Summary of the percentage of times SA occurred, and F0, FSA, FSA/F0, FSA/(F0 + FSA), and t3 percent changes under Fatigued conditions compared with Active conditions in MHC I, IIA, IIX, and IIB single muscle fibers
| MHC (#) | SA occurred | F0 | FSA | FSA/F0 | FSA/(F0 + FSA) | t3 | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Active | High | Low | ∆High | ∆Low | ∆High | ∆Low | ∆High | ∆Low | ∆High | ∆Low | ∆High | ∆Low | |
| I (14) | 100% | 0% | 0% | −27% | −43% | -- | -- | -- | -- | -- | -- | -- | -- |
| IIA (32) | 100% | 94% | 25% | −30% | −45% | 46% | 18% | 129% | 142% | 95% | 114% | −25% | −14% |
| IIX (11) | 100% | 100% | 100% | −31% | −56% | 28% | 7% | 88% | 148% | 71% | 110% | 27% | 22% |
| IIB (19) | 100% | 100% | 100% | −31% | −67% | 16% | −33% | 76% | 124% | 58% | 91% | −2% | 23% |
| MHC (#) | SA occurred | F0 | FSA | FSA/F0 | FSA/(F0 + FSA) | t3 | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Active | High | Low | |||||||||||
| I (14) | 100% | -- | -- | -- | -- | -- | -- | -- | -- | ||||
| IIA (32) | 100% | 94% | 18% | −14% | |||||||||
| IIX (11) | 100% | 100% | 100% | 28% | 7% | 27% | 22% | ||||||
| IIB (19) | 100% | 100% | 100% | 16% | −2% | ||||||||
Values are presented as percentages (%). # = number of fibers examined; High = High [Ca2+] Fatigue; Low = Low [Ca2+] Fatigue; ∆High = (High [Ca2+] Fatigue – Active)/Active; ∆Low = (Low [Ca2+] Fatigue – Active)/Active. Bold indicates P < 0.05 compared with Active.
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