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①BMI値
太っているかどうかの判断基準の一つが、BMI(Body Mass Index)です。
人間の肥満度を表す体格指数で、体重÷身長(m)の二乗で計算される数値(BMI値)で判定します。
日本人の体格を考慮した日本肥満学会の基準では、18.5~25未満が標準値で、25以上が肥満とされます。
統計的にもっとも病気にかかりにくい数値が「22」と言われている為、健康的な標準体重はBMI値が22になる体重とされています。
女性の場合、男性に比べ筋肉量が少ない為、「22」だとややぽっちゃりした印象を受けることもあります。
健康的な範囲で理想体重を目指すなら、BMI値「20」前後を目安にするのも一つの方法です。
18.5未満になるとやせ過ぎなので気をつけて下さい。
■BMI値(体格指数)の計算方法
÷ ( × ) =
■BMIの判定基準
・健康的なBMIの数値は「22」
②体脂肪率
BMI値とともに肥満の判断方法にしたいのが「体脂肪率」です。
BMIで肥満と判定された人は、体脂肪も多いことが推測されますが、実は、見た目が普通体型で、BMI値も標準値なのに体脂肪率が高い人もいるのです。
これは、「隠れ肥満」と呼ばれるタイプで、筋肉量が少なく、体脂肪率が多いのが特徴です。
体脂肪は筋肉よりも軽い為、例え体重が標準値でも、体脂肪が標準よりも多いことがあるのです。
体脂肪率には、BMIのように明確な指標はありませんが、日本の成人女性の場合、25%前後が標準で、30%以上からは肥満と判断されます。
■体脂肪率判定の目安
・Lohman(1986)及び長嶺(1972)によって提唱されている肥満判定の値を参考にしています。
■BMIと体脂肪率で推測できる体質タイプ
・「隠れ肥満」、「肥満」の人は、食生活の見直しと運動によるダイエットをしていきましょう。
・「やせ過ぎ」の人は、筋肉と脂肪を適度につけていく必要があります。
65
体重
kg
身長
m
BMI値
21.224491.751.75
身長
m
40
以上
やせ 標準
肥満
(1度)
肥満
(2度)
肥満
(3度)
肥満
(4度)
25~
30未満
30~
35未満
35~
40未満
18.5
未満
18.5~
25未満
男性
5~10%
未満
10~20%
未満
20~25%
未満
25%
以上
女性
5~20%
未満
20~30%
未満
30~35%
未満
35%
以上
判定 低い 標準 やや高い 高い
やせ
標準
肥満
B
M
I
体脂肪率 標準 やや高い 高い
がっちり筋肉質 肥満
隠れ肥満
やせ型
筋肉質 健康標準
低い
やせ過ぎ

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