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J Appl Physiol 82: 354-358, 1997;
8750-7587/97 $5.00
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Journal of Applied Physiology
Vol. 82, No. 1, pp. 354-358, January 1997

rapid communication

Determination of fascicle length and pennation in a contracting human muscle in vivo

Tetsuo Fukunaga, Yoshiho Ichinose, Masamitsu Ito, Yasuo Kawakami, and Senshi Fukashiro

Department of Life Sciences, The University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153, Japan

Received 16 January 1996; accepted in final form 10 September 1996.

Fukunaga, Tetsuo, Yoshiho Ichinose, Masamitsu Ito, Yasuo Kawakami, and Senshi Fukashiro. Determination of fascicle length and pennation in a contracting human muscle in vivo. J. Appl. Physiol. 82(1): 354-358, 1997.---We have developed a technique to determine fascicle length in human vastus lateralis muscle in vivo by using ultrasonography. When the subjects had the knee fully extended passively from a position of 110° flexion (relaxed condition), the fascicle length decreased from 133 to 97 mm on average. During static contractions at 10% of maximal voluntary contraction strength (tensed condition), fascicle shortening was more pronounced (from 126 to 67 mm), especially when the knee was closer to full extension. Similarly, as the knee was extended, the angle of pennation (fascicle angle, defined as the angle between fascicles and aponeurosis) increased (relaxed, from 14 to 18°; tensed, from 14 to 21°), and a greater increase in the pennation angle was observed in the tensed than in the relaxed condition when the knee was close to extension (<40°). We conclude that there are differences in fascicle lengths and pennation angles when the muscle is in a relaxed and isometrically tensed conditions and that the differences are affected by joint angles, at least at the submaximal contraction level.

vastus lateralis muscle; ultrasound; pennation angle; muscle contraction

0161-7567/97 $5.00 Copyright © 1997 the American Physiological Society




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