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Fiber diameter, Po, and Po/CSA of vastus lateralis MHC I and IIa muscle fibers before and after progressive resistance training
| Fiber Type |
Diameter, μm |
Po, mN
|
Po/CSA, kN/m
|
|||
|---|---|---|---|---|---|---|
| Pre | Post | Pre | Post | Pre | Post | |
| MHC I | 93±6 | 88±8 | 0.71±0.09 | 0.64±0.08 | 102±4 | 106±6 |
| MHC IIa | 84±6 | 85±7 | 0.88±0.15 | 0.87±0.16 | 154±10 | 148±6 |
Values are expressed as means ± SE. Po, peak isometric force; Po/CSA, peak isometric force per fiber cross-sectional area; MHC, myosin heavy chain.
