Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Hirono Junichi and Mukai Naoki and Takayanagi Shoji and Miyakawa Shumpei,Changes in the hardness of the gastrocnemius muscle during a Kendo training camp as determined using ultrasound real-time tissue elastography,The Journal of Physical Fitness and Sports Medicine,21868131,The Japanese Society of Physical Fitness and Sports Medicine,2016,5,3,239-245,https://cir.nii.ac.jp/crid/1390001205415615872,https://doi.org/10.7600/jpfsm.5.239