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. 2005 Mar;125(3):257–271. doi: 10.1085/jgp.200409177

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Copyright © 2005, The Rockefeller University Press

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Figure 4. — SL dependence of the effect of PKA on passive force. Percent reduction is shown. (A) SL dependence for peak force. Data fitted to linear regression line. Left, total passive force. The slopes are −55.10 (R² = 0.98; P < 0.05), −14.56 (R² = 0.97; P < 0.01), and −6.65 (R² = 0.98; P < 0.005), for RV, BLV, and BLA, respectively. Right, titin-based passive force. The slopes are −92.20 (R² = 0.99; P < 0.05), −12.49 (R² = 0.91; P < 0.05), and −4.25 (R² = 0.94; P < 0.05), for RV, BLV, and BLA, respectively. (B) SL dependence for steady-state passive force (data obtained 30 min after stretch). Left, total passive force. The slopes are −38.61 (R² = 0.98; P < 0.01), −6.69 (R² = 0.97; P < 0.05), and −5.58 (R² = 0.89; P < 0.05), for RV, BLV, and BLA, respectively. Right, titin-based passive force. The slopes are −30.64 (R² = 0.99; P < 0.05), −5.10 (R² = 0.89; P < 0.05), and −3.29 (R² = 0.92; P < 0.05), for RV, BLV, and BLA, respectively. *, P < 0.05 compared with BLA; ^#, P < 0.05 compared with BLV. n = 6–8.