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| Muscles | Ballsize | Feedback | Ballsize + feedback |
|---|---|---|---|
| Biceps brachii | 0.329 | 0.144 | 0.662 |
| Triceps brachii | 0.940 | 0.050 | 0.433 |
| Upper Trapezius | 0.424 | 0.717 | 0.727 |
| Anterior deltiod | 0.191 |
|
0.346 |
| Posterior deltoid | 0.810 |
|
0.979 |
Statistical significance: 
, and 
.
