title: Between-day reliability of a hand-held dynamometer and surface electromyography recordings during isometric submaximal contractions in different shoulder positions.
abstract: Functional shoulder assessments require the use of objective and reliable standardized outcome measures. Therefore, the aim of this study was to examine the between-day reliability of a hand-held dynamometer when measuring muscle strength during flexion, abduction, and internal and external rotation as well as surface electromyography (EMG) when measuring muscle activity from m. trapezius superior and deltoideus anterior. Twenty-four healthy subjects participated and performed four isometric contractions measured with a hand-held dynamometer and EMG. Both relative and absolute reliability were calculated based on the mean of the last three of the four repetitions. EMG amplitude was assessed calculating both absolute and normalized root-mean-square (RMS) values. The reliability of the hand-held dynamometer was high (LOA=3.2-7.6% and ICC=0.89-0.98). The absolute reliability for EMG showed similar results for absolute RMS values (LOA=20.0-68.4%) and normalized RMS values (LOA=42.4-66.5%). However, the results concerning the relative reliability showed higher ICC for absolute RMS values (ICC=0.82-0.92) compared with normalized values (ICC=0.57-0.72).The outcome measurements of this study with healthy subjects were found reliable and, therefore, have the potential to detect changes in muscle strength and muscle activity.
authors: Physical Activity and Human Performance Group, Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Aalborg University, Aalborg, Denmark; Department of Occupational and Physical Therapy, Regional Hospital Central Jutland, Viborg, Denmark.
authors: Kathrine S
authors: KS
authors: Andersen
authors: Physical Activity and Human Performance Group, Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Aalborg University, Aalborg, Denmark; Department of Occupational and Physical Therapy, Aalborg University Hospital, Aalborg, Denmark.
authors: Birgitte H
authors: BH
authors: Christensen
authors: Physical Activity and Human Performance Group, Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Aalborg University, Aalborg, Denmark.
authors: Afshin
authors: A
authors: Samani
authors: Physical Activity and Human Performance Group, Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Aalborg University, Aalborg, Denmark. Electronic address: pm@hst.aau.dk.
authors: Pascal
authors: P
authors: Madeleine
mesh_terms: D000328:Adult; D004576:Electromyography / Q000379:methods*; D005260:Female; D006225:Hand; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology*; D008297:Male; D053580:Muscle Strength; D053581:Muscle Strength Dynamometer; D018482:Muscle, Skeletal / Q000502:physiology; D010808:Physical Examination; D016059:Range of Motion, Articular; D015203:Reproducibility of Results; D012399:Rotation; D012782:Shoulder / Q000502:physiology*; D055815:Young Adult
keywords: Absolute reliability; Outcome measurements; Relative reliability; m. Deltoideus anterior; m. Trapezius superior