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225 records – page 1 of 23.

Acute biomechanical responses to a prolonged standing exposure in a simulated occupational setting.

https://arctichealth.org/en/permalink/ahliterature141293
Source
Ergonomics. 2010 Sep;53(9):1117-28
Publication Type
Article
Date
Sep-2010
Author
Erika Nelson-Wong
Samuel J Howarth
Jack P Callaghan
Author Affiliation
Regis University, Denver, Colorado, USA.
Source
Ergonomics. 2010 Sep;53(9):1117-28
Date
Sep-2010
Language
English
Publication Type
Article
Keywords
Biomechanical Phenomena - physiology
Electromyography - instrumentation - methods
Female
Humans
Low Back Pain - etiology
Male
Occupational Diseases - etiology
Ontario
Postural Balance - physiology
Posture - physiology
Time Factors
Young Adult
Abstract
Prolonged occupational standing has previously been associated with low back pain (LBP) development. The immediate effects of a bout of prolonged standing on subsequent functional movement performance have not been investigated. It is possible that including a period of prolonged standing may have acute, detrimental effects. The purpose of the study is to investigate the impact of a prolonged standing exposure on biomechanical profiles (trunk muscle activation, joint stiffness and kinematics) during three functional movements. A total of 23 volunteers without history of LBP performed lumbar flexion, single-leg stance and unloaded squat movements pre- and post 2 h of standing exposure. It was found that 40% of the participants developed LBP during the standing exposure. There was a decrease in vertebral joint rotation stiffness in lateral bending and increased centre of pressure excursion during unilateral stance following standing exposure. There may be adverse effects to prolonged standing if followed by activities requiring precise balance or resistance of side loads. STATEMENT OF RELEVANCE: Prolonged standing may result in decreases in balance reactions during narrow base conditions as well as in the capacity to effectively resist side-loads at the trunk. Consideration should be given when prolonged standing is included in the workplace.
PubMed ID
20737337 View in PubMed
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Acute fatigue impairs neuromuscular activity of anterior cruciate ligament-agonist muscles in female team handball players.

https://arctichealth.org/en/permalink/ahliterature143314
Source
Scand J Med Sci Sports. 2011 Dec;21(6):833-40
Publication Type
Article
Date
Dec-2011
Author
M K Zebis
J. Bencke
L L Andersen
T. Alkjaer
C. Suetta
P. Mortensen
M. Kjaer
P. Aagaard
Author Affiliation
Institute of Sports Medicine Copenhagen, Bispebjerg Hospital, Copenhagen, Denmark. mettezebis@hotmail.com
Source
Scand J Med Sci Sports. 2011 Dec;21(6):833-40
Date
Dec-2011
Language
English
Publication Type
Article
Keywords
Adult
Anterior Cruciate Ligament - injuries - innervation
Athletic Injuries - etiology
Biomechanical Phenomena
Denmark
Electromyography
Female
Humans
Isometric Contraction - physiology
Movement - physiology
Muscle Fatigue - physiology
Risk Assessment - methods
Young Adult
Abstract
In sports, like team handball, fatigue has been associated with an increased risk of anterior cruciate ligament (ACL) injury. While effects of fatigue on muscle function are commonly assessed during maximal isometric voluntary contraction (MVC), such measurements may not relate to the muscle function during match play. The purpose of this study was to investigate the effect of muscle fatigue induced by a simulated handball match on neuromuscular strategy during a functional sidecutting movement, associated with the incidence of ACL injury. Fourteen female team handball players were tested for neuromuscular activity [electromyography (EMG)] during a sidecutting maneuver on a force plate, pre and post a simulated handball match. MVC was obtained during maximal isometric quadriceps and hamstring contraction. The simulated handball match consisted of exercises mimicking handball match activity. Whereas the simulated handball match induced a decrease in MVC strength for both the quadriceps and hamstring muscles (P
PubMed ID
20500560 View in PubMed
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Adaptation of a seated postural control measure for adult wheelchair users.

https://arctichealth.org/en/permalink/ahliterature173363
Source
Disabil Rehabil. 2005 Aug 19;27(16):951-9
Publication Type
Article
Date
Aug-19-2005
Author
Brigitte Gagnon
Claude Vincent
Luc Noreau
Author Affiliation
Rehabilitation Department, Faculty of Medicine, Laval University, Quebec City, Canada. claude.vincent@rea.ulaval.ca
Source
Disabil Rehabil. 2005 Aug 19;27(16):951-9
Date
Aug-19-2005
Language
English
Publication Type
Article
Keywords
Activities of Daily Living
Adult
Biomechanical Phenomena
Disabled Persons - rehabilitation
Equipment Design - standards
Humans
Mechanics
Posture - physiology
Quality of Life
Quebec
Wheelchairs - standards
Abstract
Clinical measures of seated postural control in adults are not standardized and most are derived from in-house tools. The purpose of this study is to adapt a pediatric instrument to evaluate seated postural control in adult wheelchair users.
The new instrument is called the Seated Postural Control Measure for Adults (SPCMA) 1.0. Five preliminary versions were pretested with some 20 adults by two raters and a group of experts.
This instrument comprises three sections: Section 1, level of sitting scale for adults (1 item, 7-point ordinal scale); Section 2, static postural alignment (22 items, 7-point ordinal scale); and Section 3, postural alignment after a dynamic activity, propulsion of the wheelchair on flat terrain and an incline (22 items, 7-point ordinal scale).
The SPCMA for Adults 1.0 improves the quality and uniformity of evaluations done by different raters, which facilitates more rigorous follow-up of clients over time, communication between professionals, and objective verification of the attainment of intervention objectives.
PubMed ID
16096248 View in PubMed
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Aerodynamic drag is not the major determinant of performance during giant slalom skiing at the elite level.

https://arctichealth.org/en/permalink/ahliterature119255
Source
Scand J Med Sci Sports. 2013 Feb;23(1):e38-47
Publication Type
Article
Date
Feb-2013
Author
M. Supej
L. Saetran
L. Oggiano
G. Ettema
N. Ĺ arabon
B. Nemec
H-C Holmberg
Author Affiliation
Department of Biomechanics, Faculty of Sport, University of Ljubljana, Ljubljana, Slovenia.
Source
Scand J Med Sci Sports. 2013 Feb;23(1):e38-47
Date
Feb-2013
Language
English
Publication Type
Article
Keywords
Athletic Performance - physiology
Biomechanical Phenomena
Energy Metabolism - physiology
Friction
Geographic Information Systems
Humans
Linear Models
Male
Skiing - physiology
Snow
Sweden
Time Factors
Wind
Young Adult
Abstract
This investigation was designed to (a) develop an individualized mechanical model for measuring aerodynamic drag (F(d) ) while ski racing through multiple gates, (b) estimate energy dissipation (E(d) ) caused by F(d) and compare this to the total energy loss (E(t) ), and (c) investigate the relative contribution of E(d) /E(t) to performance during giant slalom skiing (GS). Nine elite skiers were monitored in different positions and with different wind velocities in a wind tunnel, as well as during GS and straight downhill skiing employing a Global Navigation Satellite System. On the basis of the wind tunnel measurements, a linear regression model of drag coefficient multiplied by cross-sectional area as a function of shoulder height was established for each skier (r > 0.94, all P
PubMed ID
23121340 View in PubMed
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Age-related changes in bone-strength-associated geometry indices in naive human population.

https://arctichealth.org/en/permalink/ahliterature157603
Source
Anat Rec (Hoboken). 2008 Jul;291(7):835-44
Publication Type
Article
Date
Jul-2008
Author
Leonid Kalichman
Ida Malkin
Galya Bigman
Rakefet Matias
Markus J Seibel
Eugene Kobyliansky
Gregory Livshits
Author Affiliation
Department of Physical Therapy, The Stanley Steyer School of Health Professions, Tel Aviv University, Tel Aviv, Israel.
Source
Anat Rec (Hoboken). 2008 Jul;291(7):835-44
Date
Jul-2008
Language
English
Publication Type
Article
Keywords
Adolescent
Adult
Age Factors
Aged
Aged, 80 and over
Aging - pathology - physiology
Biomechanical Phenomena
Cohort Studies
Cross-Sectional Studies
Ethnic Groups
Female
Follow-Up Studies
Hand Bones - anatomy & histology - physiology - radiography
Humans
Linear Models
Male
Middle Aged
Rural Population
Russia
Sex Characteristics
Abstract
The aim of the present study was to evaluate age- and sex-related changes in the geometry parameters (metacarpal cortical index (MCI) and Breaking Bending Resistance Index [BBRI]) of long hand bones in a large Chuvashian cohort using cross-sectional and longitudinal study designs. The data were gathered in 1994 (557 individuals) and 2002 (513 individuals). The latter sample included 260 individuals who were studied only during the second expedition, and 253 individuals who were previously investigated in 1994. Statistical analyses included a maximum likelihood-based model-fitting technique and a t-test comparison. Our study describes age-related MCI and BBRI changes in both sexes from the age of 18 years to 84 years. At any age, the BBRI values were higher in males than in females, but MCI was greater in females than in males before age 50 and lower after that age. The study provides initial evidence of a secular trend in MCI and BBRI. In male hand bones, the cortex became relatively thicker and it better resisted bending and breaking in comparison to individuals born at the beginning of the 20th century. In females, the trend toward higher MCI values can be observed only in those born between 1936 and 1966 and the trend toward higher BBRI values stopped in 1950.
PubMed ID
18429008 View in PubMed
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The Analgesic Effect of Obturator Nerve Block Added to a Femoral Triangle Block After Total Knee Arthroplasty: A Randomized Controlled Trial.

https://arctichealth.org/en/permalink/ahliterature281001
Source
Reg Anesth Pain Med. 2016 Jul-Aug;41(4):445-51
Publication Type
Article
Author
Charlotte Runge
Jens Børglum
Jan Mick Jensen
Tina Kobborg
Anette Pedersen
Jon Sandberg
Lone Ramer Mikkelsen
Morten Vase
Thomas Fichtner Bendtsen
Source
Reg Anesth Pain Med. 2016 Jul-Aug;41(4):445-51
Language
English
Publication Type
Article
Keywords
Administration, Intravenous
Aged
Aged, 80 and over
Analgesics, Opioid - administration & dosage
Arthroplasty, Replacement, Knee - adverse effects
Biomechanical Phenomena
Denmark
Female
Femoral Nerve - diagnostic imaging
Humans
Knee Joint - innervation - physiopathology - surgery
Male
Middle Aged
Morphine - administration & dosage
Nerve Block - adverse effects - methods
Obturator Nerve - diagnostic imaging
Pain Measurement
Pain, Postoperative - diagnosis - etiology - prevention & control
Postoperative Nausea and Vomiting - etiology - prevention & control
Recovery of Function
Time Factors
Treatment Outcome
Ultrasonography, Interventional
Abstract
Total knee arthroplasty (TKA) is associated with severe pain, and effective analgesia is essential for the quality of postoperative care and ambulation. The analgesic effects of adding an obturator nerve block (ONB) to a femoral triangle block (FTB) after TKA have not been tested previously. We hypothesized that combined ONB and FTB will reduce opioid consumption and pain compared with those of a single FTB or local infiltration analgesia (LIA).
Seventy-eight patients were randomized to combined ONB and FTB, single FTB, or LIA after primary unilateral TKA. The primary outcome was morphine consumption during the first 24 postoperative hours. Secondary outcomes included morphine consumption during the first 48 postoperative hours, pain at rest and passive knee flexion, nausea and vomiting, cumulated ambulation score, and Timed Up and Go test.
Seventy-five patients were included in the analysis. The total intravenous morphine consumption during the first 24 postoperative hours was 2 mg (interquartile range [IQR], 0-15) in the combined ONB and FTB group, 20 mg (IQR, 10-26) in the FTB group (P = 0.0007), and 17 mg (IQR, 10-36) in the LIA group (P = 0.002). The combined ONB and FTB group displayed reduced pain, nausea, and vomiting compared with the other groups. The ambulation tests showed no statistically significant differences between the groups.
Addition of ONB to FTB significantly reduced opioid consumption and pain after TKA compared with a single FTB or LIA, without impaired ambulation.
PubMed ID
27171822 View in PubMed
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Analysis and evolution of head injury in football.

https://arctichealth.org/en/permalink/ahliterature178620
Source
Neurosurgery. 2004 Sep;55(3):649-55
Publication Type
Article
Date
Sep-2004
Author
Michael L Levy
Burak M Ozgur
Cherisse Berry
Henry E Aryan
Michael L J Apuzzo
Author Affiliation
Division of Neurosurgery, University of California at San Diego School of Medicine, San Diego, California, USA. mlevy@chsd.org
Source
Neurosurgery. 2004 Sep;55(3):649-55
Date
Sep-2004
Language
English
Publication Type
Article
Keywords
Adolescent
Adult
Animals
Athletic Injuries - epidemiology - physiopathology - prevention & control
Biomechanical Phenomena
Brain - physiopathology
Brain Concussion - epidemiology - physiopathology - prevention & control
Canada
Cross-Sectional Studies
Disease Models, Animal
Football - injuries
Head Protective Devices - standards
Humans
Recurrence
Risk factors
Sports Equipment - standards
United States
Abstract
To review head injury in football through historical, anatomic, and physiological analysis.
We obtained data from a thorough review of the literature.
The reported incidence of concussion among high school football players dropped from 19% in 1983 to 4% in 1999. During the 1997 Canadian Football League season, players with a previous loss of consciousness in football were 6.15 times more likely to experience a concussion than players without a previous loss of consciousness (P
PubMed ID
15335432 View in PubMed
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Analysis of aortic wall stress and rupture risk in patients with abdominal aortic aneurysm with a gender perspective.

https://arctichealth.org/en/permalink/ahliterature136255
Source
J Vasc Surg. 2011 Aug;54(2):295-9
Publication Type
Article
Date
Aug-2011
Author
Emma Larsson
Fausto Labruto
T Christian Gasser
Jesper Swedenborg
Rebecka Hultgren
Author Affiliation
Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden. emma.larsson@ki.se
Source
J Vasc Surg. 2011 Aug;54(2):295-9
Date
Aug-2011
Language
English
Publication Type
Article
Keywords
Aged
Aged, 80 and over
Aorta, Abdominal - physiopathology - radiography
Aortic Aneurysm, Abdominal - complications - physiopathology - radiography
Aortic Rupture - etiology - physiopathology - radiography
Aortography - methods
Biomechanical Phenomena
Female
Finite Element Analysis
Humans
Image Interpretation, Computer-Assisted
Male
Middle Aged
Models, Cardiovascular
Retrospective Studies
Risk assessment
Risk factors
Sex Factors
Stress, mechanical
Sweden
Tomography, X-Ray Computed
Abstract
The most commonly used predictor of rupture of an abdominal aortic aneurysm (AAA) is the diameter; however, this does not estimate the true risk for each patient. Why women with AAAs have an increased growth rate, weaker aortic wall, and increased risk for rupture is yet unclear. It is likely that geometrical and biomechanical properties contribute to found gender differences. Several studies have shown that peak wall stress (PWS) and peak wall rupture risk (PWRR), predicted by a finite element (FE) analysis of AAAs derived from computed tomography (CT), is a better predictor of rupture than maximum diameter. The purpose of this study was to investigate if women with AAAs have an increased PWS and PWRR using an FE model compared to men.
Fifteen men and 15 women (AAAs 4-6 cm) were included. AAA geometry was derived from CT scans, and PWS and PWRR were estimated using the FE method. Comparisons were made by t test and Mann-Whitney test.
Mean age (women 73 years old vs men 71 years old) and mean AAA diameter was similar (49.7 mm vs 50.1 mm) for women and men. PWS did not differ for women 184 and men 198 kPa. PWRR was 0.54 (0.28-0.85) for women and 0.43 (0.24-0.66) for men, P = .06.
This is the first analysis of stress and strength of the aneurysm wall with a gender perspective. The reported higher rupture risk for women has previously not been tested with geometrical and biomechanical properties. PWS did not differ, but the PWRR was slightly higher in women. However, the difference did not reach statistical significance, probably due to the small sample size. In summary, the results in the present study suggest that differences in biomechanical properties could be a contributing explanation for the higher rupture risk reported for female patients with AAAs.
PubMed ID
21397436 View in PubMed
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An evaluation of patient lifting techniques.

https://arctichealth.org/en/permalink/ahliterature218197
Source
Ergonomics. 1994 May;37(5):921-32
Publication Type
Article
Date
May-1994
Author
G H Winkelmolen
J A Landeweerd
M R Drost
Author Affiliation
Occupational Health Center, Dordrecht, The Netherlands.
Source
Ergonomics. 1994 May;37(5):921-32
Date
May-1994
Language
English
Publication Type
Article
Keywords
Adult
Biomechanical Phenomena
Female
Humans
Lifting
Middle Aged
Nursing Care - methods
Posture - physiology
Abstract
In the present laboratory study five two-person manual lifting techniques were evaluated as to the amount of physical exertion required of the nurses. Ten female volunteers served as nurses; two healthy volunteers (weight: 55 kg and 75 kg) served as passive patients. The working postures and motions were recorded on videotape. The data thus obtained were used in a anatomical-biomechanical analysis. The perceived exertion by the nurses was measured as well. In almost all situations the compressive forces on the nurse's spine exceeded their acceptable limit of 3425 N. Differences between the lifting techniques were most obvious when the 55 kg patient was lifted. Ratings of the perceived exertion (RPE scores) were higher in symmetrical handling than in asymmetrical handling. The three techniques using asymmetrical hand positions produced less subjective stress. RPE scores and rotation of the back were negatively correlated. Rotating the back when moving a patient from one side to the other seems to ease the task. On the whole, the results of the biomechanical evaluation are in line with the subjective perception of the nurses. In both instances the barrow lift appeared to be the most strenuous one; the Australian lift resulted in low compressive forces and a moderate level of perceived exertion.
PubMed ID
8206060 View in PubMed
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Arthroscopic partial meniscectomy in middle-aged patients with mild or no knee osteoarthritis: a protocol for a double-blind, randomized sham-controlled multi-centre trial.

https://arctichealth.org/en/permalink/ahliterature116022
Source
BMC Musculoskelet Disord. 2013;14:71
Publication Type
Article
Date
2013
Author
Kristoffer B Hare
L Stefan Lohmander
Robin Christensen
Ewa M Roos
Author Affiliation
Institute of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark. kbhr@regionsjaelland.dk
Source
BMC Musculoskelet Disord. 2013;14:71
Date
2013
Language
English
Publication Type
Article
Keywords
Arthralgia - diagnosis - physiopathology - surgery
Arthroscopy - adverse effects - economics - methods
Biomechanical Phenomena
Denmark
Disability Evaluation
Double-Blind Method
Female
Health Care Costs
Humans
Knee Injuries - diagnosis - economics - physiopathology - surgery
Male
Menisci, Tibial - injuries - physiopathology - radiography - surgery
Middle Aged
Muscle strength
Osteoarthritis, Knee - diagnosis - economics - physiopathology - surgery
Pain Measurement
Prospective Studies
Recovery of Function
Research Design
Severity of Illness Index
Time Factors
Treatment Outcome
Abstract
Arthroscopic partial meniscectomy has been shown to be of no benefit to patients with concomitant knee osteoarthritis, but the optimal treatment of a degenerative meniscus tear in patients with mild or no knee osteoarthritis is unknown. This article describes the rationale and methodology of a randomized sham-controlled trial to assess the benefit of arthroscopic partial meniscectomy of a medial meniscus tear in patients with mild or no knee osteoarthritis. The objective of the study is to test whether the benefit from arthroscopic partial meniscectomy in patients with knee pain, medial meniscus lesion and mild/no knee osteoarthritis, is greater after arthroscopic partial meniscectomy than following sham surgery.
We will conduct a randomized controlled trial of treatment for degenerative meniscus tears in middle-aged patients (aged 35-55 years) with an MRI-verified medial meniscus lesion and mild or no knee radiographic osteoarthritis (grade 0-2 on the Kellgren & Lawrence scale). Patients will be randomized to receive either conventional arthroscopic partial meniscectomy or a sham surgery procedure. The primary outcome will be the KOOS5 derived from the 'Knee Injury and Osteoarthritis Outcome Score' at 2 years follow-up. Secondary outcomes at 2 years will include all five individual subscales of the KOOS, a global perceived effect score, the Short-Form-36 health status score, EQ-5D for economic appraisal and objective tests of muscle strength and physical function. Radiographic knee osteoarthritis will be evaluated at 5 years.
Demonstration of no additional benefit from arthroscopic partial meniscectomy on pain and function should lead to a change in clinical care of patients with a degenerative meniscus tear. The results of this study will provide empirical evidence for the potential benefit/harm of arthroscopic partial meniscectomy compared to a masked sham-therapeutics intervention.
Notes
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PubMed ID
23442554 View in PubMed
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225 records – page 1 of 23.