PROBLEM TO BE SOLVED: To provide an exercise strength defining device capable of defining exercise strength to be loaded on a subject in order to effectively burn body fat, and to provide a fat burning rate calculation system and exercise apparatus.SOLUTION: The exercise strength defining device includes: an acetone concentration detection part 2 for detecting an acetone concentration in the exhaled air of a subject an exercise strength calculation part 3 for calculating the exercise strength applied to the subject at least at the point of time at which the acetone concentration starts to increase and an optimum exercise strength defining part 4 for defining the exercise strength calculated by the exercise strength calculation part 3, in the range of V-20(%) to V+40(%), when defining the exercise strength at the point of time at which the acetone concentration starts to increase as V(%), as the optimum exercise strength to be applied to the subject.COPYRIGHT: (C)2011,JPO&INPIT【課題】効果的に体脂肪を燃焼させるために被験者に対して負荷すべき運動強度を規定し得る運動強度規定装置、脂肪燃焼率算出システムおよび運動器具を提供する。【解決手段】被験者の呼気中のアセトン濃度を検出するアセトン濃度検出部2と、少なくとも上記アセトン濃度が上昇し始める時点において、上記被験者に対して加えられている運動強度を算出する運動強度算出部3と、運動強度算出部3によって算出された、アセトン濃度が上昇し始める時点における運動強度をV(%)とした場合、V-20(%)~V+40(%)の範囲にある運動強度を、被験者に対して加える最適運動強度として規定する最適運動強度規定部4と、を備える。【選択図】図1
