Protein Intake and Exercise-induced Muscle Damage

serum creatine kinase (CK) levels

The goal of this clinical trial is to test the effect of different protein-enhancement
 strategies versus carbohydrate control on exercise-induced muscle damage in physically active
 older adults. The main question it aims to answer is:
 
 What is the effect of three different protein-enhancement strategies (whey protein (WP),
 mixed plant-based protein (MPP), and use of protein-rich food products (PFP) on
 exercise-induced muscle damage in older adults compared to isocaloric carbohydrate control?
 
 Participants will:
 
 - Use a protein-enhancement strategy (WP, MPP or PFP) or carbohydrate control for a total
 of 5 weeks;
 
 - Participate in a single walking bound (30/40/50 km) two weeks after the start of the
 study;
 
 - Participate in a consecutive walking bound (4 days of 30/40/50 km) in the last week of
 the study period;
 
 - Complete different questionnaires and give blood samples to test for muscle damage.