Test foods and intervention
muscle soreness
The active food included fish-derived CPs (Nippi Peptide Collagenomics GFF-01; Nippi Inc.) prepared using ginger protease to ensure high absorption after ingestion [Test foods.CPs: collagen peptides.Participants consumed one bag of the test food twice, in the morning and evening for 33 days of each period, by dissolving one in approximately 100 mL of water. However, the timing in the morning of the 5-day examination after the 28th was followed on day 1, it was 1 hour before the exercise load (approximately 1 hour before muscle soreness assessment immediately after the exercise load), and on days 2–5, it was 1 hour before muscle soreness assessment.