著者名,論文名,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI) Shigeru Obara and Tetsuya Niki and Masayuki Satake,The first heart sound amplitude has a breaking point and positive relationships with blood lactate concentration and double product in graded exercise,Advances in exercise and sports physiology,13403141,Tsukuba : Japan Society of Exercise and Sports Physiology,2005-04,11,1,33-39,https://cir.nii.ac.jp/crid/1520290884910099072,