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https://www.readbyqxmd.com/read/29045317/the-relationships-between-height-arm-length-and-leg-length-on-the-mechanics-of-the-conventional-and-high-handle-hexagonal-bar-deadlift
#1
Robert G Lockie, Matthew R Moreno, Ashley J Orjalo, Adrina Lazar, Tricia M Liu, Alyssa A Stage, Samantha A Birmingham-Babauta, John J Stokes, Dominic V Giuliano, Fabrice G Risso, DeShaun L Davis, Samuel J Callaghan
The study investigated relationships between arm (AL) and leg length (LL) and conventional deadlift (CD) and high-handle hexagonal bar deadlift (HHBD) mechanics. Twenty-three resistance-trained subjects (14 males, 9 females) completed a one-repetition maximum (1RM) CD and HHBD. A linear position transducer was used to measure: lift distance and duration; peak and mean power, velocity, and force; time to peak power and velocity; and work. Right AL and LL were measured, and AL-to-LL ratio (AL:LL) was also calculated...
October 16, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29045315/a-single-dose-of-oral-atp-supplementation-improves-performance-and-physiological-response-during-lower-body-resistance-exercise-in-recreational-resistance-trained-males
#2
Marcelo C Freitas, Jason M Cholewa, Jose Gerosa-Neto, Daniela C Gonçalves, Erico C Caperuto, Fábio S Lira, Fabrício E Rossi
The aim of this study was to investigate the acute effect of ATP supplementation on performance and physiological responses during resistance exercise in recreationally resistance trained males. Eleven men (age= 27.5±5.5 yrs, weight= 83.4±9.8 kg, height= 182±0.04 cm) completed two randomized, double-blind trials: ATP supplement condition (ATP=400mg) or a placebo condition. Thirty minutes after supplement consumption, subjects performed four sets of half-squats until momentary muscular failure at 80% of the 1RM with two minutes of recovery between sets...
October 16, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29042671/credit-assignment-between-body-and-object-probed-by-an-object-transportation-task
#3
Gaiqing Kong, Zhihao Zhou, Qining Wang, Konrad Kording, Kunlin Wei
It has been proposed that learning from movement errors involves a credit assignment problem: did I misestimate properties of the object or those of my body? For example, an overestimate of arm strength and an underestimate of the weight of a coffee cup can both lead to coffee spills. Though previous studies have found signs of simultaneous learning of the object and of the body during object manipulation, there is little behavioral evidence about their quantitative relation. Here we employed a novel weight-transportation task, in which participants lift the first cup filled with liquid while assessing their learning from errors...
October 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29031589/implicit-evaluations-and-physiological-threat-responses-in-people-with-persistent-low-back-pain-and-fear-of-bending
#4
J P Caneiro, Peter O'Sullivan, Anne Smith, G Lorimer Moseley, Ottmar V Lipp
BACKGROUND AND AIMS: Pain and protective behaviour are dependent on implicit evaluations of danger to the body. However, current assessment of perceived danger relies on self-report, on information of which the person is aware and willing to disclose. To overcome this limitation, attempts have been made to investigate implicit evaluation of movement-related threatening images in people with persistent low back pain (PLBP) and pain-related fear. Lack of specificity of the sample and stimuli limited those explorations...
October 11, 2017: Scandinavian Journal of Pain
https://www.readbyqxmd.com/read/29026726/hand-grip-strength-and-gender-allometric-normalization-in-older-adults-and-implications-for-the-niosh-lifting-equation
#5
Trish Gail Sevene, Joseph Berning, Chad Harris, Mike Climstein, Kent Jason Adams, Mark DeBeliso
BACKGROUND: Many countries are experiencing an aging workforce with women workers making up a growing proportion. Workplaces often require employees to complete lifting tasks that require the ability of the hand to grasp an implement (coupling). The National Institute for Occupational Safety and Health (NIOSH) has developed an equation for manual lifting tasks hoping to minimize the potential for a workplace back-injury related to a lifting task. The NIOSH lifting equation relies upon stress variables including a coupling factor...
July 2017: Journal of Lifestyle Medicine
https://www.readbyqxmd.com/read/28991732/feasibility-of-a-biomechanically-assistive-garment-to-reduce-low-back-loading-during-leaning-and-lifting
#6
Erik P Lamers, Aaron J Yang, Karl E Zelik
GOAL: The purpose of this study was: (i) to design and fabricate a biomechanically-assistive garment which was sufficiently lightweight and low-profile to be worn underneath, or as, clothing, and then (ii) to perform human subject testing to assess the ability of the garment to offload the low back muscles during leaning and lifting. METHODS: We designed a prototype garment which acts in parallel with the low back extensor muscles to reduce forces borne by the lumbar musculature...
October 9, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28986087/risk-factors-for-injury-associated-with-low-moderate-and-high-mileage-road-marching-in-a-u-s-army-infantry-brigade
#7
Anna Schuh-Renner, Tyson L Grier, Michelle Canham-Chervak, Veronique D Hauschild, Tanja C Roy, Jeremy Fletcher, Bruce H Jones
OBJECTIVES: Road marching is an important physical training activity that prepares soldiers for a common occupational task. Continued exploration of risk factors for road marching-related injuries is needed. This analysis has assessed the association between modifiable characteristics of physical training and injury risk. METHODS: Injuries in the previous 6 months were captured by survey from 831 U.S. Army infantry soldiers. Road marching-related injuries were reported as those attributed to road marching on foot for specified distances while carrying equipment...
August 24, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28941870/temporal-changes-in-motor-variability-during-prolonged-lifting-lowering-and-the-influence-of-work-experience
#8
Alireza Sedighi, Maury A Nussbaum
Existing research indicates that repetitive motions are strongly correlated with the development of work-related musculoskeletal disorders (WMSDs). Resulting from the redundant degrees-of-freedom in the human body, there are variations in motions that occur while performing a repetitive task. These variations are termed motor variability (MV), and may be beneficial for reducing WMSD risks. To better understand the potential role of MV in preventing injury risk, we evaluated the effects of fatigue on MV using data collected during a lab-based prolonged, repetitive lifting/lowering task...
September 15, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28938775/effects-of-different-types-of-dark-brooders-on-injurious-pecking-damage-and-production-related-traits-at-rear-and-lay-in-layers
#9
A B Riber, D A Guzman
Injurious pecking (IP) remains one of the major welfare challenges in housing of laying hens worldwide due to the negative consequences it inflicts on animal welfare and economy. One potential solution to reduce IP is the use of dark brooders as the primary heat source during rearing. The objective was to investigate effects of rearing layer chicks with different management strategies and size allowances of dark brooders on IP and production-related traits during rear and lay. Groups of 100 to 103 Isa Warren chicks were reared either with one of 4 brooder types (n = 4 per treatment) or with whole-house heating (control: n = 6)...
October 1, 2017: Poultry Science
https://www.readbyqxmd.com/read/28932006/a-newly-developed-floor-chair-placed-on-an-office-chair-reduces-lumbar-muscle-fatigue-by-cyclically-changing-its-lumbar-supporting-shape
#10
Tadamitsu Matsuda, Takayuki Koyama, Yasushi Kurihara, Miki Tagami, Yasuaki Kusumoto, Osamu Nitta
[Purpose] This study investigated lumbar muscle fatigue before and after maintaining a seated position for one hour, lumbar and pelvic inclination angle change, in subjects with and without active lumber support. [Subjects and Methods] Fourteen healthy subjects randomized into two groups sat on a floor chair, placed on an office chair, that cyclically changed its lumbar supporting shape to provide active lumbar support (ALS) or no ALS for one hour. Before and after, we measured the frequency of muscle waveforms of the trunk extensor muscles when the subjects lifted an object weighing 10% of their body weight, using both hands while seated...
September 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28929542/visuomotor-effects-of-body-part-movements-presented-in-the-first-person-perspective-on-imitative-behavior
#11
Rui Watanabe, Takahiro Higuchi, Yoshiaki Kikuchi, Masato Taira
Imitative stimuli presented from a first-person perspective (FPP) produce stronger visuomotor effects than those presented from a third-person perspective (TPP) due to the relatively greater response of the mirror neuron system (MNS) to FPP stimuli. Some previous studies utilizing TPP stimuli have reported no differences in MNS activity between moving and static bodies' stimuli. However, few studies have compared visuomotor effects of such stimuli when presented in the FPP. To clarify this issue, we measured cortical activation in 17 participants during a functional magnetic resonance imaging (MRI) imitation task involving three conditions: moving (a lifting finger was presented), static (an "X" appeared on a static finger), and control (an "X" appeared on a button)...
September 20, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28888899/association-between-body-mass-index-and-individual-characteristics-and-the-school-context-a-multilevel-study-with-portuguese-children
#12
Rafael S Henrique, Thayse N Gomes, Go Tani, José A R Maia
OBJECTIVE: The aim of this study was to examine the association between individual and school context characteristics with the body mass index of Portuguese children. METHODS: The sample comprised 1641 children (847 boys) aged 6-10 years from the North and Central regions of Portugal. Regarding the individual characteristics, age, gender, city of residence, levels of physical activity, and physical fitness were assessed. Concerning the school context characteristics, the surrounding environment, school size, presence of recreational characteristics and space, and presence of a sports court and of physical education classes were considered...
September 8, 2017: Jornal de Pediatria
https://www.readbyqxmd.com/read/28877646/comparison-of-canadian-firefighters-and-normal-controls-based-on-the-submaximal-fitness-testing-and-strength-considering-age-and-gender
#13
Goris Nazari, Joy C MacDermid, Kathryn E Sinden R Kin, Tom J Overend
INTRODUCTION: Few studies have addressed whether the firefighters are more fit than the general population and possess sufficient levels of aerobic capacity and muscle strength to perform on duty tasks in a safe and efficient manner, considering age and gender. We aimed to evaluate the fitness levels of Hamilton firefighters, and to determine the effects of age and gender. METHODS: 89 participants were recruited. The Modified Canadian Aerobic Fitness Test was used to determine participants' estimated maximal oxygen consumptions (VO2-max) levels...
September 7, 2017: International Journal of Occupational Safety and Ergonomics: JOSE
https://www.readbyqxmd.com/read/28872386/on-the-importance-of-front-side-mechanics-in-athletics-sprinting
#14
Thomas Haugen, Jørgen Danielsen, Leif Olav Alnes, David McGhie, Øyvind Sandbakk, Gertjan Ettema
Practitioners have for many years argued that athletic sprinters should optimise front-side mechanics (leg motions occurring in front of the extended line through the torso) and minimise back-side mechanics. This study aimed to investigate if variables related to front- and back-side mechanics can be distinguished from other previously highlighted kinematic variables (spatiotemporal variables and variables related to segment configuration and velocities at touchdown) in how they statistically predict performance...
September 5, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28869537/an-adaptive-classification-strategy-for-reliable-locomotion-mode-recognition
#15
Ming Liu, Fan Zhang, He Helen Huang
Algorithms for locomotion mode recognition (LMR) based on surface electromyography and mechanical sensors have recently been developed and could be used for the neural control of powered prosthetic legs. However, the variations in input signals, caused by physical changes at the sensor interface and human physiological changes, may threaten the reliability of these algorithms. This study aimed to investigate the effectiveness of applying adaptive pattern classifiers for LMR. Three adaptive classifiers, i.e...
September 4, 2017: Sensors
https://www.readbyqxmd.com/read/28834891/interdisciplinary-rehabilitation-for-a-patient-with-incomplete-cervical-spinal-cord-injury-and-multimorbidity-a-case-report
#16
Robert D Vining, Donna M Gosselin, Jeb Thurmond, Kimberlee Case, Frederick R Bruch
RATIONALE: This report describes interdisciplinary rehabilitation for a 51-year-old male recovering from incomplete cervical spinal cord injury (SCI) and multiple comorbidities following an automobile accident. PATIENT CONCERNS: The patient was admitted to a rehabilitation specialty hospital approximately 2 months post SCI and 2 separate surgical fusion procedures (C3-C6). DIAGNOSES: Clinical presentation at the rehabilitation hospital included moderate to severe motor strength loss in both upper and lower extremities, a percutaneous endoscopic gastronomy tube (PEG), dysphagia, bowel/bladder incontinence, dependence on a mechanical lift and tilting wheelchair due to severe orthostatic hypotension, and pre-existing shoulder pain from bilateral joint degeneration...
August 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28828088/the-effect-of-different-resistance-training-load-schemes-on-strength-and-body-composition-in-trained-men
#17
Charles Ricardo Lopes, Marcelo Saldanha Aoki, Alex Harley Crisp, Renê Scarpari de Mattos, Miguel Alves Lins, Gustavo Ribeiro da Mota, Brad Jon Schoenfeld, Paulo Henrique Marchetti
The purpose of this study was to evaluate the impact of moderate-load (10 RM) and low-load (20 RM) resistance training schemes on maximal strength and body composition. Sixteen resistance-trained men were randomly assigned to 1 of 2 groups: a moderate-load group (n = 8) or a low-load group (n = 8). The resistance training schemes consisted of 8 exercises performed 4 times per week for 6 weeks. In order to equate the number of repetitions performed by each group, the moderate load group performed 6 sets of 10 RM, while the low load group performed 3 sets of 20 RM...
September 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28827239/validation-of-newly-developed-and-redesigned-key-indicator-methods-for-assessment-of-different-working-conditions-with-physical-workloads-based-on-mixed-methods-design-a-study-protocol
#18
Andre Klussmann, Falk Liebers, Felix Brandstädt, Marianne Schust, Patrick Serafin, Andreas Schäfer, Hansjürgen Gebhardt, Bernd Hartmann, Ulf Steinberg
INTRODUCTION: The impact of work-related musculoskeletal disorders is considerable. The assessment of work tasks with physical workloads is crucial to estimate the work-related health risks of exposed employees. Three key indicator methods are available for risk assessment regarding manual lifting, holding and carrying of loads; manual pulling and pushing of loads; and manual handling operations. Three further KIMs for risk assessment regarding whole-body forces, awkward body postures and body movement have been developed de novo...
August 21, 2017: BMJ Open
https://www.readbyqxmd.com/read/28813995/a-novel-human-effort-estimation-method-for-knee-assistive-exoskeletons
#19
Lorenzo Saccares, Anais Brygo, Ioannis Sarakoglou, Nikos G Tsagarakis
In this work we present a novel method to estimate online the torques at the knee joints with the goal to generate reference signals for knee assistive devices. One of the main advantages of the proposed approach is its reduced sensing requirements, which leads to an ergonomic setup with minimal instrumentation, especially above the knee and of the upper body. Indeed, only the measurement of the forces and torques exchanged between the ground and the user's feet, the posture of the shanks, and the model of the user's shank itself are needed for the estimation of the knee torque...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28783203/cumulative-occupational-mechanical-exposures-during-working-life-and-risk-of-sickness-absence-and-disability-pension-prospective-cohort-study
#20
Emil Sundstrup, Åse Marie Hansen, Erik Lykke Mortensen, Otto Melchior Poulsen, Thomas Clausen, Reiner Rugulies, Anne Møller, Lars L Andersen
Objectives The aim of this study was to determine the prospective association of cumulative mechanical exposure during working life with health-related labor market outcomes. Methods This prospective cohort study combines data from 5076 older workers (age 49-63 years) from the Copenhagen Aging and Midlife Biobank with a job exposure matrix and a national register containing information on social transfer payment. By coding individual job histories from the Danish version of ISCO-codes (International Standard Classification of Occupations), we calculated cumulative occupational mechanical exposures from a JEM for ton-years (lifting 1000 kg each day in one year), lifting-years (lifting loads weighing ≥20 kg >10 times each day in one year), kneeling-years (kneeling for one hour each day in one year) and vibration-years (whole-body vibration for one hour each day in one year)...
August 7, 2017: Scandinavian Journal of Work, Environment & Health
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