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https://www.readbyqxmd.com/read/27893479/complex-training-the-effect-of-exercise-selection-and-training-status-on-post-activation-potentiation-in-rugby-league-players
#1
David J Scott, Massimiliano Ditroilo, Phil Marshall
This study compared the post-activation potentiation (PAP) response of the hex bar deadlift (HBD) and back squat (BS) exercises. The PAP response between different levels of athletes was also compared. Ten professional and ten amateur rugby league players performed two experimental sessions. Participants performed a countermovement jump (CMJ) before and 2, 4, 6, 8, 10, 12, 14 and 16 minutes after a conditioning activity (CA) that contained 1 set of 3 repetitions at 93% 1RM of either HBD or BS. A force platform determined peak power output (PPO), force at PPO, velocity at PPO and jump height of each CMJ...
November 16, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27893477/an-evaluation-of-agonist-antagonist-strength-ratios-and-posture-among-powerlifters
#2
Paul T Cutrufello, Stephen J Gadomski, Nicholas A Ratamess
Powerlifters routinely focus on three exercises: bench press, squat, and deadlift. This focus may predispose them to the development of muscle imbalances in either the upper or lower extremity which might also influence posture. Therefore, the purpose of the present study was to examine the agonist:antagonist strength ratios and their relationship to postural measures among powerlifters. An expost facto study design compared fifteen male powerlifters (35.3±13.7 years old) and fifteen age-matched controls (34...
November 16, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27893476/comparison-of-muscle-involvement-and-posture-between-the-conventional-deadlift-and-a-walk-in-style-deadlift-machine
#3
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/27870804/the-effects-of-low-load-motor-control-exercises-and-a-high-load-lifting-exercise-on-lumbar-multifidus-thickness-a-randomized-controlled-trial
#4
Lars Berglund, Björn Aasa, Peter Michaelson, Ulrika Aasa
STUDY DESIGN: Randomized controlled trial OBJECTIVE.: The aim of this study was to compare the effects of low-load motor control exercises and a high-load lifting exercise, on lumbar multifidus (LM) thickness on either side of the spine and whether the effects are affected by pain intensity or change in pain intensity, among patients with nociceptive mechanical LBP. SUMMARY OF BACKGROUND DATA: There is evidence that patients with low back pain may have a decreased size of the (LM) muscles with an asymmetry between sides in the lower back...
November 18, 2016: Spine
https://www.readbyqxmd.com/read/27806012/acute-effects-of-plyometric-and-resistance-training-on-running-economy-in-trained-runners
#5
Richard T Marcello, Beau Kjerulf Greer, Anna E Greer
Results regarding the acute effects of plyometric and resistance training (PRT) on running economy (RE) are conflicting. Eight male collegiate distance runners (21 ± 1 years, 62.5 ± 7.8 ml/kg/min V[Combining Dot Above]O2 peak) completed V[Combining Dot Above]O2 peak and 1 repetition maximum (1RM) testing. Seven days later, subjects completed a 12 minute RE test at 60% and 80% V[Combining Dot Above]O2 peak, followed by a PRT protocol or a rested condition of equal duration (CON). The PRT protocol consisted of 3 sets of 5 repetitions at 85% 1RM for barbell squats, Romanian deadlifts, and barbell lunges; the same volume was utilized for resisted lateral lunges, box jumps, and depth jumps...
October 28, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27806009/tapering-practices-of-croatian-open-class-powerlifting-champions
#6
Jozo Grgic, Pavle Mikulic
The aim of this study was to explore tapering practices among 10 Croatian open-class powerlifting champions (mean ± SD: age 29.2 ± 3.2 years; Wilks coefficient 355.1 ± 54.8). The athletes were interviewed about their tapering practices using a semi-structured interview, after which the audio content was transcribed. The athletes reported decreasing training volume during the taper by 50.5 ± 11.7% using a step type or an exponential type of taper with a fast decay. Training intensity was maintained or increased during the taper, and it reached its highest values 8 ± 3 days before the competition...
October 27, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27803635/discriminating-talent-identified-junior-australian-footballers-using-a-fundamental-gross-athletic-movement-assessment
#7
Carl T Woods, Harry G Banyard, Ian McKeown, Job Fransen, Sam Robertson
Talent identification (TID) is a pertinent component of the sports sciences, affording practitioners the opportunity to target developmental interventions to a select few; optimising financial investments. However, TID is multi-componential, requiring the recognition of immediate and prospective performance. The measurement of athletic movement skill may afford practitioners insight into the latter component given its augmented relationship with functional sport specific qualities. It is currently unknown whether athletic movement skill is a discriminant quality in junior Australian football (AF)...
September 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27766131/eight-weeks-of-kettlebell-swing-training-does-not-improve-sprint-performance-in-recreationally-active-females
#8
Michael E Holmstrup, Brock T Jensen, William S Evans, Emily C Marshall
The kettlebell swing (KBS), emphasizing cyclical, explosive hip extension in the horizontal plane, aligns with movement- and velocity-specificity of sprinting. The present study examined the effect of an eight-week KBS intervention on sprinting in recreationally-active females, in comparison to an eight-week intervention using the stiff-legged deadlift (SDL). Following a pre-testing session measuring 30 meter sprint and countermovement vertical jump performance, participants were divided evenly by sprint time into KBS (n=8) and SDL (n=10) cohorts...
2016: International Journal of Exercise Science
https://www.readbyqxmd.com/read/27762041/acute-resistance-exercise-using-free-weights-on-aortic-wave-reflection-characteristics
#9
Yu Lun Tai, Hayden Gerhart, Xián Mayo, J Derek Kingsley
Aortic wave reflection characteristics such as the augmentation index (AIx), wasted left ventricular pressure energy (ΔEw ) and aortic haemodynamics, such as aortic systolic blood pressure (ASBP), strongly predict cardiovascular events. The effects of acute resistance exercise (ARE) using free-weight exercises on these characteristics are unknown. Therefore, we sought to determine the effects of acute free-weight resistance exercise on aortic wave reflection characteristics and aortic haemodynamics in resistance-trained individuals...
October 19, 2016: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/27662491/acute-physiological-responses-to-moderate-load-resistance-exercise-in-hypoxia
#10
Brendan R Scott, Katie M Slattery, Dean V Sculley, Catriona Lockhart, Ben J Dascombe
This study assessed whether hypoxia augments anabolic responses to moderate-load resistance exercise. Fourteen trained males performed moderate-load resistance exercise in normoxia (NORM; fraction of inspired oxygen [FIO2] = 21%) and moderate-level hypoxia (MH; FIO2 = 16%). Exercise comprised 3 sets of 10 repetitions of squats and deadlifts at 60% of 1-repetition maximum, with 60 s inter-set rest. Blood lactate (BLa) was quantified after each exercise, while arterial oxygen saturation (SpO2) and heart rate (HR) were assessed following each set...
September 20, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27600146/the-sticking-point-in-the-bench-press-the-squat-and-the-deadlift-similarities-and-differences-and-their-significance-for-research-and-practice
#11
Justin Kompf, Ognjen Arandjelović
Since it was first observed, and especially so in recent years, the phenomenon of the so-called "sticking point" in resistance training has attracted a substantial amount of sports and exercise science research. Broadly speaking, the sticking point is understood as the position in the range of motion of a lift at which a disproportionately large increase in the difficulty associated with continuing the lift is experienced. Hence the sticking point is inherently the performance bottleneck, and is also associated with an increased chance of exercise form deterioration or breakdown...
September 6, 2016: Sports Medicine
https://www.readbyqxmd.com/read/27583444/mri-based-regional-muscle-use-during-hamstring-strengthening-exercises-in-elite-soccer-players
#12
Alberto Mendez-Villanueva, Luis Suarez-Arrones, Gil Rodas, Rodrigo Fernandez-Gonzalo, Per Tesch, Richard Linnehan, Richard Kreider, Valter Di Salvo
The present study examined site-specific hamstring muscles use with functional magnetic resonance imaging (MRI) in elite soccer players during strength training. Thirty-six players were randomized into four groups, each performing either Nordic hamstring, flywheel leg-curl, Russian belt or the hip-extension conic-pulley exercise. The transverse relaxation time (T2) shift from pre- to post-MRI were calculated for the biceps femoris long (BFl) and short (BFs) heads, semitendinosus (ST) and semimembranosus (SM) muscles at proximal, middle and distal areas of the muscle length...
2016: PloS One
https://www.readbyqxmd.com/read/27548797/isometric-mid-thigh-pull-reliability-and-relationship-to-deadlift-1rm
#13
John K De Witt, Kirk L English, J Brent Crowell, Kent L Kalogera, Mark E Guilliams, Bruce E Nieschwitz, Andrea M Hanson, Lori L Ploutz-Snyder
PURPOSE: The purpose of this investigation was to examine the reliability of the isometric mid-thigh pull (IMTP) and the relationship between IMTP peak force and deadlift 1 repetition maximum (1RM). METHODS: Nine subjects (5 m/4 f; 40.6 ± 8.0 yr; 1.72 ± 0.10 m; 75.6 ± 13.4 kg) participated in this study. IMTP and deadlift 1RM were both performed during 2 testing sessions. For IMTP, peak force and peak rate of force development (RFD) were determined, in addition to RFD at 30 ms, 50 ms, 90 ms, 150 ms, 200 ms, and 250 ms after initiation of the pull...
August 18, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27441933/knee-extensor-mechanism-repairs-standard-suture-repair-and-novel-augmentation-technique
#14
Zachary Meyer, William M Ricci
Patellar and quadriceps tendon ruptures are relatively common injuries. Rupture of the knee extensor mechanism may occur because of a forceful eccentric contraction of the quadriceps against a resisted flexed knee, though atraumatic cases have also been described. Patients at higher than normal risk for knee extensor mechanism rupture include those with systemic co-morbidities, fluoroquinolone use, and chronic tendinopathy. Early operative treatment and mobilization of acute extensor mechanism ruptures has proven effective, and numerous techniques have been described...
August 2016: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/27430755/ancient-peat-and-apple-extracts-supplementation-may-improve-strength-and-power-adaptations-in-resistance-trained-men
#15
Jordan M Joy, Roxanne M Vogel, Jordan R Moon, Paul H Falcone, Matt M Mosman, Zbigniew Pietrzkowski, Tania Reyes, Michael P Kim
BACKGROUND: Increased cellular ATP levels have the potential to enhance athletic performance. A proprietary blend of ancient peat and apple extracts has been supposed to increase ATP production. Therefore, the purpose of this investigation was to determine the effects of this supplement on athletic performance when used during 12 weeks of supervised, periodized resistance training. METHODS: Twenty-five healthy, resistance-trained, male subjects completed this study...
2016: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/27408480/examination-of-a-lumbar-spine-biomechanical-model-for-assessing-axial-compression-shear-and-bending-moment-using-selected-olympic-lifts
#16
Moataz Eltoukhy, Francesco Travascio, Shihab Asfour, Shady Elmasry, Hector Heredia-Vargas, Joseph Signorile
BACKGROUND/AIMS: Loading during concurrent bending and compression associated with deadlift, hang clean and hang snatch lifts carries the potential for injury to the intervertebral discs, muscles and ligaments. This study examined the capacity of a newly developed spinal model to compute shear and compressive forces, and bending moments in lumbar spine for each lift. METHODS: Five male subjects participated in the study. The spine was modeled as a chain of rigid bodies (vertebrae) connected via the intervertebral discs...
September 2016: Journal of Orthopaedics
https://www.readbyqxmd.com/read/27361832/comparison-of-hex-bar-deadlift-vs-back-squat-postactivation-potentiation-on-vertical-jump-takeoff-velocity-3263-board-328-june-3-3-30-pm-5-00-pm
#17
Cameron N Munger, Whitney D Leyva, David C Archer, Andrew J Galpin, Jared W Coburn, Lee E Brown
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27361019/effects-of-barbell-bouncing-on-joint-kinematics-in-deadlifts-2194-board-346-june-2-2-00-pm-3-30-pm
#18
Kellen Krajewski, Robert G LeFavi, Bryan L Riemann
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27360607/an-examination-of-muscle-activation-and-power-characteristics-while-performing-the-deadlift-exercise-with-straight-and-hexagonal-barbells-1688-board-341-june-2-9-00-am-10-30-am
#19
Kevin D Camara, Jared W Coburn, Dustin D Dunnick, Lee E Brown, Andrew J Galpin, Pablo B Costa
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27360500/correlation-between-isometric-deadlift-with-olympic-and-hexagonal-barbells-to-a-vertical-jump-1581-board-234-june-2-9-00-am-10-30-am
#20
RoQue A Harmon, Kylie K Malyszek, Dustin D Dunnick, Pablo B Costa, Jared W Coburn, Lee E Brown
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
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