Avtor/Urednik		Valenčič, Vojko; Djordjevič, Srdjan; Godina, Nada
Naslov		Comparision of biomechanical characteristics of musculus biceps brachii before and after acute physical exercise in human
Tip		članek
Vir		In: Zajc B, editor. Zbornik 7. elektrotehniške in računalniške konference ERK'98. Zvezek B. Računalništvo in informatika, umetna inteligenca, robotika, razpoznavanje vzorcev, biomedicinska tehnika, močnostna elektrotehnika, didaktika, študentski članki; 1998 sep 24-26; Portorož. Ljubljana: Slovenska sekcija IEEE,
Leto izdaje		1998
Obseg		str. 363-6
Jezik		eng
Abstrakt		The problem is how to access the effect of the exercise by simple and non-invasive measurement method. The two main contractile properties, relative force and velocity of the biceps brachii muscle, are assessed by measurement based on magnetic displacement sensor measuring the muscle belly response. The biomechanical characteristics such as force and velocity of skeletal muscles, are of great importance in sport and medicine. These characteristics are significantly influenced by acute physical exercise.The measurements were performed in set of 10 healthy male individuals from 21 to 32 years old. Bipolar electrodes are applied in order to elicited single muscle response. The time response of muscle contraction is analysed, typical parameters are extracted and evaluated by statistical methods. Variability of the new method is compared to method that is widely used. With proper evaluation of the measuring results influence of measuring errors can be lower. It has been estimated by previsous study that varabiability of displacement sensor with electrical stimulation (ES) is 15-33% and 5-16% for maximal voluntary contraction (MVC). The measurements wee performed before exercise and repeated 2, 4, 6 10 and 20 minutes after physical exercise. The maximal fatigue due to exercise of biceps brachii muscle were achieved by dominant concentric volitonal contraction of m. biceps brachii under condition that the arm is loadrd by weight of 6 kg. The time of exercise slightly varied for each individual. THe fatigue was achieved after about 3 up to 5 minutes of activity. The threshold of stimulating voltage, contraction time, sustain time, and half relaxation time are analysed as parameters of responses. The results show significant increase of stimulating threshold voltages and decrease of contraction time and sustain times.(Abstract truncated at 2000 characters.)
Deskriptorji		BIOMECHANICS MUSCLE, SKELETAL EXERCISE MUSCLE CONTRACTION MUSCLE FATIGUE ADULT ELECTRIC STIMULATION ARM MUSCLE RELAXATION