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https://www.readbyqxmd.com/read/28282743/can-changes-in-resistance-exercise-workload-influence-internal-load-countermovement-jump-performance-and-the-endocrine-response
#1
Daniel J Hiscock, Brian Dawson, Michael Clarke, Peter Peeling
This study examined the influence of differing volume load and intensity (%1 repetition maximum[%1RM]) resistance exercise workouts on session rating of perceived exertion (sRPE) countermovement jump (CMJ) performance and endocrine responses. Twelve participants performed a workout comprising four exercises (bench press, back squat, deadlift and prone bench pull) in randomised order as either power (POW); 3 sets × 6 repetitions at 45%1RM × 3 min inter-set rest, strength (ST); 3 sets × 3 repetitions at 90%1RM × 3 min inter-set rest, or hypertrophy (HYP); 3 sets × 10 repetitions at 70%1RM × 1 min inter-set rest in a randomised-crossover design...
February 23, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28260202/biochemical-responses-and-physical-performance-during-high-intensity-resistance-circuit-training-in-hypoxia-and-normoxia
#2
Domingo J Ramos-Campo, Jacobo A Rubio-Arias, Stéphane Dufour, Linda Chung, Vicente Ávila-Gandía, Pedro E Alcaraz
PURPOSE: The aim of this study was to analyze the effect of hypoxia on metabolic and acid-base balance, blood oxygenation, electrolyte, and half-squat performance variables during high-resistance circuit (HRC) training. METHODS: Twelve resistance-trained subjects participated in this study. After a 6RM testing session, participants performed three randomized trials of HRC: normoxia (NORM: FiO2 = 0.21), moderate hypoxia (MH: FiO2 = 0.16), or high hypoxia (HH: FiO2 = 0...
March 4, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28217416/the-intra-and-inter-rater-reliability-of-the-soccer-injury-movement-screen-sims
#3
Robert McCunn, Karen Aus der Fünten, Andrew Govus, Ross Julian, Jan Schimpchen, Tim Meyer
BACKGROUND/PURPOSE: The growing volume of movement screening research reveals a belief among practitioners and researchers alike that movement quality may have an association with injury risk. However, existing movement screening tools have not considered the sport-specific movement and injury patterns relevant to soccer. The present study introduces the Soccer Injury Movement Screen (SIMS), which has been designed specifically for use within soccer. Furthermore, the purpose of the present study was to assess the intra- and inter-rater reliability of the SIMS and determine its suitability for use in further research...
February 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28195977/fat-grip-resistance-training-improves-driving-performance-in-division-i-male-golfers
#4
Patrick M Cummings, Hunter S Waldman, Ben M Krings, JohnEric W Smith, Matthew J McAllister
Fat Grip (FG) training is implemented into strength and conditioning programs with the overall goal of increasing grip strength. Previous research assessing the effect of training with increased grip diameters compared to standard Olympic bar diameters has mainly been in acute settings. Therefore, the purpose of this study was to examine to effects FG training compared to normal diameter grip (CON) training during an eight week periodized resistance training (RT) program in Division I male golfers. Subjects (n = 10) were randomly assigned into two groups: the FG group (n = 5, scoring average: 75...
February 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28195976/self-reported-measures-of-strength-and-sport-specific-skills-distinguish-ranking-in-an-international-online-fitness-competition
#5
Paul R Serafini, Yuri Feito, Gerald T Mangine
To determine if self-reported performance measures could distinguish ranking during the 2016 CrossFit Open, data from three thousand male (n=1500; 27.2±8.4 y; 85.2±7.9 kg; 177.0±6.5 cm) and female (n=1500, 28.7±4.9 y; 63.7±5.8 kg; 163.7±6.6 cm) competitors was used for this study. Competitors were split by gender and grouped into quintiles (Q1-Q5) based upon their final ranking. Quintiles were compared for one-repetition maximum (1RM) squat, deadlift, clean and jerk (CJ), snatch, 400-m sprint, 5,000-m run, and benchmark workouts (Fran, Helen, Grace, Filthy-50, and Fight-gone-bad)...
February 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28177725/effects-of-phosphatidic-acid-supplementation-on-muscle-thickness-and-strength-in-resistance-trained-men
#6
Adam M Gonzalez, Katie M Sell, Jamie J Ghigiarelli, Christopher F Kelly, Edward W Shone, Matthew R Accetta, Jamie B Baum, Gerald T Mangine
The purpose of this study was to investigate the effects of phosphatidic acid (PA) supplementation on muscle thickness and strength following an 8 week supervised resistance-training program. Fifteen resistance trained men (22.8 ± 3.5 years; 80.6 ± 8.7 kg; 178.1 ± 5.6 cm; 14.6% ± 8.8% body fat) were randomly assigned to a group that either consumed 750 mg of PA or a placebo (PL). Testing was carried out before (PRE) and after (POST) training/supplementation for muscle thickness and strength. Muscle thickness of the rectus femoris (RF), vastus lateralis (VL), biceps brachii (BB), and triceps brachii (TB) muscles were measured via ultrasonography, along with 1 repetition maximum (1RM) of squat, deadlift, and bench press...
January 5, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28151780/electromyographic-comparison-of-barbell-deadlift-hex-bar-deadlift-and-hip-thrust-exercises-a-cross-over-study
#7
Vidar Andersen, Marius Steiro Fimland, Dag-Andrè Mo, Vegard Moe Iversen, Torbjørn Vederhus, Lars Richard Rockland Hellebø, Kristina Isabel Nordaune, Atle Hole Saeterbakken
The aim of the study was to compare the muscle activation level of the gluteus maximus, biceps femoris and erector spinae in the hip thrust, barbell deadlift and hex bar deadlift; each of which are compound resisted hip-extension exercises. After two familiarization sessions, 13 resistance-trained men performed a 1-RM in all three exercises in one session, in randomized and counterbalanced order. The whole ascending movement (concentric phase), as well as its lower and upper part (whole movement divided in two), were analyzed...
January 30, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28129275/comparison-of-powerlifting-performance-in-trained-men-using-traditional-and-flexible-daily-undulating-periodization
#8
Ryan J Colquhoun, Christopher M Gai, Jeoffrey Walters, Andrew R Brannon, Marcus W Kilpatrick, Dominic P DʼAgostino, William I Campbell
Colquhoun, RJ, Gai, CM, Walters, J, Brannon, AR, Kilpatrick, MW, D'Agostino, DP, and Campbell, WI. Comparison of powerlifting performance in trained men using traditional and flexible daily undulating periodization. J Strength Cond Res 31(2): 283-291, 2017-Daily undulating periodization (DUP) is a growing trend, both in practice and in the scientific literature. A new form of DUP, flexible daily undulating periodization (FDUP), allows for athletes to have some autonomy by choosing the order of their training...
February 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27928217/effects-of-a-high-protein-and-omega-3-enriched-diet-with-or-without-creatine-supplementation-on-markers-of-soreness-and-inflammation-during-5-consecutive-days-of-high-volume-resistance-exercise-in-females
#9
Sara Hayward, Colin D Wilborn, Lem W Taylor, Stacie L Urbina, Jordan J Outlaw, Cliffa A Foster, Michael D Roberts
We examined if two different dietary interventions affected markers of soreness and inflammation over a 5-day high-volume resistance training protocol in females that resistance-trained 8 weeks prior. Twenty-eight females (age: 20 ± 1 yr; body mass: 63.5 ± 1.6 kg, height: 1.67 ± 0.01 m) completed 4 weeks of pre-training (weeks 1-4) followed by a subsequent 4-week training period along with a dietary intervention (weeks 5-8). Dietary interventions from weeks 5-8 included: a) no intervention (CTL, n = 10) b) a higher-protein diet supplemented with hydrolyzed whey protein (50 g/d) and omega-3 fatty acids (900 mg/d) (DI, n = 8), and c) the DI condition as well as creatine monohydrate (5 g/d) (DI+C, n = 10)...
December 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27893479/complex-training-the-effect-of-exercise-selection-and-training-status-on-post-activation-potentiation-in-rugby-league-players
#10
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
#11
Paul T Cutrufello, Stephen J Gadomski, Nicholas A Ratamess
Cutrufello, PT, Gadomski, SJ, and Ratamess, NA. An evaluation of agonist:antagonist strength ratios and posture among powerlifters. J Strength Cond Res 31(2): 298-304, 2017-Powerlifters routinely focus on 3 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...
February 2017: 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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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...
April 2017: Sports Medicine
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