Participants
isometric muscle contraction, Muscle soreness, sprained, pain
One subject of the prior placebo food group was a drop-out because he did not visit the clinic for the 5-day examination of the first period due to back pain, and another of the prior placebo food group was excluded from the analysis set because he had sprained the left ankle just before the 5-day examination of the first period, resulting in the FAS of 19 participants and the PPS of 18 participants (Baseline characteristics of participants.The maximum knee extension force during isometric muscle contraction of both legs was measured using a leg muscle strength measuring chair. Participants performed a maximum of five sets of 40 bodyweight squats. Muscle soreness was assessed with VAS on the following day of bodyweight squats.p-value is for inter-group comparisons by Prior placebo food group: Data are presented as mean ± SD. BMI: body mass index, BP: blood pressure.