This is the ValueSet that contains all the codes in Heart Rate Measurement Method value set (https://hl7.fr/ig/fhir/core/ValueSet/fr-core-vs-heartrate-measurement-method) and Heart Rate Measurement Method value set (https://hl7.fr/ig/fhir/core/ValueSet/fr-core-vs-heartrate-measurement-method). E.g. what you have to deal with if you get resources containing codes in either of them