Table 1.

Muscle lengths and radii of curvature

Dog No. LFRC, cm L/LFRCr, cm
EIIE occluded FRC EIIE occluded
FRC FRC + ½ ICTLC FRC FRC + ½ IC TLC
Prone
1 5.50.82 0.72 0.79 0.60 4.8 3.9 4.0 3.63.8
2 5.6 0.87 0.78 0.67 0.64 5.46.2 6.6 6.9 7.2
3 5.4 0.86 0.830.74 0.67 3.3 3.1 4.7 4.2 7.6
4 5.1 0.87 0.85 0.71 0.84 5.64.9 5.4 4.6 3.6
Supine
1 6.10.90 0.83 0.60 0.58 5.5 5.4 4.9 3.93.7
2 5.8 0.94 0.84 0.69 0.65 6.86.7 6.6 6.7 6.1
3 6.2 0.94 0.840.70 0.74 4.7 3.9 3.7 3.8 3.9
4 5.7 0.90 0.79 0.72 0.70 6.04.8 4.5 4.4 3.8
Mean 5.6 0.89 0.820.70 0.68 5.3 4.8 5.0 4.8 5.0
SD0.4 0.04 0.04 0.05 0.07 1.0 1.1 1.11.3 1.6
  • Values in prone and supine positions are of muscle lengthL FRC at functional residual capacity (FRC), fractional muscle length L/L FRC at end inspiration (EI) during quiet breathing and during inspiratory effort (IE) against an occluded airway at FRC; one-half inspiratory capacity above FRC (FRC + ½ IC), and at total lung capacity (TLC), and radius (r) of curvature r at each condition.