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The mean (± SD) of the first dorsal interosseous pennation angles calculated at optimal, maximum and minimum fascicle lengths for 18 muscles.
| Muscle head | Pennation angle at Lfopt (degrees) | Pennation angle at Lfmax (degrees) | Pennation angle at Lfmin (degrees) | Mean range of Pennation angle (degrees) |
|---|---|---|---|---|
| First metacarpal | 10.0 ± 5.0 | 6.6 ± 3.3 | 20.8 ± 11.8 | 14.9 ± 8.5 |
| Second metacarpal | 11.7 ± 7.6 | 7.7 ± 4.9 | 21.4 ± 11.9 | 14.6 ± 8.3 |
