meanPulsationPeriod_days

Given a predicate that represents a relationship or action between entities, generate a one-sentence description explaining its meaning.  
# Instructions
Focus on describing the relationship, not the entities themselves. 
# Response Format
Begin the description with \' Indicates...\'

Predicate: meanPulsationPeriod_days

Indicates the average duration, measured in days, of a repeating pulsation cycle for the entity in question.