Table 1 Minimum test duration (seconds) required to derive reliable COM-based and COP-based balance parameters for research purposes (ICC ≥ 0.75) for different sensor locations and test conditions
Parameter | Eyes | COM | COP | ||||||
|---|---|---|---|---|---|---|---|---|---|
Head | Sacrum | Sternum | Three sensor | Head | Sacrum | Sternum | Three sensor | ||
JERK | Open | ≥ 50 | ≥ 20 | ≥ 20 | ≥ 20 | – | – | – | – |
Closed | ≥ 40 | ≥ 20 | ≥ 40 | ≥ 20 | – | – | – | – | |
RMS-ACC | Open | ≥ 40 | ≥ 20 | ≥ 20 | ≥ 20 | – | – | – | – |
Closed | ≥ 20 | ≥ 20 | ≥ 40 | ≥ 20 | – | – | – | – | |
Area-CE | Open | ≥ 20 | ≥ 40 | ≥ 20 | ≥ 20 | ≥ 30 | ≥ 30 | ≥ 30 | ≥ 20 |
Closed | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 70 | ≥ 120 | ≥ 30 | ≥ 30 | |
Area-SW | Open | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 30 | ≥ 20 | ≥ 20 | ≥ 40 |
Closed | ≥ 20 | ≥ 20 | ≥ 40 | ≥ 20 | ≥ 30 | ≥ 120 | ≥ 40 | ≥ 20 | |
Anteroposterior direction | |||||||||
 RDIST | Open | ≥ 40 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 40 |
Closed | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 120 | ≥ 20 | ≥ 20 | |
 MDIST | Open | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 30 | ≥ 30 | ≥ 20 | ≥ 50 |
Closed | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 120 | ≥ 30 | ≥ 20 | |
 MVELO | Open | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 |
Closed | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 30 | ≥ 120 | ≥ 20 | ≥ 20 | |
 MFREQ | Open | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 40 |
Closed | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 120 | ≥ 20 | ≥ 20 | |
 MEDFREQ | Open | ≥ 20 | ≥ 20 | ≥ 40 | ≥ 60 | ≥ 20 | ≥ 40 | ≥ 20 | ≥ 20 |
Closed | ≥ 20 | ≥ 20 | ≥ 40 | ≥ 20 | ≥ 20 | ≥ 120 | ≥ 20 | ≥ 30 | |
 CFREQ | Open | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 40 | ≥ 30 | ≥ 60 | ≥ 40 | ≥ 40 |
Closed | ≥ 20 | ≥ 20 | ≥ 40 | ≥ 20 | ≥ 120 | ≥ 120 | ≥ 30 | ≥ 20 | |
 FREQD | Open | ≥ 40 | ≥ 20 | ≥ 40 | ≥ 40 | ≥ 20 | ≥ 30 | ≥ 30 | ≥ 50 |
Closed | ≥ 40 | ≥ 40 | ≥ 60 | ≥ 50 | ≥ 20 | ≥ 120 | ≥ 30 | ≥ 20 | |
Mediolateral direction | |||||||||
 RDIST | Open | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 40 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 70 |
Closed | ≥ 20 | ≥ 20 | ≥ 40 | ≥ 20 | ≥ 30 | ≥ 120 | ≥ 20 | ≥ 30 | |
 MDIST | Open | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 40 | ≥ 30 | ≥ 20 | ≥ 30 | ≥ 60 |
Closed | ≥ 20 | ≥ 20 | ≥ 40 | ≥ 20 | ≥ 40 | ≥ 120 | ≥ 20 | ≥ 40 | |
 MVELO | Open | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 30 |
Closed | ≥ 20 | ≥ 20 | ≥ 40 | ≥ 20 | ≥ 20 | ≥ 120 | ≥ 30 | ≥ 30 | |
 MFREQ | Open | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 30 | ≥ 40 | ≥ 70 |
Closed | ≥ 20 | ≥ 40 | ≥ 40 | ≥ 20 | ≥ 20 | ≥ 120 | ≥ 30 | ≥ 50 | |
 MEDFREQ | Open | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 30 | ≥ 60 | ≥ 30 |
Closed | ≥ 20 | ≥ 40 | ≥ 20 | ≥ 20 | ≥ 30 | ≥ 120 | ≥ 40 | ≥ 50 | |
 CFREQ | Open | ≥ 20 | ≥ 60 | ≥ 20 | ≥ 20 | ≥ 30 | ≥ 40 | ≥ 60 | ≥ 70 |
Closed | ≥ 20 | ≥ 50 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 120 | ≥ 40 | ≥ 50 | |
 FREQD | Open | ≥ 20 | ≥ 80 | ≥ 20 | ≥ 40 | ≥ 20 | ≥ 20 | ≥ 30 | ≥ 40 |
Closed | ≥ 20 | ≥ 40 | ≥ 20 | ≥ 50 | ≥ 20 | ≥ 120 | ≥ 20 | ≥ 40 | |