Cycling Training Zone Lookup

Read actual caller cycling zone intervals and measured FTP/power, retaining overlapping/no matches; no inferred Coggan edition, medical intensity prescription or HRR alias.

Description

Cycling power-zone intervals scale from measured functional threshold power (FTP).

Cycling power-zone intervals scale from measured functional threshold power (FTP). Overlap and absence of matching zones remain visible.^[1]

The returned values include Caller zone ranges watts, Compatible caller zone ids. The How section below explains the calculation, input rules and interpretation.

When to use Cycling Training Zone Lookup

Use Cycling Training Zone Lookup when you need to evaluate the supplied records under the calculation and evidence rules below. No default Coggan edition, HR-reserve calculation or exercise prescription is supplied.

Prepare the observed race, match or training records and the stated units. Supply independently verified rule editions, calibration tables and targets where requested.

How to use Cycling Training Zone Lookup and understand its results

Prepare the observed race, match or training records and the stated units. Supply independently verified rule editions, calibration tables and targets where requested.
Enter callerZoneIds, callerMinimumFtpFractions, callerMaximumFtpFractions, independentlyMeasuredFtpWatts, observedWatts using the field table and calculation rules, then run the tool.
Read callerZoneRangesWatts, compatibleCallerZoneIds. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
callerZoneIds	Caller zone ids	list of string	Required
callerMinimumFtpFractions	Caller minimum ftp fractions	list of number	Required
callerMaximumFtpFractions	Caller maximum ftp fractions	list of number	Required
independentlyMeasuredFtpWatts	Independently measured ftp watts	number	Required
observedWatts	Observed watts	number	Required

Enter aligned nonempty unique IDs/nonnegative ordered min/max FTP fractions, positive measured FTP and nonnegative observed watts. Return watt intervals and all inclusive matching IDs.

zoneWatts=FTP×fractionBounds

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
callerZoneRangesWatts	Caller zone ranges watts	list of list of number
compatibleCallerZoneIds	Compatible caller zone ids	list of string

json

{
  "input": {
    "callerZoneIds": [
      "a",
      "b"
    ],
    "callerMinimumFtpFractions": [
      0,
      0.8
    ],
    "callerMaximumFtpFractions": [
      0.7,
      1
    ],
    "independentlyMeasuredFtpWatts": 200,
    "observedWatts": 150
  },
  "output": {
    "callerZoneRangesWatts": [
      [
        0,
        140
      ],
      [
        160,
        200
      ]
    ],
    "compatibleCallerZoneIds": []
  }
}

Limitations and assumptions

No default Coggan edition, HR-reserve calculation or exercise prescription is supplied.

Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Numeric lists are limited to 10,000 entries; string lists to 128 strings of at most 128 characters each. The rules above may impose smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Coggan IF/TSS Normalized Power Calculator: Normalized Power weights rolling power to the fourth power. Intensity Factor and TSS then compare that result with measured FTP and represented duration. For a complementary task, use FTP Test Calculator: FTP estimates from different test protocols depend on conversion assumptions. Protocol results can differ despite the same athlete.

References

Cycling Training Zone Lookup — tool.io

Similar or alternative tools

Coggan IF/TSS Normalized Power Calculator
Normalized Power weights rolling power to the fourth power. Intensity Factor and TSS then compare that result with measured FTP and represented duration.
FTP Test Calculator
FTP estimates from different test protocols depend on conversion assumptions. Protocol results can differ despite the same athlete.