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https://www.readbyqxmd.com/read/27893476/comparison-of-muscle-involvement-and-posture-between-the-conventional-deadlift-and-a-walk-in-style-deadlift-machine
#1
Benjamin J Snyder, Courtney P Cauthen, Scott R Senger
The deadlift exercise is one of the most effective exercises for developing lower-body strength; however, technique errors can lead to low back injuries. The use of a 'walk-in' deadlift machine removes the weight bar by using a lever system with independent handles on either side of the body. Theoretically, this would allow alignment of the load with the center of gravity, encouraging a more upright torso and decreasing the involvement of the low back extensors. This study compared trunk angle, knee angle and electrical activity of key muscles between the conventional deadlift (CDL) and two foot positions (ball of foot or toe alignment) with pronated grip, (called BallPro and ToePro) of a walk-in deadlift machine among high-skilled and low-skilled lifters...
November 16, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27875493/acute-lumbar-paraspinal-myonecrosis-in-football-players-with-sickle-cell-trait-a-case-series
#2
E Randy Eichner, Brock Schnebel, Scott Anderson, James R Clugston, Heath Hale, Charlie Michaudet, John M Small
We report 6 cases of a novel syndrome of acute, exertional low back pain (LBP) in football players, 5 in college and one in the National Football League (NFL). All 6 are African-Americans with sickle cell trait (SCT). The acute LBP is severe and can be disabling, and the condition can be confused with muscle strain, discogenic pain, stress fracture, or other problems in athletes. Our evidence shows that this syndrome is caused by lumbar paraspinal myonecrosis (LPSMN), which likely often contributes to the lumbar paraspinal compartment syndrome...
November 21, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27806005/effect-of-1-rm-80-rm-and-50-rm-strength-exercise-in-trained-individuals-on-variations-in-plasma-redox-biomarkers
#3
Tatiana G Polotow, Tácito P Souza-Junior, Ricardo C Sampaio, Alexandre R Okuyama, Douglas Ganini, Cristina V Vardaris, Ragami C Alves, Steven R McAnulty, Marcelo P Barros
For decades, scientists have examined the participation of oxygen/nitrogen species (ROS/RNS) in anaerobic-like exercises, especially weight lifting and resistance exercises. The balance between the production of oxyradicals and antioxidant responses during anaerobic-like exercises is essential to assure adaptation to the physiological benefits of strength training and to prevent chronic harmful effects. The aim of this study is to examine the hypothesis that different weight loads (1-RM, 80%RM, and 50%RM) lifted until exhaustion could impose distinct oxidative insults and elicit diverse antioxidant responses in plasma of young trained subjects...
October 27, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27784953/injury-surveillance-and-safety-considerations-for-large-format-lead-acid-batteries-used-in-mining-applications
#4
Miguel Angel Reyes, Thomas Novak
Large lead-acid batteries are predominantly used throughout the mining industry to power haulage, utility, and personnel-carrier vehicles. Without proper operation and maintenance, the use of these batteries can introduce mechanical and electrical hazards, particularly in the confined, and potentially dangerous, environment of an underground coal mine. A review of the Mine Safety and Health Administration accident/illness/injury database reveals that a significant number of injuries occur during the maintenance and repair of lead-acid batteries...
March 2016: IEEE Transactions on Industry Applications
https://www.readbyqxmd.com/read/27734436/pectoralis-major-injury-during-basic-airborne-training
#5
Sean McIntire, Lee Boujie, John Leasiolagi
Injuries involving rupture of the pectoralis major are relatively rare. When they do occur, it is mostly frequently in a young, athletic man. The most common cause is weight lifting that results in eccentric muscle contraction (muscle contraction against an overbearing force, leading to muscle lengthening)-specifically, the bench press. Other mechanisms for this injury include forceful abduction and external rotation of the arm. Injury can occur anywhere along the pectoralis major from its medial origin on the sternum and clavicle to its lateral tendinous insertion on the humerus...
2016: Journal of Special Operations Medicine: a Peer Reviewed Journal for SOF Medical Professionals
https://www.readbyqxmd.com/read/27708492/organism-encumbrance-of-cardiac-surgeon-during-surgery
#6
Ilirijana Haxhibeqiri Karabdic, Fikret Veljovic, Slavenka Straus
INTRODUCTION: Most everyday activities, performed over a long period leads to performance degradation of skeletal muscles as well as spinal column which is reflected in the reduction of maximum force, reduction of the speed of response, reducing control of the movement etc. Although until now many mathematical models of muscles are developed, very small number takes into account the fatigue, and those models that take into account changes in the characteristics of muscles for extended activities, generally considered tiring under certain conditions...
July 16, 2016: Acta Informatica Medica: AIM
https://www.readbyqxmd.com/read/27703399/acute-chest-pain-after-bench-press-exercise-in-a-healthy-young-adult
#7
Janet A Smereck, Argyro Papafilippaki, Sawali Sudarshan
Bench press exercise, which involves repetitive lifting of weights to full arm extension while lying supine on a narrow bench, has been associated with complications ranging in acuity from simple pectoral muscle strain, to aortic and coronary artery dissection. A 39-year-old man, physically fit and previously asymptomatic, presented with acute chest pain following bench press exercise. Diagnostic evaluation led to the discovery of critical multivessel coronary occlusive disease, and subsequently, highly elevated levels of lipoprotein (a)...
2016: Open Access Emergency Medicine: OAEM
https://www.readbyqxmd.com/read/27701422/differential-responses-of-post-exercise-recovery-of-leg-blood-flow-and-oxygen-uptake-kinetics-in-hfpef-versus-hfref
#8
Richard B Thompson, Joseph J Pagano, Kory W Mathewson, Ian Paterson, Jason R Dyck, Dalane W Kitzman, Mark J Haykowsky
The goals of the current study were to compare leg blood flow, oxygen extraction and oxygen uptake (VO2) after constant load sub-maximal unilateral knee extension (ULKE) exercise in patients with heart failure with reduced ejection fraction (HFrEF) compared to those with preserved ejection fraction (HFpEF). Previously, it has been shown that prolonged whole body VO2 recovery kinetics are directly related to disease severity and all-cause mortality in HFrEF patients. To date, no study has simultaneously measured muscle-specific blood flow and oxygen extraction post exercise recovery kinetics in HFrEF or HFpEF patients; therefore it is unknown if muscle VO2 recovery kinetics, and more specifically, the recovery kinetics of blood flow and oxygen extraction at the level of the muscle, differ between HF phenotypes...
2016: PloS One
https://www.readbyqxmd.com/read/27676744/shoulder-joint-moment-work-and-power-during-slow-underwater-scapular-plane-abduction-adduction
#9
Jessy Lauer, Stéphane Vigier, Frédéric Delage, Alain Meudec, Jean-Michel Pollet, João Paulo Vilas-Boas, Annie Rouard
OBJECTIVE: Aquatic shoulder exercises are widely implemented into rehabilitation programs to provide early muscle strengthening and improved joint mobility. However, since the drag - the force exerted by the water on the moving segments - is very hard to measure, an in-depth knowledge of internal joint load is lacking, which ultimately prevents healthcare professionals from understanding all clinical implications. For the first time, shoulder joint moment, work, and power were calculated through a novel, validated numerical approach coupling fluid flow simulations and inverse dynamics...
September 2016: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/27609759/flying-high-limits-to-flight-performance-by-sparrows-on-the-qinghai-tibet-plateau
#10
Yan-Feng Sun, Zhi-Peng Ren, Yue-Feng Wu, Fu-Min Lei, Robert Dudley, Dong-Ming Li
Limits to flight performance at high altitude potentially reflect variable constraints deriving from the simultaneous challenges of hypobaric, hypodense and cold air. Differences in flight-related morphology and maximum lifting capacity have been well characterized for different hummingbird species across elevational gradients, but relevant within-species variation has not yet been identified in any bird species. Here we evaluate load-lifting capacity for Eurasian tree sparrow (Passer montanus) populations at three different elevations in China, and correlate maximum lifted loads with relevant anatomical features including wing shape, wing size, and heart and lung masses...
November 15, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27564994/effect-of-an-unstable-load-on-primary-and-stabilizing-muscles-during-the-bench-press
#11
Stephanie J Ostrowski, Lara A Carlson, Michael A Lawrence
Unstable resistance exercises are performed to increase activity of stabilizing muscles. The premise is that this increase in activity will yield greater strength gains than traditional resistance exercises. The purpose of this study was to determine if an unstable load increases muscle activity of stabilizing muscles during a bench press as compared to a standard bench press with a typical load. Fourteen resistance-trained males (age 24.2 ± 2.7 yr, mass 84.8 ± 12.0 kg, height 1.77 ± 0.05 m, weight lifting experience 9...
May 19, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27539495/contractile-properties-of-motor-units-and-expression-of-myosin-heavy-chain-isoforms-in-rat-fast-type-muscle-after-volitional-weight-lifting-training
#12
Dawid Łochyński, Dominik Kaczmarek, Włodzimierz Mrówczyński, Wojciech Warchoł, Joanna Majerczak, Janusz Karasiński, Michał Korostyński, Jerzy A Zoladz, Jan Celichowski
Dynamic resistance training increases the force and speed of muscle contraction, but little is known about modifications to the contractile properties of the main physiological types of motor units (MUs) that contribute to these muscle adaptations. Although the contractile profile of MU muscle fibers is tightly coupled to myosin heavy chain (MyHC) protein expression, it is not well understood if MyHC transition is a prerequisite for modifications to the contractile characteristics of MUs. In this study, we examined MU contractile properties, the mRNA expression of MyHC, parvalbumin, and sarcoendoplasmic reticulum Ca(2+) pump isoforms, as well as the MyHC protein content after 5 wk of volitional progressive weight-lifting training in the medial gastrocnemius muscle in rats...
October 1, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27484459/a-biologically-assisted-curved-muscle-model-of-the-lumbar-spine-model-validation
#13
Jaejin Hwang, Gregory G Knapik, Jonathan S Dufour, Thomas M Best, Safdar N Khan, Ehud Mendel, William S Marras
BACKGROUND: Biomechanical models have been developed to predict spinal loads in vivo to assess potential risk of injury in workplaces. Most models represent trunk muscles with straight-lines. Even though straight-line muscles behave reasonably well in simple exertions, they could be less reliable during complex dynamic exertions. A curved muscle representation was developed to overcome this issue. However, most curved muscle models have not been validated during dynamic exertions. Thus, the objective of this study was to investigate the fidelity of a curved muscle model during complex dynamic lifting tasks, and to investigate the changes in spine tissue loads...
August 2016: Clinical Biomechanics
https://www.readbyqxmd.com/read/27468258/post-exercise-branched-chain-amino-acid-supplementation-does-not-affect-recovery-markers-following-three-consecutive-high-intensity-resistance-training-bouts-compared-to-carbohydrate-supplementation
#14
Wesley C Kephart, Petey W Mumford, Anna E McCloskey, A Maleah Holland, Joshua J Shake, C Brooks Mobley, Adam E Jagodinsky, Wendi H Weimar, Gretchen D Oliver, Kaelin C Young, Jordan R Moon, Michael D Roberts
BACKGROUND: Amino acid supplementation has been shown to potentially reduced exercise-induced muscle soreness. Thus, the purpose of this study was to examine if branched chain amino acid and carbohydrate (BCAACHO) versus carbohydrate-only sports drink (CHO) supplementation attenuated markers of muscle damage while preserving performance markers following 3 days of intense weight training. METHODS: Healthy resistance-trained males (n = 30) performed preliminary testing (T1) whereby they: 1) donated a baseline blood draw, 2) performed knee extensor dynamometry to obtain peak quadriceps isometric and isokinetic torque as well as electromyography (EMG) activity at 60°/s and 120°/s, and 3) performed a one repetition maximum (1RM) barbell back squat...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27457913/neuromuscular-responses-to-short-term-resistance-training-with-traditional-and-daily-undulating-periodization-in-adolescent-elite-judoka
#15
Boris Ullrich, Thiemo Pelzer, Sergio Oliveira, Mark Pfeiffer
Ullrich, B, Pelzer, T, Oliveira, S, and Pfeiffer, M. Neuromuscular responses to short-term resistance training with traditional and daily undulating periodization in adolescent elite judoka. J Strength Cond Res 30(8): 2083-2099, 2016-The influence of different periodization models on neuromuscular outcomes after short-term strength training periods has not been examined in adolescent athletes. Eleven elite judoka (age: 14.8 ± 0.6 years, height: 163.2 ± 7.5 cm, body mass: 57.3 ± 11.1 kg, 5 boys/6 girls, and strength training experience: 2...
August 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27418386/physiological-aerodynamic-and-geometric-constraints-of-flapping-account-for-bird-gaits-and-bounding-and-flap-gliding-flight-strategies
#16
James Richard Usherwood
Aerodynamically economical flight is steady and level. The high-amplitude flapping and bounding flight style of many small birds departs considerably from any aerodynamic or purely mechanical optimum. Further, many large birds adopt a flap-glide flight style in cruising flight which is not consistent with purely aerodynamic economy. Here, an account is made for such strategies by noting a well-described, general, physiological cost parameter of muscle: the cost of activation. Small birds, with brief downstrokes, experience disproportionately high costs due to muscle activation for power during contraction as opposed to work...
November 7, 2016: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/27398917/full-range-of-motion-induces-greater-muscle-damage-than-partial-range-of-motion-in-elbow-flexion-exercise-with-free-weights
#17
Bruno Manfredini Baroni, Marcelo Gava Pompermayer, Anelize Cini, Amanda Stortti Peruzzolo, Régis Radaelli, Clarissa Müller Brusco, Ronei Silveira Pinto
Load and range of motion (ROM) applied in resistance training (RT) affect the muscle damage magnitude and the recovery time-course. Since exercises performed with partial ROM allow a higher load compared to those with full ROM, this study investigated the acute effect of a traditional RT exercise using full ROM or partial ROM on muscle damage markers. Fourteen healthy men performed four sets of 10 concentric-eccentric repetitions of unilateral elbow flexion at the Scott bench. Arms were randomly assigned to partial ROM (50° to 100°) and full ROM (0° to 130°) conditions, and load was determined as 80% of one repetition maximum in full and partial ROM tests...
July 7, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27341641/comparison-of-effectiveness-of-different-exercise-programs-in-treatment-of-failed-back-surgery-syndrome-a-randomized-controlled-trial
#18
Ali Yavuz Karahan, Nilay Sahin, Akın Baskent
BACKGROUND: Failed back surgery syndrome (FBSS) is a condition characterized by persistent pain following back surgeries. OBJECTIVE: To determine the effects of different exercises programs in FBSS. METHODS: A Single-blind, randomized, controlled trial designed. One hundred participants with failed back surgery syndrome were randomly assigned to three different exercises groups (Isokinetic, Dynamic lumbar stabilization (DLS), and home exercises (HE) groups) and a control group...
June 17, 2016: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/27336751/motor-evoked-potentials-in-the-lower-back-are-modulated-by-visual-perception-of-lifted-weight
#19
Frank Behrendt, Marc H E de Lussanet, Karen Zentgraf, Volker R Zschorlich
Facilitation of the primary motor cortex (M1) during the mere observation of an action is highly congruent with the observed action itself. This congruency comprises several features of the executed action such as somatotopy and temporal coding. Studies using reach-grasp-lift paradigms showed that the muscle-specific facilitation of the observer's motor system reflects the degree of grip force exerted in an observed hand action. The weight judgment of a lifted object during action observation is an easy task which is the case for hand actions as well as for lifting boxes from the ground...
2016: PloS One
https://www.readbyqxmd.com/read/27260367/the-effects-of-accumulated-muscle-fatigue-on-the-mechanomyographic-waveform-implications-for-injury-prediction
#20
D Tosovic, C Than, J M M Brown
PURPOSE: Muscle fatigue has been identified as a risk factor for spontaneous muscle injuries in sport. However, few studies have investigated the accumulated effects of muscle fatigue on human muscle contractile properties. This study aimed to determine whether repeated bouts of exercise inducing acute fatigue leads to longer-term fatigue-related changes in muscle contractile properties. METHODS: Maximum voluntary contraction (MVC), electromyographic (EMG) and mechanomyographic (MMG) measures were recorded in the biceps brachii of 11 participants for 13 days, before and after a maximally fatiguing exercise protocol...
August 2016: European Journal of Applied Physiology
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