Table 2.

Mean (± S.E.) percent type II fibers as determined by stereological methods (area) and by direct count, and ratio of type II to type I mean fiber diameters and cross-sectional areas for respiratory muscles of bottlenose dolphins (Tursiops truncatus). Values are reported for alkaline myosin ATPase.

Muscle	% Type II Fibers by Area	% Type II Fibers by Count	Diameter II:I	Cross-Sectional Area II:I
Scalenus	61.2 ± 2.1	57.6 ± 1.6	1.1	1.3
Sternohyoid	88.5 ± 1.3	78.9 ± 2.0	1.4	1.8
Sternocephalicus	72.8 ± 2.2	57.5 ± 1.7	1.4	2.0
Rectus abdominis - cranial	77.4 ± 3.7	63.0 ± 4.9	1.5	2.1
Rectus abdominis - umbilicus	75.6 ± 1.9	58.2 ± 3.5	1.5	2.3
Rectus abdominis - caudal	74.3 ± 2.0	60.8 ± 2.2	1.3	1.7