 and of m. quadriceps vagus medialis et lateralis in exercises on selected unstable surfaces - on a cylindrical board and in balance sandals. Methods: The work was elaborated as a pilot study. Surface electromyography was used for objectification. The researched group consisted of 7 volunteers (5 women and 2 men), who had no serious injuries and surgeries in their anamnesis and none of them did any sports for a long period. Electromyographic activity of the above mentioned muscles was compared when doing two clearly defined exercises (stand on one lower extremity and hovering/gait on the spot) in balancing sandals and on a cylindrical board in sagittal plane. Results: The results only confirmed two hypotheses out of five ones. Namely it was the hypothesis no. 2 that the lowest activity of m. gluteus maximus was reached while doing exercise no. 3 - hovering/gait on the spot on a cylindrical board and the hypothesis no. 3 that the highest activity of m. erector spinae was reached while doing exercise no. 4 -...