title: A Maximum Muscle Strength Prediction Formula Using Theoretical Grade 3 Muscle Strength Value in Daniels et al.'s Manual Muscle Test, in Consideration of Age: An Investigation of Hip and Knee Joint Flexion and Extension.
abstract: This study attempted to develop a formula for predicting maximum muscle strength value for young, middle-aged, and elderly adults using theoretical Grade 3 muscle strength value (moment fair:Mf)-the static muscular moment to support a limb segment against gravity-from the manual muscle test by Daniels et al. A total of 130 healthy Japanese individuals divided by age group performed isometric muscle contractions at maximum effort for various movements of hip joint flexion and extension and knee joint flexion and extension, and the accompanying resisting force was measured and maximum muscle strength value (moment max,Mm) was calculated. Body weight and limb segment length (thigh and lower leg length) were measured, andMfwas calculated using anthropometric measures and theoretical calculation. There was a linear correlation betweenMfandMmin each of the four movement types in all groups, excepting knee flexion in elderly. However, the formula for predicting maximum muscle strength was not sufficiently compatible in middle-aged and elderly adults, suggesting that the formula obtained in this study is applicable in young adults only.
authors.affiliation: Division of Physical Therapy, Faculty of Health Sciences, Tokyo Metropolitan University, 7-2-10 Higashi-ogu, Arakawa-ku, Tokyo 116-8551, Japan.
authors.forename: Hideyuki
authors.identifier: 0000-0002-7918-0985
authors.initials: H
authors.lastname: Usa
authors.affiliation: Department of Physical Therapy, Faculty of Health Sciences, Kyorin University, 5-4-1 Shimorenjaku, Mitaka-shi, Tokyo 181-8612, Japan.
authors.forename: Masashi
authors.initials: M
authors.lastname: Matsumura
authors.affiliation: Department of Physical Therapy, Graduate School of Human Health Sciences, Tokyo Metropolitan University, 7-2-10 Higashi-ogu, Arakawa-ku, Tokyo 116-8551, Japan.
authors.forename: Kazuna
authors.initials: K
authors.lastname: Ichikawa
authors.affiliation: Department of Physical Therapy, Graduate School of Human Health Sciences, Tokyo Metropolitan University, 7-2-10 Higashi-ogu, Arakawa-ku, Tokyo 116-8551, Japan.
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Takei