Types of muscle fibers in skeletal muscles of persons not engaging in physical work or sports

Composition of muscle fibers (MF) has been analysed in the m. externus lateralis femoris in 52 volunteers (34 men and 18 women), who do not go in for sports and do not work physically. The following average amount of MF contents has been revealed: the type I--50%, the type II-A--20%, the type II-B--30%. In men amount of the type I MF is somewhat less and that of the type II-A--more than in women.