Heart Rate Reserve

Definition

Heart rate reserve (HRR) is a way of interpreting heart rate relative to your own physiology instead of treating every bpm value as if it means the same thing for everyone.

In plain language, HRR helps answer this question:

How hard is this heart rate for this specific user?

That matters because the same working heart rate can feel easy for one person and demanding for another.

Why HRR matters in TRIPS

TRIPS uses HRR-style thinking so heart-rate interpretation is tied to your own baseline anchors rather than to absolute numbers alone.

This helps the planner treat effort more personally and more realistically.

Without that kind of normalization, the same displayed heart rate could be misleading across different users.

The anchors HRR depends on

HRR interpretation only makes sense if the underlying heart-rate anchors are believable.

In practice, that means:

your resting heart rate should be realistic
your aerobic-threshold anchor should be broadly believable
your baseline walking heart-rate anchor should make sense for your normal pace

If those anchors are poor, HRR can look precise while still being wrong in practice.

Why normalized effort is useful

Absolute heart rate is still useful, but it has limits.

For example:

120 bpm may be relatively easy for one user
that same 120 bpm may be meaningfully harder for another

HRR helps TRIPS interpret that difference instead of pretending the same bpm means the same thing for everyone.

How TRIPS uses HRR conceptually

In TRIPS, HRR is most useful as an interpretation layer.

It helps the planner and related diagnostics make sense of:

where your baseline walking state sits inside your broader heart-rate range
how different effort levels relate to your physiology
whether your heart-rate anchors look broadly coherent together

The important user-facing point is not the exact math.

It is that TRIPS is trying to interpret effort in a user-relative way instead of a one-size-fits-all bpm way.

What makes HRR believable

Good HRR interpretation depends on grounded baseline inputs.

That usually means:

a believable resting heart rate
a believable aerobic-threshold estimate or measurement
a believable baseline heart rate for your normal walking anchor

If those inputs are weak, the answer is usually not to obsess over HRR.

It is to improve the anchor values first.

What HRR is not for

HRR is not something most users need to micromanage directly.

It is also not a reason to chase false physiological precision.

If you do not know your anchors especially well, a believable default is often better than a made-up value that feels more personalized.

Practical advice

For most users:

make sure your baseline heart-rate inputs are believable
let the defaults do their job unless you have better evidence
use HRR as a way to interpret effort, not as a reason to overfit the planner

If the heart-rate story in TRIPS looks strange, the first question to ask is:

Are my baseline heart-rate anchors believable?

That is usually more useful than asking whether the app's interpretation layer is too strict or too lenient.

Notes

HRR helps TRIPS interpret effort relative to the user, not just in absolute bpm.
HRR is only as believable as the heart-rate anchors underneath it.
For most users, better anchor values matter more than deeper HRR micromanagement.