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Skeletal muscle profiles in elite springboard and platform divers

Physiology Laboratory, Division of Orthopaedics, Department of Surgery, the Preventive Cardiology Program, Cardiology Division, Department of Medicine, College of Medicine, University of California, Irvine, California, School of Medicine, University of California, San Diego, California

Vincent J. Caiozzo, MS

Physiology Laboratory, Division of Orthopaedics, Department of Surgery, the Preventive Cardiology Program, Cardiology Division, Department of Medicine, College of Medicine, University of California, Irvine, California, School of Medicine, University of California, San Diego, California

Benjamin D. Rubin, MD

Physiology Laboratory, Division of Orthopaedics, Department of Surgery, the Preventive Cardiology Program, Cardiology Division, Department of Medicine, College of Medicine, University of California, Irvine, California, School of Medicine, University of California, San Diego, California

Carlos A. Prietto, MD

Physiology Laboratory, Division of Orthopaedics, Department of Surgery, the Preventive Cardiology Program, Cardiology Division, Department of Medicine, College of Medicine, University of California, Irvine, California, School of Medicine, University of California, San Diego, California

Dennis M. Davidson, MD

Physiology Laboratory, Division of Orthopaedics, Department of Surgery, the Preventive Cardiology Program, Cardiology Division, Department of Medicine, College of Medicine, University of California, Irvine, California, School of Medicine, University of California, San Diego, California

This investigation determined the vastus lateralis mus cle fiber composition, as well as leg power and strength, in a group of 10 world class divers. Male divers had a low mean percentage of Type I fibers (36%), which was consistent with the functional demands of their sport, whereas females had a mean value of 61 %. The ratio of Type I/Type II cross-sectional fiber area was 0.95 in females and 0.82 in males. Angle-specific torque-veloc ity relationships, derived from Cybex testing of the knee extensors, revealed high torque values in males but not in females. The observed male-female differences have no clear explanation, unless muscle fiber composition has greater importance in the more difficult dives exe cuted by men.

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