Exercise load
BENDING
On the screening test day, approximately 30 min after ingesting one salted rice ball as the prescribed meal, participants performed bodyweight squats. Instructors guided to perform bodyweight squats as follows: (1) with feet shoulder-width apart; (2) standing with hands crossed in front of the chest; (3) lowering the upper body until the knees were at 90 degrees without bending forward, followed by raising the body; (4) 40 squats of lowering the upper body in 2 seconds followed by raising the body in 2 seconds for 1 set; (5) with a 20-second rest between sets for a maximum of 5 sets. If a subject had difficulty performing the bodyweight squats or continued them in a disordered rhythm, the squats were stopped.On day 1 of the 5-day examination, participants performed bodyweight squats in the same set number and the same manner as on the screening test day (Schedule of the examinations. Before: before the exercise load, Just after: just after the exercise load, 2 hrs after: 2 hours after execise load.