The upper limb of the subject, it gives the upper girdle and the load where plural differs at least to one skeletal muscle of the legs, making shaku characteristic muscle contraction do such as each one at the time of each loading, it measures the degree of muscle activity of skeletal muscle. After this, and so on upper limit of the degree of muscle activity in the territory where relationship of size of the degree of muscle activity for the size of the load in shaku characteristic muscle contracting becomes the relationship in the alignment, it decides as limiting value of the proper range of the degree of muscle activity which responds to the suffering inspection person. Degree of muscle activity of skeletal muscle of the subject in after this and while operating the equipment is measured, frequency of degree of muscle activity of the skeletal muscle in while operating the equipment, control force of the equipment in the subject on the basis of the frequency distribution which it is distributed vis-a-vis the limiting value which was calculated, is appraised.被験者の上肢、上肢帯および下肢の少なくとも1つの骨格筋に、複数の異なる負荷を与え、各負荷においてそれぞれ等尺性の筋収縮を行わせて、骨格筋の筋活性度を計測する。この後、等尺性の筋収縮における負荷の大きさに対する筋活性度の大きさの関係が線形関係になる領域における筋活性度の上限値を、被検者に応じた筋活性度の適正範囲の限界値として定める。この後、機器の操作中における被験者の骨格筋の筋活性度を計測し、機器の操作中における骨格筋の筋活性度の頻度が、求めた限界値に対して分布する頻度分布に基づいて、被験者における機器の操作力を評価する。
