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. 2019 Sep 25;151(11):1272–1286. doi: 10.1085/jgp.201912424

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© 2019 Caremani et al.

This article is available under a Creative Commons License (Attribution 4.0 International, as described at https://creativecommons.org/licenses/by/4.0/).

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Figure 1. — Temperature dependence of the isometric force developed by the EDL muscle. (A) Relation between sarcomere length (SL) and force either at rest (open circles) or at the isometric tetanus plateau (filled circles). Temperature 29°C. The thin dashed lines join the rest and tetanus plateau values of the same record to show the SL shortening during force development. Measurements done at the ID02 beamline of the ESRF. The thick dashed line shows the force–SL relation calculated using the value of 2.2 µm for the total length of the thin filaments reported for mouse muscle (Close, 1972) and 0.16 µm for the bare zone (Linari et al., 2000). (B) Force responses to tetanic stimulation of an EDL muscle at different temperatures (color code in the inset). Time zero marks the start of the stimulation. The horizontal bars indicate the 20-ms exposure windows, with the same color code as the force traces (black for exposure at rest). (C) Temperature (T) dependence of the maximal isometric force (mean ± SEM, n = 12; six muscles).