Base Metabolic Rate (BMR)

Definition

In TRIPS, BMR is your baseline daily energy estimate.

In plain language, it represents the energy your body uses in the background before adding the extra demands of hiking movement.

So BMR is not:

• your hiking energy cost
• your route calorie total
• your food plan by itself

It is the background daily energy layer underneath active trip energy demands.

Why BMR matters

BMR matters because route and day calorie interpretation are more believable when the planner has a reasonable baseline daily energy assumption.

If BMR is unrealistically low, total daily energy needs can look too forgiving.

If it is unrealistically high, the trip can look more demanding than it should.

So while BMR is not the most exciting input in the planner, it is still worth getting roughly right.

The default

TRIPS gives users a derived BMR default instead of forcing everyone to enter a custom value.

That default is based on body-size assumptions, including body composition.

The important user-facing point is:

• the default is a practical estimate
• not a personal metabolic lab result

That is why the default should be treated as a starting point, not as proof.

Why body weight and body fat matter here

The BMR default is influenced by:

• body weight
• body fat estimate

That is sensible because background daily energy needs do not depend only on scale weight.

If those inputs are unrealistic, the derived BMR can also become unrealistic.

So when the default BMR looks strange, the first question is often:

Are my body weight and body fat inputs believable?

What BMR is not for

BMR should not be used as:

• a fitness badge
• a route-output tuning knob
• a substitute for active hiking energy

If route calorie totals look off, the explanation may involve:

• trip duration
• hiking time
• load
• food assumptions
• active movement cost

not just BMR.

What makes a good BMR value

For many users, the default is the right starting point.

Good reasons to override it:

• you have a more trustworthy personal estimate
• the derived default is clearly implausible for your body
• you have better evidence than the planner default

Weak reasons to override it:

• trying to make route calorie totals look nicer
• using BMR as a proxy for fitness
• guessing because a round number feels cleaner

Relationship to the rest of the planner

BMR works best when it is consistent with your baseline body inputs and the rest of the planner's assumptions.

It is most helpful to think of it as:

• background daily energy

while other parts of TRIPS deal more directly with:

• movement cost
• hiking pace
• route strain
• trip duration

That is why BMR matters without needing to do every job in the model.

Default versus manual override

For most users:

• leave BMR on the default
• make sure body weight is realistic
• use a plausible body-fat estimate rather than pretending to know it perfectly

A manual override makes the most sense when you genuinely have better evidence.

Practical advice

The best question to ask is:

Does this BMR reasonably represent my background daily energy needs, separate from hiking movement?

If the answer is yes, it is probably good enough for planning.

Notes

• BMR is a baseline daily energy estimate.
• The default is a practical estimate, not a personal metabolic measurement.
• A believable value matters more than false precision.
• For most users, the default is safer than a casual override.