TABLE 5.
Papillary muscle function after changes in extracellular calcium concentration.
| Groups | 0.625 mM | 1.25 mM | 2.5 Mm | |
| DT (g/mm2) | W | 3.36 ± 0.82 | 5.27 ± 0.98 | 6.13 ± 1.38 |
| W-EX | 3.34 ± 0.77 | 5.14 ± 0.83 | 5.88 ± 1.10 | |
| SHR | 4.40 ± 1.27* | 6.15 ± 1.55* | 6.58 ± 1.33 | |
| SHR-EX | 5.16 ± 0.97#§ | 6.62 ± 1.26# | 6.87 ± 1.33# | |
| RT (g/mm2) | W | 0.49 ± 0.14 | 0.49 ± 0.14 | 0.49 ± 0.13 |
| W-EX | 0.46 ± 0.10 | 0.45 ± 0.09 | 0.47 ± 0.09 | |
| SHR | 0.71 ± 0.15* | 0.70 ± 0.16* | 0.72 ± 0.19* | |
| SHR-EX | 0.74 ± 0.23# | 0.75 ± 0.23# | 0.80 ± 0.25# | |
| +dT/dt (g/mm2/s) | W | 35.0 ± 9.12 | 56.7 ± 12.5 | 69.3 ± 16.9 |
| W-EX | 35.2 ± 6.42 | 55.7 ± 8.69 | 66.2 ± 14.1 | |
| SHR | 38.5 ± 10.4 | 58.5 ± 16.7 | 63.8 ± 14.6 | |
| SHR-EX | 48.8 ± 9.53#§ | 66.5 ± 12.7 | 71.9 ± 15.2 | |
| -dT/dt (g/mm2/s) | W | 15.8 ± 3.50 | 22.2 ± 3.61 | 23.4 ± 4.68 |
| W-EX | 15.1 ± 2.26 | 21.6 ± 2.42 | 22.7 ± 3.43 | |
| SHR | 20.0 ± 5.40* | 25.5 ± 5.29* | 26.0 ± 4.22 | |
| SHR-EX | 22.4 ± 3.45# | 26.2 ± 3.99# | 26.4 ± 4.05# |
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 decrease. ANOVA for a 2 × 2 factorial design and Tukey; *p < 0.05 vs. W; #p < 0.05 vs W-EX; §p < 0.05 vs. SHR.