How to use the ΔHR Shape tab and controls

Use this tab to inspect how the observed heart-rate response behaves across grade after the earlier calibration steps.

This is a validation-and-refinement step, not the first place to start tuning.

What this tab is for

The ΔHR Shape tab answers this question:

Does the modeled ΔHR curve still align with the observed FIT pattern across grade, or did earlier edits create a mismatch that needs correction?

Read it this way:

• read the main chart first
• check the advisor metrics second
• use controls only when both point to the same issue

If the chart and advisor already support the current fit, move on.

Step 1: Open the ΔHR Shape tab

From the Calibration Workspace, click ΔHR Shape.

This tab has two sides:

• the left side shows the observed binned ΔHR series against the modeled fit
• the right side groups the controls you can use if a mismatch is clear enough to act on

Step 2: Read the main ΔHR chart before touching the controls

Start with the chart, not the sliders.

What you are looking at:

• the green ΔHR (binned) line from observed FIT windows
• the orange dashed TRIPS ΔHR model fit

Check these first:

• does the model follow the broad U-shape in the observed bins
• is the minimum region in the right place
• is the mismatch mainly downhill, uphill, or around the trough
• are the edges of the chart data-rich enough to trust

Step 3: Use the ΔHR Shape Advisor as a quick judgment

Read the advisor after reading the chart.

Pay attention to:

• ΔHR Shape Score
• Agreement
• RMSE
• Bias
• Spearman ρ
• Bins used
• Data sufficiency

Use the advisor like this:

• if agreement is good and the chart is acceptable, do not keep tuning
• if RMSE or bias is poor, use the chart to locate the part of the curve that causes it
• if coverage is weak, avoid aggressive tuning

Step 4: Start with the controls nearest the part of the curve that is wrong

Do not change several sections at once.

Start with the part of the control panel that matches the mismatch you actually see:

• if the low point of the U-shape is misplaced, start near the top controls
• if the downhill side is wrong, use the downhill section
• if the uphill side is wrong, use the uphill section

Start near the top controls when:

• the trough is clearly misplaced
• the minimum strain is clearly too high or too low

Step 5: Use the downhill section only for downhill-specific mismatch

Use the downhill section only when the negative-grade side is the actual problem.

Typical reasons to work here:

• the downhill side starts changing too early or too late
• the downhill side is consistently too high or too low
• the downhill curve changes too abruptly or too smoothly

Step 6: Use the uphill section only for uphill-specific mismatch

Use the uphill section only when the positive-grade side is the actual problem.

Typical reasons to work here:

• the uphill rise starts in the wrong place
• the uphill side is clearly too flat or too steep
• the upper end of the curve is capped too high or too low
• the uphill transition is too sharp or too smeared out

Recommended order

Use this sequence:

1. Read the main chart.
2. Check the advisor metrics.
3. Identify whether the mismatch is centered, downhill, or uphill.
4. Change one control group at a time.
5. Recheck the chart and advisor after every change.

When not to keep tuning

Stop adjusting if:

• the advisor already says the fit is acceptable
• the curve already matches the observed bins closely enough
• you are chasing small local deviations without route-planning impact
• one fix improves one region by worsening the rest of the curve

This tab is for correcting a specific mismatch, not for forcing the model through every observed point.

What to do next

After reviewing ΔHR Shape, continue with:

• How to use the COT Shape tab and controls
• Review calibration outputs
• Apply calibration to a route