title: Isometric elbow extensors strength in supine- and prone-lying positions.
abstract: The purpose of this study was to compare isometric strength of elbow extensors measured in supine- and prone-lying positions at elbow flexion angles of 45 and 90 degrees. Twenty-two male subjects under single-blind procedures participated in the study. Each subject participated in both supine-lying and prone-lying measuring protocols. Calibrated cable tensiometer was used to measure isometric strength of the right elbow extensors and a biofeedback electromyography was used to assure no substitution movements from shoulder girdle muscles. The mean values of isometric strength of elbow extensors measured from supine-lying position at elbow flexion angles of 45 and 90 degrees were 11.1  ±  4.2 kg and 13.1  ±  4.6 kg, while those measured from prone-lying position were 9.9  ±  3.6 kg and 12  ±  4.2 kg, respectively. There is statistical significant difference between the isometric strength of elbow extensors measured from supine-lying position at elbow flexion angles of 45 and 90 degrees compared to that measured from prone-lying position (p  <  0.05). The results suggest that in manual muscle testing starting position can affect the isometric strength of elbow extensors since supine-lying starting position is better than prone-lying starting position.
authors.affiliation: Department of Physical Therapy and Health Rehabilitation, College of Applied Medical Sciences, Aljouf University, Sakaka, Kingdom of Saudi Arabia.
authors.forename: Ibrahim E
authors.initials: IE
authors.lastname: Abdelzaher
authors.forename: Anas F
authors.initials: AF
authors.lastname: Ababneh
authors.forename: Jehad M
authors.initials: JM
authors.lastname: Alzyoud
mesh_terms: D004551:Elbow Joint / Q000502:physiology*; D004576:Electromyography; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology*; D008297:Male; D053580:Muscle Strength / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D056888:Patient Positioning; D016684:Prone Position / Q000502:physiology; D016059:Range of Motion, Articular / Q000502:physiology; D015203:Reproducibility of Results; D016037:Single-Blind Method; D016683:Supine Position / Q000502:physiology; D055815:Young Adult