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First published online July 2, 2004
Journal of Experimental Biology 207, 2811-2821 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.01115
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Aerobic characteristics of red kangaroo skeletal muscles: is a high aerobic capacity matched by muscle mitochondrial and capillary morphology as in placental mammals?

Terence J. Dawson*, Brock Mifsud, Matthew C. Raad and Koa N. Webster

School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW 2052, Australia



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  		Fig. 1. The outline of a red kangaroo showing the delineation of the body regions from which muscle samples were taken.

 


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  		Fig. 2. The principal muscles of (A) the hindleg (superficial) and (B) the lumbar region of the red kangaroo. Numbers indicate muscles: 1, biceps femoris (cranial); 2, biceps femoris (caudal); 3, caudofemoralis (caudal); 4, caudofemoralis (cranial); 5, coccygeus; 6, crural muscles including gastrocnemius; 7, erector spinae; 8, gluteus medius; 9, gluteus profundus; 10, gluteus superficialis; 11, gracilis; 12, multifdi lumborum; 13, sacrocaudalis dorsalis; 14, sacrocaudalis dorsalis lateralis; 15, sacrocaudalis ventralis; 16, sartorius; 17, semitendinosus; 18, vastus lateralis.

 


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  		Fig. 3. Relationship in red kangaroo muscles between (A) mitochondrial volume density V(mt,f) and the capillary blood supply per ml of mitochondria V(c)/V(mt,m), and (B) mitochondrial volume density V(mt,f) and the capillary blood supply per g of muscle V(c)/gMm. Data for individual muscles are derived from Table 2.

 


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  		Fig. 4. The relationship between the total mitochondrial volume of skeletal muscle [V(mt,m)/Mb] and maximum aerobic capacity O2max in a series of mammalian species. Values for red kangaroo and human are indicated. The values for human and other placental species are from Hoppeler (1990Go); value for red kangaroo is from Table 4. The addition of the red kangaroo data to the quadruped data does not significantly change the relationship between O2max and V(mt,m)/Mb.

 

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© The Company of Biologists Ltd 2004