Akio Morimoto is Undergraduate Student in Faculty of Sport and Health Science of Ritsumeikan University, and his research manuscript was accepted and published in The Journal of Physical Therapy Science, which collaborated with Professor Tadao Isak and Assistant Professor Tadshi Suga. The study revealed that muscle thickness in the hand was correlated with whole-body and/ appendicular skeletal muscle mass in healthy adults. Therefore, the study suggested that despite being smaller than other limb muscles, hand muscle thickness may be useful as surrogate indicator for assessing disease-related and age-related skeletal muscle loss.