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url: /docs/api/core/variables/strainSummarySchema.md
---
[**@kaiord/core**](../README.md)

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[@kaiord/core](../README.md) / strainSummarySchema

# Variable: strainSummarySchema

> `const` **strainSummarySchema**: `ZodObject`<{ `date`: `ZodISODate`; `dayAverageHeartRate`: `ZodOptional`<`ZodNumber`>; `dayMaxHeartRate`: `ZodOptional`<`ZodNumber`>; `energyKilojoules`: `ZodOptional`<`ZodNumber`>; `externalId`: `ZodOptional`<`ZodString`>; `kaiordRecordId`: `ZodOptional`<`ZodString`>; `kind`: `ZodLiteral`<`"strain"`>; `sourceBridgeId`: `ZodOptional`<`ZodString`>; `strainScore`: `ZodNumber`; `version`: `ZodString`; }, `$strip`>

Defined in: [packages/core/src/domain/schemas/health/strain.ts:14](https://github.com/pablo-albaladejo/kaiord/blob/3eacbe62ef72342d970523967cc5155b5935bb85/packages/core/src/domain/schemas/health/strain.ts#L14)

Zod schema for `extensions.health.strain` — a read-only, source-agnostic
cardiovascular-load summary (e.g. WHOOP's 0–21 strain scale plus companion
day-level heart-rate and energy figures). Unlike the six FIT-core health
types it is not mandated to round-trip through FIT.

A refinement requires `dayMaxHeartRate >= dayAverageHeartRate` when both
are present.