Summary assessment of the overall risk of bias for each trial
| Study (author, year) | Component of risk of bias | Summary risk of bias | |||||
| 1 | 2 | 3 | 4 | 5 | 6 | ||
| Messier et al, 200044 | U | U | U | U | L | U | Unclear (5) Low (1) |
| Rejeski et al, 200246 | U | U | U | L | L | U | Unclear (4) Low (2) |
| Messier et al, 200445 | L | U | U | L | L | U | Unclear (3) Low (3) |
| Focht et al, 200547 | U | U | U | L | L | U | Unclear (4) Low (2) |
| Messier et al, 20133 | L | U | U | L | L | U | Unclear (3) Low (3) |