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.
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serum creatine kinase (CK) levels
Timeframe: Measured 8 times in total. Once pre-single exercise, two times post-single exercise (within 2h after and around 24h after) and 2 weeks later: once pre-multiple day exercise and four times post-multiple day exercise (within 2h post-exercise)