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. 2014 Jul 11;592(Pt 17):3881–3899. doi: 10.1113/jphysiol.2014.276196

Figure 3. Relationship between the intensities (A and B) and spacings (C and D) of the meridional reflections and the force at the end of the step.

Figure 3

The two values at T/T0 = 1 refer to the exposure either during a tetanus (T0, open circle) or just before each cycle in the step protocol (Ti, filled circle). The second axis scales under C and D are expressed in SI units taking T0 as 183 kPa. Open triangles indicate the intensity and spacing values at rest. Data from five muscles. A, intensities of the myosin-based meridional reflections M3 (violet), M6 (blue), M9 (green), M11 (red) and M15 (black). M9 is not detectable at rest. B, intensity of the actin-based meridional reflection A13. All intensities are normalised by the mean of their values at T0 and Ti (dashed line). C, spacing changes of the myosin-based meridional reflections M6, M9, M11 and M15 with the same colour code as in A (circles); blue crosses are the spacing changes of M6 measured in R. temporaria (from fig S1C in Piazzesi et al. (2007); force values are scaled for the 1.3 times larger T0 (240 kPa) in R. temporaria with respect to R. esculenta, and thus the rightmost cross corresponds to T0). D, spacing changes of the actin-based meridional reflection A13. All spacing changes are calculated as a percentage of the mean between their values at T0 and Ti. Continuous lines are the linear fits to data for T > 0.4T0.