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. 2019 Jan 31;151(5):645–659. doi: 10.1085/jgp.201812200

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© 2019 Robinett et al.

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Figure 7. — Effects of PKA and lambda phosphatase on SL shortening. (A) Schematic of skeletal muscle C-zone. (B) Representative force (top) and sarcomere length (bottom) during loaded shortening into the C-zone before (black) and after (green) of PKA treatment. (C and D) Summary of sarcomere length trace curvature (C) and sarcomere length shortening (D) before (black) and after (green) PKA treatment. Sarcomere length shortening was decreased following lambda phosphatase treatment (D, red). Decreased curvature and increased magnitude of sarcomere shortening implicates less deceleration and faster overall loaded shortening during force clamps (n = 5). *, P < 0.05 compared with non-PKA using paired t test analysis.