The number of muscles was counted based on the muscle names corresponding to those of the human. The numbers of muscles in the musculoskeletal robots developed by (12, 51, 52) are described in the comparison.
| Number of muscles/Ratio to human | ||||||
| Human | Athlete robot* | Pneumat-BS | Anthrob† | Kenshiro | Kengoro | |
| Spine | 34 | – | 2 | – | 10 | 10 |
| Ratio (%) | 100 | – | 5.88 | – | 29.4 | 29.4 |
| Arm (without hand) | 37 | – | 3 | 9 | 10 | 19 |
| Ratio (%) | 100 | – | 8.10 | 24.3 | 27.0 | 51.4 |
| Leg (without foot) | 42 | 7 | 16 | – | 21 | 24 |
| Ratio (%) | 100 | 16.7 | 38.0 | – | 50.0 | 57.1 |
| Whole body (without hand and foot) | 106 | – | 22 | – | 40 | 52 |
| Ratio (%) | 100 | – | 20.8 | – | 37.7 | 49.1 |
| Whole body (with hand and foot) | 133 | – | 22 | – | 40 | 53 |
| Ratio (%) | 100 | – | 16.5 | – | 30.1 | 39.1 |
*Legged robot
†One-armed robot