TABLE 4.
Papillary muscle function after post-resting contraction.
| Groups | PP 10 s | PP 30 s | PP 60 s | |
| DT (g/mm2) | W | 5.94 ± 1.53 | 6.60 ± 1.49 | 6.81 ± 1.52 |
| W-EX | 5.82 ± 1.12 | 6.47 ± 1.21 | 6.65 ± 1.25 | |
| SHR | 6.49 ± 1.38 | 7.05 ± 1.45 | 7.26 ± 1.48 | |
| SHR-EX | 7.30 ± 1.53# | 7.80 ± 1.53# | 7.98 ± 1.60# | |
| RT (g/mm2) | W | 0.56 ± 0.17 | 0.56 ± 0.16 | 0.55 ± 0.16 |
| W-EX | 0.52 ± 0.08 | 0.52 ± 0.11 | 0.51 ± 0.12 | |
| SHR | 0.82 ± 0.19 | 0.80 ± 0.19* | 0.77 ± 0.19* | |
| SHR-EX | 0.84 ± 0.24# | 0.85 ± 0.25# | 0.82 ± 0.23# | |
| +dT/dt (g/mm2/s) | W | 63.0 ± 18.7 | 69.7 ± 17.5 | 72.2 ± 17.5 |
| W-EX | 61.6 ± 12.6 | 69.5 ± 14.4 | 71.3 ± 14.7 | |
| SHR | 58.7 ± 14.4 | 65.0 ± 15.6 | 67.1 ± 15.5 | |
| SHR-EX | 71.6 ± 14.5 | 77.2 ± 16.5 | 78.6 ± 18.0 | |
| -dT/dt (g/mm2/s) | W | 21.5 ± 4.36 | 23.2 ± 4.47 | 23.6 ± 4.25 |
| W-EX | 21.8 ± 3.28 | 22.8 ± 3.37 | 23.3 ± 3.08 | |
| SHR | 23.8 ± 4.01 | 24.7 ± 3.96 | 25.7 ± 4.28 | |
| SHR-EX | 25.5 ± 3.60# | 26.0 ± 3.91# | 26.9 ± 4.40# |
Data as mean ± standard deviation. W, Wistar rats; W-EX, exercised Wistar rats; SHR, spontaneously hypertensive rats; SHR-EX, exercised SHR; DT, developed tension; RT, resting tension; +dT/dt, maximum rate of tension development; –dT/dt, maximum rate of tension decreases. ANOVA for a 2 × 2 factorial design and Tukey; *p < 0.05 vs. W; #p < 0.05 vs. W-EX.