Protein Intake and Exercise-induced Muscle Damage

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.