2.1. Study Design
In a randomized, parallel-group, double-blind fashion, active-duty firefighters were randomly assigned to ingest (A) whey protein isolate + carbohydrate (ProCarb Group); or (B) whey protein isolate + carbohydrate + creatine monohydrate (Creatine Group) for a 21–26-day supplementation period (the ClinicalTrials.gov Identifier is: NCT06172543). A CONSORT diagram is presented in 