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Mean ± SE lateral (Fx), vertical (Fy), and push/pull force (Fz) during maximum push/pull exertions for the stable and unstable handles (8 subjects’ data pooled; See Figure 2 for illustration of handle stability conditions and force directions)
| Stability | Fx (N) | Fy (N) | Fz (N) | |
|---|---|---|---|---|
| Push | Stable | −1±13 | −58±14 | −177±29 |
| Unstable | 11±4 | −4±5 | −109±14 | |
| Pull | Stable | −16±9 | 36±14 | 243±36 |
| Unstable | 0±1 | 8±3 | 195±25 |
