title: An analysis of sit-to-stand movements.
abstract: We analyzed the movements involved in rising from a knee-high chair in 12 healthy men weighing within +/- 10% of standard body weight. A regular series of transition points was observed in the angles of the hip, knee, and ankle joints throughout the sit-to-stand movement, which was classified into six stages. As the duration of sit-to-stand movements increased, the duration of Stage 2 decreased, whereas Stage 3 grew longer. The durations of stages 4 and 5 remained constant. We also calculated the minimum unilateral hip and knee extension torque per weight in kilograms required for natural sit-to-stand movements, or N-Stand (1.7-2.3 seconds), and found that minimum hip extension torque was 0.7Nm and minimum knee extension torque was 0.9Nm. The minimum hip and knee extension torque required for N-Stand corresponds to a mean 27% and 30%, respectively, of the actual maximum hip and knee extension torque.
authors.affiliation: Department of Rehabilitation Medicine, Fujita Health University, Nanakuri Sanatorium, Mie-ken, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kotake
authors.forename: N
authors.initials: N
authors.lastname: Dohi
authors.forename: T
authors.initials: T
authors.lastname: Kajiwara
authors.forename: N
authors.initials: N
authors.lastname: Sumi
authors.forename: Y
authors.initials: Y
authors.lastname: Koyama
authors.forename: T
authors.initials: T
authors.lastname: Miura
mesh_terms: D000328:Adult; D000843:Ankle Joint / Q000502:physiology; D001696:Biomechanical Phenomena; D006621:Hip Joint / Q000502:physiology*; D006801:Humans; D007719:Knee Joint / Q000502:physiology*; D007866:Leg / Q000502:physiology*; D008297:Male; D009068:Movement / Q000502:physiology; D009132:Muscles / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D016474:Weight-Bearing