On the course of muscle strength after muscular overstrain

Journal/Book: Int. J. Sports Med. 9: 365 (1988). 1988;

Abstract: Institut für Arbeitsphysiologie und Rehabilitationsforschung der Universität Marburg/Lahn FRG The symptoms of the delayed onset of muscle soreness (DONS) are described in numerous publications however there is less information about the time-course of these symptoms. This is especially true for the development of muscular strength. In this study the arbitrary isometric strength after single dynamic or isometric severe exercise was measured in untrained healthy subjects. The strength was followed up for one or three weeks after the experimental exercise. Additionally the muscle pain was subjectively rated and the serum creatine kinase levels were measured. After a single positive and negative dynamic exercise of 60 minutes the isometric strength of the respective muscles was decreased to 82 % of the initial value (day 2). Until day 7 the strength increased up to 90 % of the initial value (n = 73 p < 0.001 Rep.-Mes. ANOVA). The analysis of strength in respect to the individual soreness ratings after day 4 showed that even the testpersons without overlasting soreness had a significantly decreased strength (about 8%). Therefore the strength loss can not only be caused by pain but exhibits a real functional injury. After 80 isometric 6-sec maximum contractions the muscular strength was decreased as well. Whereas in women the initial values were not reached after two weeks in men there was a slight training effect in the 2nd week after the exercise. However the initial strength loss (day 1) was identical in both sexes.

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