Figure 8. Computed fractional changes in muscle length.

A, computed fractional changes in length of the parasternal intercostal muscles in interspaces 2–5 during passive inflation from FRC to TLC. B, computed fractional changes in length of the triangularis sterni muscle in interspaces 2–6 during the same inflation. The changes in muscle length are expressed as percentage changes relative to the muscle length at FRC (L_FRC); negative changes in length represent muscle shortening, and positive changes in length represent muscle lengthening. Same conventions as in Fig. 4.