Activity-condition charts

The Activity-condition charts dialog displays how different conditions associated with a Multiple postures activity change over time.

Open it with the corresponding button at the bottom of the timeline. It supports temporal review of conditions affecting the analysis, such as loads, moments, seated posture, and REBA-specific settings.

No.	Area or control	Function
1	Chart selector	Selects the activity condition to represent.
2	Legend and current value	Displays the chart unit or legend and the value at the current time point.
3	Chart area	Represents how the selected condition changes over time.

Purpose of the dialog

In Multiple postures mode, an activity is defined not only by the model posture. Other analysis conditions can also change over time.

For example, the same sequence can include changes in:

whether the posture is considered seated;
the load applied at the right hand;
the load applied at the left hand;
moments applied at the hands;
loads entered on other body segments;
conditions configured for REBA;
other parameters associated with specific activity intervals.

Activity-condition charts shows when these conditions are activated, change, or disappear.

Chart selector

Control 1 selects the condition to represent.

Its contents depend on the conditions available in the activity and can include:

seated posture;
right-hand load;
left-hand load;
moments applied at the hands;
loads on other body segments;
REBA analysis conditions;
other temporal parameters associated with the activity.

Changing the selection updates the chart area with that condition’s temporal development.

Legend and current value

Area 2 displays information for the selected chart, including:

the represented variable’s legend;
its unit, such as kg, N, or N·m;
the condition value at the animation’s current time point.

The value updates when you move the timeline cursor or select a chart point.

The example image shows a right-hand load with its unit and current value.

Chart area

Area 3 shows how the selected condition changes over time.

The horizontal axis represents activity time, and the vertical axis represents the condition value. A chart can be step-shaped when a condition remains constant over an interval and changes suddenly at a particular time.

This representation is appropriate for interval-based conditions such as loads or enabled and disabled states.

Timeline synchronization

The dialog is synchronized with the timeline.

When you zoom or pan the timeline, the chart adjusts to the same temporal view. This lets you examine part of the activity in detail while preserving correspondence between the chart and posture sequence.

Selecting a point on the chart also moves the timeline cursor to that time, and the model adopts the associated posture.

This synchronization quickly locates the exact animation time at which a load appears, a condition changes, or a parameter is activated.

Select chart points

Selecting the chart positions the activity at the corresponding time.

Use this to inspect on the model the posture coinciding with a particular value.

For example, on a right-hand-load chart, select an interval where the load is active to move the animation there and review the model posture, load position, and associated results.

Display loads and moments

One of the dialog’s main uses is to review where loads and moments have been defined over the activity.

You can verify:

when a right-hand load is applied;
when a left-hand load is applied;
whether the load was assigned to the correct time;
whether a force or moment remains active longer than intended;
whether intervals incorrectly have or lack a load.

To change loads or forces, see:

Display seated posture

The dialog can also review the seated condition over time.

This is relevant because seated posture can affect support distribution, joint loads, the stabilogram, and certain biomechanical analyses.

Use the chart to check when the model is considered seated and whether this matches the represented task.

See Seated posture.

Display REBA conditions

When REBA conditions have been defined over the activity, this dialog helps identify the intervals where they are active.

Depending on the analysis configuration, these can include:

static body segments;
repetitive movements;
significant postural changes;
sudden impacts, forces, or loads;
coupling conditions;
upper-arm support or other specific conditions.

See:

Review analysis consistency

This dialog is particularly useful for verifying that entered conditions were assigned to the correct interval.

Before interpreting multiple-posture results, check that:

loads appear during the correct intervals;
forces or moments remain active for the correct duration;
REBA conditions match the actual task;
the seated condition is active only when appropriate;
no residual conditions remain applied by mistake.

Temporal results depend on the combination of posture, duration, loads, and analysis conditions.

Difference from result charts

Do not confuse Activity-condition charts with Charts.

Charts represents calculated results such as exertion, discomfort, lumbar compression, or method scores.

Activity-condition charts represents entered or configured conditions such as loads, states, or parameters affecting calculations.

They are complementary:

condition charts help verify what data were entered and when they are active;
result charts help interpret the effects of those data on calculated indicators.

Relationship with temporal analyses

Displayed conditions can affect time-dependent analyses such as:

After changing activity conditions, you may need to update analyses and result charts.

Recommended procedure

Select the condition to review.
Check when it appears and how long it remains active.
Use timeline zoom to inspect a specific interval.
Select the chart to position the model at the corresponding time.
Review the posture, loads, or conditions at that time.
Correct any condition that does not match the actual task.
Update analyses and result charts after making changes.

Relationship with the Technical foundations

For general information about temporal activity analysis, see:

These sections explain why temporal activity conditions matter when interpreting calculated results.