Event detection algorithm can be set on session level, see 'Event mode'. Default event detection algorithm is set to 'Force Plates'. Other options are 'No Force Data (Automatic)' which is using kinematics data and 'Manual' where user sets events manually in QTM. When event mode is set to 'Force Plates', events are always detected from ground reaction forces. 'Manual' event mode is applied only if no GRF is found and is suitable for situations when 'No Force Data (Automatic)' mode fails to detect event correctly.
Kinematics graphs are plotted between PlotStart and PlotEnd events. Kinetics graphs are potted between PlotStartForce and PlotEndForce events. When force plates are used for event detection ON and OFF events are used to define PlotStart and Plot End. Without force plates PlotStart and PlotEnd events are based on foot proximal end velocity and approximately correspond to force based ON and OFF events.
When manual event mode is used, events must be named LON, LOFF, RON, ROFF for all tasks.
By default it is assumed that force plates exist and Event mode is set to 'Force Plates'. Automatic event detection is applied that give ON and OFF events based on foot contact to force plate.
LON/RON/LOFF/ROFF events are created based on ground reaction data. It is recommended that only first step hits a plate.
PlotStart is a first frame.
PlotEnd is a last frame.
LON/RON/LOFF/ROFF events are created based on ground reaction data. It is recommended that there is only contact with the force plate is when direction of movement occurs.
LON/RON/LOFF/ROFF events are created based on ground reaction data
TouchDown - either LON or RON or mean of LON and RON, if both events are available
TakeOff - either LOFF or ROFF or mean of LOFF and ROFF, if both events are available
Eccentric_end - calculated as peak body COM vertical velocity. COM vertical velocity calculated from vertical force using F = m*a formula.
It is assumed that only one foot contact with force plate is executed during cutting manoeuvre
TouchDown - first instance of ascending crossing of 0.1 on vertical component of ground reaction force
TakeOff - as first instance after TouchDown of descending crossing of 0.1 on vertical component of ground reaction force
Weight Acceptance (END_WA) - first minimum of vertical ground reaction force between TouchDown and TakeOff
Maximum knee flexion (Max_knee_flex) - global minimum of knee flexion between TouchDown and TakeOff
Virtual_gate_start and Virtual_gait_end - set in settings.php as the shortest distance of pelvis origin at the event to pelvis origin at foot contact with force plate.
LON/RON/LOFF/ROFF events are created based on ground reaction data.
TouchDown_L - first instance of LON
TouchDown_R - first instance of RON
TakeOff_L - first instance of LOFF
TakeOff_R - first instance of ROFF
Landing_L - second instance of LON
Landing_R - second instance of RON
TouchDown - first instance of ascending crossing of 200 on vertical force
TakeOff - first instance after TouchDown of descending crossing of 20 on vertical force
Landing - first instance after TakeOff of ascending crossing of 200 on vertical force
Eccentric_end - calculated from body COM vertical velocity. If cannot be calculated from body COM, lowest point of pelvis vertical displacement is used instead.
LON/RON/LOFF/ROFF events are created based on ground reaction data.
LON/RON/LOFF/ROFF events are created based on ground reaction data
LON/RON/LOFF/ROFF events are created based on ground reaction data.
LON/RON/LOFF/ROFF events are created based on ground reaction data.
LON/RON/LOFF/ROFF events are created based on ground reaction data
TouchDown - first instance of ascending crossing of 200 on vertical force.
PlotEnd - as defined by $SLL_duration in settings.php.
TouchDown - first instance of ascending crossing of 200 on vertical force
TakeOff - last maximum on vertical component of pelvis COG velocity before TouchDown
Weight Acceptance (END_WA) - first minimum of vertical ground reaction force between TouchDown and TakeOff
Maximum knee flexion (Max_knee_flex) - global minimum of knee flexion between TouchDown and TakeOff
The same as Single-leg Jump
PlotEnd - as defined by $SLL_duration in settings.php.
TOP - zero crossing of vertical component of pelvis COG velocity
LON/RON/LOFF/ROFF events are created based on ground reaction data.
When force plates are not available it is possible to derive events from kinematics data by setting Event mode to 'No Force Data (Automatic)'.
LON/RON - minimum on AP component of foot distal end velocity
LOFF/ROFF - maximum on vertical component of foot distal end velocity
PlotStart is a first frame.
PlotEnd is a last frame.
LON/RON - minimum on vertical component of foot distal end velocity
LOFF/ROFF - onset of ML component of foot distal end velocity after pelvis stop (change of direction)
LON/RON - global minimum of vertical component of pelvis COG velocity
LOFF/ROFF - last onset of AP component of foot distal end velocity before global maximum on same signal
TakeOff - mean of LOFF and ROFF
TouchDown - mean of LON and RON
TouchDown - last minimum on vertical component of foot distal end velocity before first minimum on AP component of the same signal
TakeOff - onset on vertical component of foot distal end velocity after first minimum on AP component of the same signal
TakeOff_L/TakeOff_R - global maximum on vertical component of foot distal end velocity
TouchDown_L/TouchDown_R - last minimum on vertical component of foot distal end velocity before TakeOff_L/TakeOff_R
Landing_L/Landing_R - first minimum on vertical component of foot distal end velocity after TakeOff_L/TakeOff_R
TakeOff - same as Takeoff_L
TouchDown - same as TouchDown_L
Landing - same as Landing_L
Using Zeni (2008) based approach
LHS/RHS - maximum on AP component of heel to pelvis distance
LTO/RTO - minimum on AP component of heel to pelvis distance
LON/RON - same as LHS/RHS
LOFF/ROFF - same as LTO/RTO
TouchDown - minimum on vertical component of foot distal end velocity
TakeOff - onset of ML component of foot distal end velocity
TouchDown - ascending zero crossing of vertical component of foot distal end velocity
TakeOff - ascending zero crossing of vertical component of foot distal end velocity
The same as Gait
LON/RON - minimum on vertical component of foot distal end velocity
LOFF/ROFF - global maximum on vertical component of foot distal end velocity between ON events
TouchDown - minimum on vertical component of foot distal end velocity
PlotEnd - as defined by $SLL_duration in settings.php.
TouchDown - global minimum on vertical component of foot distal end velocity
TakeOff - last maximum on vertical component of pelvis COG velocity before TouchDown
Maximum knee flexion (Max_knee_flex) - global minimum of knee flexion between TouchDown and TakeOff
The same as Single-leg Jump
TOP - zero crossing of vertical component of pelvis COG velocity
LON/RON - minimum on vertical component of foot distal end velocity
LOFF/ROFF - global maximum on vertical component of foot distal end velocity between ON events