Ca concentrations at the five regions along the half sarcomere at various stages of the contraction–relaxation cycle
| . | Region . | . | . | . | . | . | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| State . | Z . | I . | A1 . | A2 . | H . | N . | ||||
| Resting | 23.7±2.1 | 42.7±5.0 | 43.6±5.4 | 13.3±2.1 | 9.9±1.7 | 36 | ||||
| Contracting | 22.5±3.3 | 31.5±4.4 | 19.8±2.7** | 16.1±2.4 | 16.5±2.3* | 25 | ||||
| Time after onset of relaxation (s) | ||||||||||
| 0.1 | 34.8±4.0* | 39.8±5.6 | 29.8±4.1* | 28.8±5.2* | 35.8±5.6** | 26 | ||||
| 1.0 | 26.9±4.6 | 38.6±3.4 | 31.5±5.4 | 21.2±3.8 | 20.4±3.0* | 23 | ||||
| 3.0 | 18.1±2.7 | 47.8±4.3 | 34.4±3.1 | 10.2±1.8* | 5.8±1.3** | 31 | ||||
| 5.0 | 22.6±4.3 | 56.9±5.6 | 59.6±5.8** | 8.1±2.9 | 7.4±2.2 | 20 | ||||
| . | Region . | . | . | . | . | . | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| State . | Z . | I . | A1 . | A2 . | H . | N . | ||||
| Resting | 23.7±2.1 | 42.7±5.0 | 43.6±5.4 | 13.3±2.1 | 9.9±1.7 | 36 | ||||
| Contracting | 22.5±3.3 | 31.5±4.4 | 19.8±2.7** | 16.1±2.4 | 16.5±2.3* | 25 | ||||
| Time after onset of relaxation (s) | ||||||||||
| 0.1 | 34.8±4.0* | 39.8±5.6 | 29.8±4.1* | 28.8±5.2* | 35.8±5.6** | 26 | ||||
| 1.0 | 26.9±4.6 | 38.6±3.4 | 31.5±5.4 | 21.2±3.8 | 20.4±3.0* | 23 | ||||
| 3.0 | 18.1±2.7 | 47.8±4.3 | 34.4±3.1 | 10.2±1.8* | 5.8±1.3** | 31 | ||||
| 5.0 | 22.6±4.3 | 56.9±5.6 | 59.6±5.8** | 8.1±2.9 | 7.4±2.2 | 20 | ||||
Values are mmol kg-1 dry mass(mean±s.e.m.). Significance of the differences from the value in the previous stage are also shown;*P<0.05, **P<0.01.