1. Cartilage Metabolism in Endurance Athletes and Chondroprotective Action of Glucosamine
   ISAO NAGAOKA, 2019, Juntendo Medical Journal CrossRef
2. Evaluation and Validation of a Joint Stress Test to Induce Activity-Related Knee Joint Discomfort — a Prospective Case-Control Study
   Christiane Schön et al, 2021, Sports Medicine - Open CrossRef
3. Joint Health of Athletes and the Chondroprotective Action of Glucosamine
   ISAO NAGAOKA, 2017, Juntendo Medical Journal CrossRef
4. Evaluation of Chondroprotective Action of Glucosamine on Soccer and Rugby Players by Analyzing Type II Collagen Degradation and Synthesis Markers
   ISAO NAGAOKA et al, 2018, Juntendo Medical Journal CrossRef
5. Health Claims for Food Supplements and Degree of Evidence
   Juergen Bernhardt et al, 2015, Annals of Nutrition and Metabolism CrossRef
6. Evaluation of Cartilage and Bone Metabolism in Collegiate Athletes Belonging to Various Sports Clubs by Analyzing Type II Collagen Degradation and Synthesis, and Type I Collagen Degradation
   ISAO NAGAOKA et al, 2018, Juntendo Medical Journal CrossRef
7. CHONDROPROTECTIVE ACTION OF GLUCOSAMINE ON KNEE OSTEOARTHRITIS
   ISAO NAGAOKA, 2013, Juntendo Medical Journal CrossRef