Name: Energy Reserve – TRIMP & Training Load
Author: Andre_Cari

Energy Reserve is an advanced Garmin Connect IQ data field for cycling and running, combining Energy Reserve, Training Load (Banister TRIMP), Heart Rate Zones and Workout Intensity in a single screen.
Through an intuitive screen, it offers two complementary indicators to help you monitor workout intensity and manage your energy more effectively during the activity.

## TWO INDICATORS, A COMPLETE OVERVIEW## 

ENERGY – ENERGY RESERVE BASED ON HEART RATE ZONES
Estimates the remaining energy by analysing the time spent in the five heart rate zones, from Z1 to Z5.

- Overall remaining energy indicator, expressed as a percentage.
- Percentage and dedicated bar for each zone.
- Different consumption rates depending on the heart rate zone: higher-intensity zones have a greater weight.
- Ability to set the maximum time spent in each zone.

It is also possible to choose how many zones must reach 0% for the overall energy level to be reset to zero.

LOAD – TRIMP-BASED TRAINING LOAD
A second indicator monitors the accumulated training load during the activity using the Banister TRIMP method.

The LOAD bar starts at 100% and gradually decreases as TRIMP accumulates, reaching 0% when the set limit is reached.

The calculation uses:
- Current heart rate.
- Maximum heart rate.
- Resting heart rate.
- Sex, to select the formula parameters.

TRIMP is updated during the activity using elapsed time and heart rate.

## ALL DATA AT A GLANCE## 

The main screen simultaneously displays:
- ENERGY: overall remaining energy.
- Z1–Z5: remaining energy for each heart rate zone.
- HR: current heart rate.
- ZONE: current heart rate zone.
- TRIMP: accumulated training load.
- LOAD: remaining load as a percentage.

## COLOURS AND DISPLAY## 

The indicators use an intuitive colour scale:
- Green: above 50%.
- Yellow/orange: from 20% to 50%.
- Red: below 20%.

You can choose between a black and a white background.

The interface is designed to adapt to different Garmin displays:
- Garmin watches: full-screen display, optimised for round screens.
- Garmin Edge cycling computers: full-screen or half-screen display, depending on the data page configuration.

## CUSTOMISABLE SETTINGS## 

Parameters can be modified directly through the Garmin Connect IQ app:
- TRIMP limit: threshold at which LOAD reaches 0% (default: 175).
- Max heart rate: maximum heart rate.
- Resting heart rate: resting heart rate.
- Sex: Garmin profile, male or female.
- Background: black or white background.
- Max time Z1–Z5: maximum time in minutes for each zone (initial values: 180, 180, 60, 30 and 15 minutes).
- Energy reaches 0% when: number of zones that must reach 0% to reset the overall energy level to zero.

## REQUIREMENTS AND INSTALLATION## 

- A heart rate sensor is required, either wrist-based optical or a chest strap.
- Heart rate zones are read from the Garmin profile.
- Maximum and resting heart rate values are used for the TRIMP calculation.
- To use the data field, start an activity, open the data screen settings, add a screen or a data field, and select Energy Reserve from the Connect IQ fields.

NOTE: ENERGY and LOAD are estimation indicators designed to help manage effort during an activity. They do not represent direct physiological measurements and are not intended for medical purposes.