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Increases in myofibrillar ATPase intermediate human skeletal muscle fibers in response to endurance training
Author(s) -
Schantz Peter,
Henriksson Jan
Publication year - 1983
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.880060803
Subject(s) - myofibril , endurance training , skeletal muscle , fiber , atpase , muscle biopsy , medicine , concordance , anatomy , biopsy , muscle fibre , chemistry , biochemistry , enzyme , organic chemistry
The response of human muscle triceps brachii (TB) to training, which consisted of skiing with sledges 500 miles over a period of 36 days, has been investigated by means of histochemical fiber typing (myofibrillar ATPase, n = 7). Muscle biopsies were taken in the right TB during pretraining, and in the right as well as in the left TB after training. The percentage of type 2 fibers and intermediate fibers (type 2C and 1B) in the right TB decreased and increased, respectively, by 13%. The fiber type distribution in the left TB after training was very similar to that in the right TB after training. This concordance indicates that the change in fiber type distribution was a result of the training per se, and not related to any eventual effect of the biopsy‐sampling.