title: Differences in counter-movement jump between boys with and without intellectual disability.
abstract: The purpose of this study was to describe the performance and biomechanical parameters of the counter-movement jump for young people with ID, in comparison with age matched individuals without ID. Volunteers with ID (n=13; age=15.3 ± 1.6 years; Wisk III intelligence quotient 55.6 ± 11.2) and without ID (n=13; age=15.4 ± 1.2 years) performed maximal counter-movement jumps, while knee kinematics, vertical ground reaction forces and electromyographic activity of the vastus lateralis and biceps femoris were captured. Individuals without ID jumped higher than their counterparts with ID and had lower take-off velocity, lower knee joint power and stiffness, lower knee joint extension angle and angular velocity, longer braking and propulsion phase, lower agonist and higher antagonist EMG activity. These results give an insight on possible causes for the performance deficit in CMJ in persons with ID and give the potential for such individuals to improve their ability to jump higher and more efficiently.
authors.affiliation: Laboratory of Coaching and Sport Performance, Department of Physical Education and Sport Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece.
authors.forename: Anthi
authors.initials: A
authors.lastname: Hassani
authors.affiliation: Department of Physiotherapy, Faculty of Health and Human Sciences, Akmi Metropolitan College, Thessaloniki, Greece.
authors.forename: Mariana C
authors.initials: MC
authors.lastname: Kotzamanidou
authors.affiliation: Laboratory of Coaching and Sport Performance, Department of Physical Education and Sport Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece.
authors.forename: Vassilios
authors.initials: V
authors.lastname: Tsimaras
authors.affiliation: Laboratory of Coaching and Sport Performance, Department of Physical Education and Sport Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece.
authors.forename: Savvas
authors.initials: S
authors.lastname: Lazaridis
authors.affiliation: Laboratory of Coaching and Sport Performance, Department of Physical Education and Sport Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece.
authors.forename: Christos
authors.initials: C
authors.lastname: Kotzamanidis
authors.affiliation: Department of Physical Education and Sport Science, Aristotle University of Thessaloniki, Serres, Greece. Electronic address: dpatikas@auth.gr.
authors.forename: Dimitrios
authors.initials: D
authors.lastname: Patikas
mesh_terms: D000293:Adolescent; D000367:Age Factors; D001696:Biomechanical Phenomena / Q000502:physiology; D004576:Electromyography; D006801:Humans; D008607:Intellectual Disability / Q000175:diagnosis* / Q000503:physiopathology / Q000628:therapy; D007360:Intelligence; D008297:Male; D019957:Motor Skills Disorders / Q000175:diagnosis* / Q000503:physiopathology / Q000628:therapy; D009119:Muscle Contraction / Q000502:physiology*; D009126:Muscle Relaxation / Q000502:physiology; D053580:Muscle Strength / Q000502:physiology; D018482:Muscle, Skeletal / Q000503:physiopathology; D016059:Range of Motion, Articular / Q000502:physiology; D012016:Reference Values; D012737:Sex Factors
keywords: Electromyography; Intellectual disability; Kinematics; Vertical jump