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Ann Thorac Surg 1995;59:969-970
© 1995 The Society of Thoracic Surgeons

Invited Commentary

Stanley Salmons, MSc, PhD

British Heart Foundation Skeletal Muscle Assist Research Group Department of Human Anatomy and Cell Biology University of Liverpool Liverpool L69 3BX United Kingdom

The first 20% of the full text of this article appears below.

See also page 961.

Doctor Fritzsche and his colleagues claim to have demonstrated a myotrophic effect of an anabolic steroid on chronically stimulated, but not unstimulated, latissimus dorsi muscles of the sheep. My own experience is the opposite: rabbit tibialis anterior muscle was unusual in showing a marked myotrophic effect, but neither this muscle nor dog latissimus dorsi showed any response when it also was stimulated chronically. Although I am open to the possibility of species and muscle differences, I find the contrary evidence from the present study unconvincing.

I have few problems with the experimental design, although the control animals should have received a placebo injection consisting of the vehicle in which the drug was dispersed. However, contractile speed has been characterized in an unorthodox way that is not very informative to a skeletal muscle physiologist. Contraction time, as normally measured, refers to a single twitch response. Tetanic contraction time depends on both the rate of rise of tetanic tension and the plateau tension reached. The maximum rate of rise of tetanic tension continues to increase with . . . [Full Text of this Article]


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