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isometric neck

Katherine Lee, James Onate, Samar McCann, Tamerah Hunt, Wilbert Turner, Mark Merrick
Clinical Scenario: In wrestling, athletes often support a large amount of weight on their heads or are forced into extreme ranges of motion. These suboptimal movement conditions lead to a high prevalence of neck injuries in wrestlers. A large portion of the work done by the cervical musculature in wrestling is theorized to be eccentric or isometric types of contractions. Strengthening of these cervical muscles is clinically considered to play a vital role in being competitive on the wrestling mat. The cervical stability provided by strengthening these muscles may also play a part in injury prevention among wrestlers...
August 24, 2016: Journal of Sport Rehabilitation
Qiu-ping Fan, Bo Wang, Wei-ping Ji
As an important indicator of total hip arthroplasty (THA) the rate and degree of offset reconstruction play an important role in improving the prognosis and life quality of patients. The reconstruction of femoral offset is closely related to reserved length of calcar femorale, the head and neck length of prosthesis, angle degree of neck shaft and whether lower limb is isometric. Reconstruction strategy includes making a meticulous and standard measurement before the surgery, predicting the reserved length of calcar femorale, selecting a prosthesis with approximate anatomical neck-shaft angle and reconstructing offset by adjusting the head and neck length of the prosthetic during the operation...
February 2016: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
Fateme Bokaee, Asghar Rezasoltani, Farideh Dehghan Manshadi, Sedigheh Sadat Naimi, Alireza Akbarzadeh Baghban, Hadi Azimi
OBJECTIVE: The stability of the craniocervical (CC) area is provided by CC muscles. Muscle imbalance between forces of these muscles may lead to forward head posture (FHP). FHP is one of the most prevalent abnormal postures in patients with neck pain. The aim of the present study was to compare isometric force of the CC flexor and extensor muscles between women with and without FHP. METHOD: Isometric force of the CC flexor and extensor muscles was measured by a custom-made device and compared between 70 women with and without FHP (35 in each group)...
September 2016: Cranio: the Journal of Craniomandibular Practice
Mahmut Alpayci, Emre Şenköy, Veysel Delen, Volkan Şah, Levent Yazmalar, Metin Erden, Murat Toprak, Şeyhmus Kaplan
BACKGROUND: The loss of cervical lordosis is associated with some negative clinical outcomes. No previous study has examined cervical muscle strength, specifically in patients with the loss of cervical lordosis. This study aims to investigate whether there is weakness of the cervical muscles or an imbalance between cervical flexor and extensor muscle strength in patients with the loss of cervical lordosis compared with healthy controls matched by age, gender, body mass index (BMI), and employment status...
March 2016: Clinical Biomechanics
Chih-Hsiu Cheng, Andy Chien, Wei-Li Hsu, Carl Pai-Chu Chen, Hsin-Yi Kathy Cheng
Cervical spinal loads are predominately influenced by activities of cervical muscles. However, the coordination between deep and superficial muscles and their influence on the spinal loads is not well understood. This study aims to document the changes of cervical spinal loads and the differential contributions of superficial and deep muscles with varying head postures. Electromyography (EMG) of cervical muscles from seventeen healthy adults were measured during maximal isometric exertions for lateral flexion (at 10°, 20° and terminal position) as well as flexion/extension (at 10°, 20°, 30°, and terminal position) neck postures...
2016: PloS One
Ellen Aartun, Jan Hartvigsen, Lise Hestbaek
OBJECTIVE: The overall aim of this study was to determine the ability of 2 selected clinical tests to detect or predict neck pain, mid back pain, and low back pain in a school-based cohort of Danish 11- to 15-year-olds. METHODS: A school-based 2-year prospective cohort study was conducted. Data were collected at the age of 11 to 13 (n = 1224) and 2 years later (n = 963). Spinal pain (neck pain, mid back pain, and low back pain) was assessed by an electronic survey completed during school time, and reference standard was defined as both lifetime prevalence and frequent pain as a proxy of severity...
February 2016: Journal of Manipulative and Physiological Therapeutics
Oke A Anakwenze, Krishn Khanna, William N Levine, Christopher S Ahmad
We conducted a study to determine precise ulnar tunnel location during lateral ulnar collateral ligament reconstruction to maximize bony bridge and graft construct perpendicularity. Three-dimensional computer models of 15 adult elbows were constructed. These elbow models were manipulated for simulated 4-mm tunnel drilling. The proximal ulna tunnels were placed at the radial head-neck junction and sequentially 0, 5, and 10 mm posterior to the supinator crest. The bony bridges created by these tunnels were measured...
February 2016: American Journal of Orthopedics
Con Hrysomallis
The neck musculature has an essential role in positioning and stabilising the head and may influence sport performance and injury risk. The objectives of this review are to (1) compare the neck strength of different athletes; (2) report on the outcomes of training programmes; (3) explore the association between neck strength and head stabilisation; (4) examine the relationship between neck strength and sport injury risk; and (5) identify areas for future research. There was a difference in strength between different player positions in football codes, gender and age...
August 2016: Sports Medicine
Sirpa Mustalampi, Jari Ylinen, Katariina Korniloff, Adam Weir, Arja Häkkinen
OBJECTIVE: To evaluate changes in the strength and mechanical properties of neck muscles and disability in patients with cervical dystonia (CD) during a 12-week period following botulinum neurotoxin (BoNT) injections. METHODS: Eight patients with CD volunteered for this prospective clinical cohort study. Patients had received BoNT injections regularly in neck muscles at three-month intervals for several years. Maximal isometric neck strength was measured by a dynamometer, and the mechanical properties of the splenius capitis were evaluated using two myotonometers...
January 2016: Journal of Movement Disorders
Noureddin Karimi, Asghar Rezasoltani, Leila Rahnama, Farhang Noori-Kochi, Shapour Jaberzadeh
BACKGROUND: Altered pattern of muscle activity is commonly seen with chronic neck pain (CNP). However, limited investigations have been done on dorsal neck muscles' activity pattern while performing upper limb tasks in patients with CNP. OBJECTIVES: To investigate dorsal neck muscles' thickness changes during isometric contraction of shoulder muscles. DESIGN: Case-control study. METHODS: This study investigated dorsal neck muscles' thickness changes during isometric contraction of shoulder muscles in 20 healthy participants (mean age 27 ± 4...
April 2016: Manual Therapy
H C Almstedt, S Grote, S E Perez, T C Shoepe, S L Strand, H P Tarleton
Cancer survivors often experience poor post-treatment musculoskeletal health. This study examined the feasibility of combined aerobic and resistant training (CART) for improving strength, skeletal health and balance. Cancer survivors (n = 24) were identified by convenience sampling in Los Angeles County with 11 survivors consenting to 13 weeks of CART. Pre- and post-intervention assessments of bone mineral density (BMD), strength, flexibility and biomarker analysis were performed. Paired t-test analysis suggested increases in lower and upper body strength...
January 18, 2016: European Journal of Cancer Care
Birgit Castelein, Barbara Cagnie, Thierry Parlevliet, Ann Cools
BACKGROUND: The Serratus Anterior (SA) has a critical role in stabilizing the scapula against the thorax. Research has linked shoulder and neck disorders to impairments in the SA activation. Exercises that target the SA are included in the rehabilitation of shoulder or neck pain and mostly include a protraction component. The Pectoralis Minor (PM) functions as a synergist of the SA. From the literature it is unclear to what extent PM is activated during SA exercises. OBJECTIVES: To determine the activity of SA and PM during different protraction exercises...
April 2016: Manual Therapy
Aler D Fuentes, Conchita Martin, Ricardo Bull, Hugo Santander, Mario F Gutiérrez, Rodolfo Miralles
OBJECTIVES: There is scarce knowledge regarding the influence of a natural mediotrusive contact on mandibular and cervical muscular activity. The purpose of this study was to analyze the EMG activity of the anterior temporalis (AT) and sternocleidomastoid (SCM) muscles during awake grinding in healthy subjects with or without a natural mediotrusive occlusal contact. METHOD: 15 subjects with natural mediotrusive occlusal contact (Group 1) and 15 subjects without natural mediotrusive occlusal contact (Group 2) participated...
December 29, 2015: Cranio: the Journal of Craniomandibular Practice
Alain Hamaoui, Myriam Hassaïne, Bruno Watier, Pier-Giorgio Zanone
The purpose of this study was to assess the effect of table and seat slope on the biomechanical stress sustained by the musculo-skeletal system. Angular position of the head and trunk, and surface electromyography of eleven postural muscles were recorded while seated under different conditions of seat slope (0°, 15° forward) and table slope (0°, 20° backward). The specific stress sustained by C7-T1 joint was estimated with isometric torque calculation. The results showed that the backward sloping table was associated with a reduction of neck flexion and neck extensors EMG, contrasting with a concurrent overactivity of the deltoideus...
January 2016: Gait & Posture
Teresa Hughes, Christopher R Watts
OBJECTIVE: To compare the electrophysiological activity in submandibular hyolaryngeal muscles during performance of 2 exercises that incorporate resistance against muscular contraction. DESIGN: Within-subject repeated-measures design. SETTING: Academic research laboratory. PARTICIPANTS: Healthy, young adult women (N=26; mean age, 24.1y) without a history of dysphagia, cervical spine conditions, neurologic disease, or head/neck cancer...
September 2016: Archives of Physical Medicine and Rehabilitation
Daniel Jirak, Jiri Janacek, Benjamin P Kear
Brain size is widely used as a measure of behavioural complexity and sensory-locomotive capacity in avians but has largely relied upon laborious dissections, endoneurocranial tissue displacement, and physical measurement to derive comparative volumes. As an alternative, we present a new precise calculation method based upon coupled magnetic resonance (MR) imaging and computed tomography (CT). Our approach utilizes a novel interactive Fakir probe cross-referenced with an automated CT protocol to efficiently generate total volumes and surface areas of the brain tissue and endoneurocranial space, as well as the discrete cephalic compartments...
2015: Scientific Reports
Ming Ma, Shi-min Zhang
Biomechanical evaluation of neck muscles has important significance in the diagnosis and treatment for cervical spondylosis, the neck muscle strength and soft tissue stiffness test is two aspects of biomechanical testing. Isometric muscle testing operation is relatively simple, the cost is lower, which can evaluate the muscle force below grade 3. However, isokinetic muscle strength testing can assess the muscle strength of joint motion in any position. It is hard to distinguish stiffness difference in different soft tissues when the load-displacement curve is used to evaluate the local soft tissue stiffness...
August 2015: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
Andréia Cristina de Oliveira Silva, Daniela Aparecida Biasotto-Gonzalez, Douglas Meira Dos Santos, Nivea Cristina De Melo, Cid André Fidelis de Paula Gomes, César Ferreira Amorim, Fabiano Politti
Background. The aim of the present study was to assess the immediate effects of auricular acupuncture (AA) on the electromyographic (EMG) activity of the upper trapezius muscle and pain in nonspecific neck pain (NS-NP) patients. Twelve patients with NS-NP (NS-NP group) and 12 healthy subjects (HS Group) were enrolled in a randomized, single-blinded, crossover study. Each subject received a single session of AA and sham AA (SAA). Surface EMG activity was measured in the upper trapezius muscle at different "step contractions" of isometric shoulder elevation (15%, 20%, 25%, and 30% MVC)...
2015: Evidence-based Complementary and Alternative Medicine: ECAM
Leila Rahnama, Asghar Rezasoltani, Minoo Khalkhali-Zavieh, Behnam Rahnama, Farhang Noori-Kochi
OBJECTIVES: This study was conducted with the purpose of evaluating the inter-session reliability of new software to measure the diameters of the cervical multifidus muscle (CMM), both at rest and during isometric contractions of the shoulder abductors in subjects with neck pain and in healthy individuals. METHOD: In the present study, the reliability of measuring the diameters of the CMM with the Sonosynch software was evaluated by using 24 participants, including 12 subjects with chronic neck pain and 12 healthy individuals...
July 2015: Brazilian Journal of Physical Therapy
Ramesh Swaminathan, Jonathan M Williams, Michael D Jones, Peter S Theobald
BACKGROUND: The relationship between muscular force and electromyography (EMG) has been investigated by numerous researchers. EMG has not previously been used as a means of estimating force in the cervical erector spinae (CES). OBJECTIVE: Use EMG of the CES musculature to indirectly predict neck extension force. METHODS: Isometric contractions of the CES muscles were studied at increasing levels of contractile force across all participants (n= 12) to produce an individualised force-EMG relationship...
September 6, 2015: Journal of Back and Musculoskeletal Rehabilitation
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