[Interindividual variability and intraindividual reaction stability of bioelectric muscular tension of the long finger flexor in model exercise].
Twelve untrained subjects had to perform opening and closing movements of the hand (2 mm-sec(-1) on a hand ergometer. The load was 2kp for woman and 5 kp for man. Two sequences of the test were carried out, one after the other. The EMG was derived unipolarly from the belly of the Mm. flex. digit, and the mean bioelectrical muscle activity was measured. The following factors were tested in each subject by means of an analysis of variance. Factor A -- phase of exercise, Factor B --repetition of exercise and Factor C -- type of sequence. The analysis of the stability of individual reactions was made through serial correlations. Factor A influenced the mean bioelectrical muscle activity in all subjects while Factors B and C had an influence only in some cases. A significant interaction effect between pairs of factors occurred only in a few subjects. The serial correlation coefficients for Factor A of the same composition is between 0.40 and 0.80. The values of the mean correlation functions for the two sequences of Factor C, C(I) and C(II), are 0.69 and 0.68 respectively. In each subject the range of the cross correlation coefficients of the sequences C(I) and C(II) was between 0.70 and 0.92. Possible causes for the varying experimental results were discussed.
D000328:Adult; D000704:Analysis of Variance; D001674:Bioelectric Energy Sources; D004576:Electromyography; D005260:Female; D005385:Fingers / Q000502:physiology*; D006801:Humans; D008297:Male; D008954:Models, Biological; D009129:Muscle Tonus; D005082:Physical Exertion
Interindividuelle Variabilität und intraindividuelle Reaktionsstabilität der bioelektrischen Muskelspannung der langen Fingerbeuger bei Modellarbeit