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https://www.readbyqxmd.com/read/29688093/impact-of-accommodating-resistance-in-potentiating-horizontal-jump-performance-in-professional-rugby-league-players
#1
Alasdair Strokosch, Loic Louit, Laurent Seitz, Richard Clarke, Jonathan D Hughes
This study investigated the efficacy of deadlifts and box squats, with a combination of traditional and accommodating resistance, as a potentiating (PAP) stimulus of standing broad jumps (SBJ) in a multiple set contrast protocol. Twelve professional rugby league players (21.4 ± 2.5yrs; 181.3 ± 8.3cm, 91.9 ± 8.8kg; 1RM back squat/BM 1.59 ± 0.21; 1RM deadlift/BM 2.11 ± 0.25; ≥3 years resistance training experience) performed baseline SBJ before a contrast PAP protocol involving 2 repetitions of 85% 1RM box squat or deadlifts, loaded with a combination of traditional barbell weight (70% 1RM) and elastic band resistance (~15% 1RM), followed by two SBJs...
April 24, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29511655/comparison-of-isokinetic-trunk-flexion-and-extension-torques-and-powers-between-athletes-and-nonathletes
#2
Amira Ben Moussa Zouita, Fatma Zohra Ben Salah, Catherine Dziri, Chris Beardsley
This study is aimed to perform and compare maximal concentric isokinetic trunk extension and flexion torques and powers between high-level athletes and a control population. In addition, the ratio of isokinetic trunk extension and flexion torques was measured, and compared between groups. Eighteen high-level male athletes and 15 male nonathletes without low back pain were recruited. Subjects performed isokinetic trunk extension and flexion at 60°/sec, 90°/sec, and 120°/sec through a maximal range of motion in a dynamometer...
February 2018: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/29489730/a-biomechanical-analysis-of-the-effects-of-bouncing-the-barbell-in-the-conventional-deadlift
#3
Kellen Krajewski, Robert LeFavi, Bryan Riemann
The purpose of this study is to analyze biomechanical differences between the bounce and pause styles of deadlifting. Twenty physically active males performed deadlifts at their 75% one repetition maximum testing utilizing both pause and bounce techniques in a within-subjects randomized study design. The average peak height the barbell attained from the three bounce style repetitions was used to compute a compatible phase for analysis of the pause style repetitions. Net joint moment impulse (NJMI), work, average vertical ground reaction force (vGRF), vGRF impulse and phase time were computed for two phases, lift off to peak barbell height and the entire ascent...
February 27, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29466270/validity-and-reliability-of-the-load-velocity-relationship-to-predict-the-one-repetition-maximum-in-deadlift
#4
Ludwig Ruf, Clément Chéry, Kristie-Lee Taylor
Ruf, L, Chéry, C, Taylor, KL. Validity and reliability of the load-velocity relationship to predict the 1RM in deadlift. J Strength Cond Res 32(3): 681-689, 2018-The aim of this study was to verify the reliability and validity of using submaximal loads from the load-velocity relationship to predict the actual 1 repetition maximum (1RM) in the deadlift. Data from 11 resistance-trained athletes were analyzed performing three 1RM assessments separated by at least 3 days. Reliability was assessed by comparing predicted 1RMs of sessions 2 and 3, whereas for validity purposes, predicted 1RMs of session 3 were compared with actual 1RMs of session 2...
March 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29465608/muscle-activation-patterns-of-lower-body-musculature-among-three-traditional-lower-body-exercises-in-trained-women
#5
Max R Paquette, Dana K Fuller, Jennifer L Caputo, John M Coons
The deadlift and back and front squats are common multi-joint, lower body resistance exercises that target similar musculature. To our knowledge, muscle activity measured via surface electromyography (EMG) has never been analyzed among these three exercises. Furthermore, most literature examining this topic has included male participants creating a void in the literature for the female population. Knowledge of lower body muscle activation among these three exercises can aid coaches, trainers, and therapists for training and rehabilitative purposes...
February 15, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29461422/eight-weeks-of-strength-and-power-training-improves-club-head-speed-in-collegiate-golfers
#6
Dustin J Oranchuk, Jason M Mannerberg, Tracey L Robinson, Megan C Nelson
Club head speed (CHS) is a major determinant of drive distance, a key component of golf performance. The purpose of this study was to determine the indirect effects of an eight-week strength and power program on CHS. Twelve (6 male, 6 female) NCAA Division II golfers (20.3±1.5 years) randomly assigned to an intervention or control group, underwent either a periodized strength and power program consisting of high-load barbell movements or a bodyweight and rotational movement focused resistance training program...
February 14, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29401203/the-effect-of-accommodating-resistance-on-the-post-activation-potentiation-response-in-rugby-league-players
#7
David J Scott, Massimiliano Ditroilo, Phil Marshall
This study examined the post-activation potentiation (PAP) response of two conditioning activities (CA), the hexbar deadlift (HBD) and back squat (BS), combined with accommodating resistance; this adds a percentage of the total resistance during the exercise. Twenty amateur rugby league players performed two experimental trials and a control trial without a CA. Participants performed a countermovement jump (CMJ) before and 30, 90, and 180 seconds after one set of three repetitions of each CA at 70% 1 repetition maximum (RM), with up to an additional 23% 1RM from accommodating resistance...
February 1, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29386171/a-wearable-sensor-based-exercise-biofeedback-system-mixed-methods-evaluation-of-formulift
#8
Martin Aidan O'Reilly, Patrick Slevin, Tomas Ward, Brian Caulfield
BACKGROUND: Formulift is a newly developed mobile health (mHealth) app that connects to a single inertial measurement unit (IMU) worn on the left thigh. The IMU captures users' movements as they exercise, and the app analyzes the data to count repetitions in real time and classify users' exercise technique. The app also offers feedback and guidance to users on exercising safely and effectively. OBJECTIVE: The aim of this study was to assess the Formulift system with three different and realistic types of potential users (beginner gym-goers, experienced gym-goers, and qualified strength and conditioning [S&C] coaches) under a number of categories: (1) usability, (2) functionality, (3) the perceived impact of the system, and (4) the subjective quality of the system...
January 31, 2018: JMIR MHealth and UHealth
https://www.readbyqxmd.com/read/29373426/tapering-practices-of-strongman-athletes
#9
Paul W Winwood, Mike K Dudson, Daniel Wilson, Justice K H Mclaren-Harrison, Vladislav Redjkins, Hayden J Pritchard, Justin W L Keogh
Winwood, PW, Dudson, MK, Wilson, D, Mclaren-Harrison, JKH, Redjkins, V, Pritchard, HJ, and Keogh, JWL. Tapering practices of strongman athletes. J Strength Cond Res 32(5): 1181-1196, 2018-This study provides the first empirical evidence of how strongman athletes taper for strongman competitions. Strongman athletes (n = 454) (mean ± SD: 33.2 ± 8.0 years, 178.1 ± 10.6 cm, 108.6 ± 27.9 kg, 12.6 ± 8.9 years general resistance training, 5.3 ± 5.0 years strongman implement training) completed a self-reported 4-page internet survey on tapering practices...
May 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29369954/short-term-training-cessation-as-a-method-of-tapering-to-improve-maximal-strength
#10
Hayden J Pritchard, Matthew J Barnes, Robin J C Stewart, Justin W L Keogh, Michael R McGuigan
Pritchard, HJ, Barnes, MJ, Stewart, RJC, Keogh, JWL, and McGuigan, MR. Short-term training cessation as a method of tapering to improve maximal strength. J Strength Cond Res 32(2): 458-465, 2018-The aim of this study was to determine the effects of 2 different durations of training cessation on upper- and lower-body maximal strength performance and to investigate the mechanisms underlying performance changes following short-term training cessation. Eight resistance trained males (23.8 ± 5.4 years, 79.6 ± 10...
February 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29324578/training-volume-not-frequency-indicative-of-maximal-strength-adaptations-to-resistance-training
#11
Ryan J Colquhoun, Christopher M Gai, Danielle Aguilar, Daniel Bove, Jeffrey Dolan, Andres Vargas, Kaylee Couvillion, Nathaniel D M Jenkins, Bill I Campbell
PURPOSE: To compare the effects of a high- versus a moderate-training frequency on maximal strength and body composition. METHODS: 28 young, healthy resistance-trained males were randomly assigned to either: 3x/week (3x; n=16) or 6x/week (6x; n=12). Dependent variables (DVs) assessed at baseline and after the 6-week training intervention included: squat 1RM (SQ1RM), bench press 1RM (BP1RM), deadlift 1RM (DL1RM), powerlifting total (PLT), Wilk's coefficient (WC), fat-free mass (FFM) and fat mass (FM)...
January 5, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29283928/maximal-upper-body-strength-and-oxygen-uptake-are-associated-with-performance-in-high-level-200-m-sprint-kayakers
#12
Craig W Pickett, Kazunori Nosaka, James Zois, Will G Hopkins, Anthony J, Blazevich
Current training and monitoring methods in sprint kayaking are based on the premise that upper-body muscular strength and aerobic power are both important for performance, but limited evidence exists to support this premise in high-level athletes. Relationships between measures of strength, maximal oxygen uptake (VO2max) and 200-m race times in kayakers competing at national-to-international levels were examined. Data collected from Australian Canoeing training camps and competitions for 7 elite, 7 national and 8 club level male sprint kayakers were analyzed for relationships between maximal isoinertial strength (3-RM bench press, bench row, chin-up and deadlift), VO2max on a kayak ergometer, and 200-m race time...
December 27, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29239993/hypoxia-during-resistance-exercise-does-not-affect-physical-performance-perceptual-responses-or-neuromuscular-recovery
#13
Brendan R Scott, Katie M Slattery, Dean V Sculley, Ben J Dascombe
This study aimed to determine whether performing resistance exercise in hypoxia affects markers of physical performance, perceptual responses, and neuromuscular function. Fourteen male subjects (age: 24.6 ± 2.7 yr; height: 179.7 ± 5.9 cm; body mass: 84.6 ± 11.6 kg) with >2 years resistance training experience performed moderate-load resistance exercise in two conditions; normoxia (FIO2 = 0.21) and hypoxia (FIO2 = 0.16). Resistance exercise comprised 3 sets of 10 repetitions of back squats and deadlifts at 60% of 1RM, with 60s inter-set rest...
December 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29143379/region-dependent-hamstrings-activity-in-nordic-hamstring-exercise-and-stiff-leg-deadlift-defined-with-high-density-emg
#14
András Hegyi, Annamária Péter, Taija Finni, Neil J Cronin
Recent studies suggest region-specific metabolic activity in hamstring muscles during injury prevention exercises, but the neural representation of this phenomenon is unknown. The aim of this study was to examine whether regional differences are evident in the activity of biceps femoris long head (BFlh) and semitendinosus (ST) muscles during two common injury prevention exercises. Twelve male participants without a history of hamstring injury performed the Nordic hamstring exercise (NHE) and stiff-leg deadlift (SDL) while BFlh and ST activity were recorded with high-density electromyography (HD-EMG)...
November 15, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29129132/reliability-of-force-velocity-relationships-during-deadlift-high-pull
#15
Wei Lu, Sébastien Boyas, Marc Jubeau, Abderrahmane Rahmani
This study aimed to evaluate the within- and between-session reliability of force, velocity and power performances and to assess the force-velocity relationship during the deadlift high pull (DHP). Nine participants performed two identical sessions of DHP with loads ranging from 30 to 70% of body mass. The force was measured by a force plate under the participants' feet. The velocity of the 'body + lifted mass' system was calculated by integrating the acceleration and the power was calculated as the product of force and velocity...
November 13, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/29076958/gluteus-maximus-and-hamstring-activation-during-selected-weight-bearing-resistance-exercises
#16
Kevin McCurdy, John Walker, Derrick Yuen
McCurdy, K, Walker, J, and Yuen, D. Gluteus maximus and hamstring activation during selected weight-bearing resistance exercises. J Strength Cond Res 32(3): 594-601, 2018-The purpose of this study was to compare the gluteus maximus (GM) and hamstring group (HG) electromyographic (EMG) activation levels among selected weight-bearing resistance exercises. Eighteen young adult females with previous resistance training experience completed the study. Strength was assessed on the bilateral squat (BS) (3 repetition maximum [RM]), modified single-leg squat (MSLS) (3RM), and stiff-leg deadlift (SLDL) (8RM) to determine an 8RM load for all lifts...
March 2018: Journal of Strength and Conditioning Research
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
#17
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/29017017/the-effect-of-resistance-training-set-configuration-on-strength-power-and-hormonal-adaptation-in-female-volleyball-players
#18
Hamid Arazi, Aida Khanmohammadi, Abbas Asadi, G Gregory Haff
The primary purpose of this investigation was to determine the impact of altering the set structure during an 8-week resistance training program on anthropometric, hormonal, and strength power characteristics. Thirty female volleyball players were recruited for participation and then randomly assigned to 1 of 3 resistance training groups: (i) cluster sets (CRT; n = 10), (ii) traditional sets (TRT; n = 10), or (iii) control (CON; n = 10). All athletes were evaluated for thigh and arm circumference, vertical jump, 20-m sprint, 4 × 9-m shuttle-run, 1-repetition maximum (1RM) back squat, bench press, military press, and deadlift prior to and after an 8-week periodized training intervention...
February 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29016477/shod-versus-barefoot-effects-on-force-and-power-development-during-a-conventional-deadlift
#19
Mark E Hammer, Rudi A Meir, John W Whitting, Zachary J Crowley-McHattan
The kinetics of a conventional deadlift in shod (S) versus unshod (US) footwear conditions in 10 male participants (mean ± SD, age = 27.0 ± 5.8 years; weight = 78.7 ± 11.5 kg; height = 175.8 ± 8.2 cm; 1RM deadlift = 155.8 ± 25.8 kg) was assessed in two testing sessions. A counterbalanced, crossover experimental design was used with different loads (60% and 80% 1RM). Four sets of four repetitions were prescribed per session with two sets per shoe and with each shoe condition involving one set per load. Peak vertical force (PF), rate of force development (RFD), time to peak force (TPF), anterior-posterior (COP-AP) and medio-lateral (COP-ML) center of pressure excursion, and barbell peak power (PP) data were recorded during all repetitions...
October 7, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29016475/relationship-between-physiological-off-ice-testing-on-ice-skating-and-game-performance-in-division-i-women-s-ice-hockey-players
#20
Michelle Boland, Emily M Miele, Katie Delude
The purpose was to identify off-ice testing variables that correlate to skating and game performance in Division I collegiate women ice hockey players. Twenty female, forward and defensive players (19.95 ± 1.35 yr) were assessed for weight, height, percent fat mass (%FAT), bone mineral density, predicted one repetition maximum (RM) absolute and relative (REL%) bench press (BP) and hex bar deadlift (HDL), lower body explosive power, anaerobic power, countermovement vertical jump (CMJ), maximum inspiratory pressure (MIP), and on-ice repeated skate sprint (RSS) performance...
October 7, 2017: Journal of Strength and Conditioning Research
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