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https://www.readbyqxmd.com/read/29324578/training-volume-not-frequency-indicative-of-maximal-strength-adaptations-to-resistance-training
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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 XX(X): 000-000, 2017-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...
October 20, 2017: 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
#7
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
#8
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 one of three resistance training groups: 1) cluster sets (CRT; n=10), 2) traditional sets (TRT: n=10), or 3) control (CON: n=10). All athletes were evaluated for thigh and arm circumference, vertical jump (VJ), 20-m sprint, 4x9-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...
October 10, 2017: 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
#9
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
#10
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
https://www.readbyqxmd.com/read/28934100/differences-in-the-movement-skills-and-physical-qualities-of-elite-senior-academy-rugby-league-players
#11
Matthew R E Ireton, Kevin Till, Dan Weaving, Ben Jones
The aim of the present study was to investigate (a) the differences in the movement skills and physical qualities between academy and senior rugby league players, and (b) the relationships between movement skills and physical qualities. Fifty-five male rugby league players (Senior, n=18; Under 19 n=23; Under 16, n=14) undertook a physical testing battery including anthropometric (stature & body mass), strength (isometric mid-thigh pull; IMTP) and power (countermovement jump; CMJ) qualities, alongside the athletic ability assessment (AAA; comprised of overhead squat, double lunge, single-leg Romanian deadlift, press-up and pull-up exercises)...
June 2, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28933716/self-rated-accuracy-of-rating-of-perceived-exertion-based-load-prescription-in-powerlifters
#12
Eric R Helms, Scott R Brown, Matt R Cross, Adam Storey, John Cronin, Michael C Zourdos
This study assessed male (n = 9) and female (n = 3) powerlifters' (18-49 years) ability to select loads using the repetitions in reserve-based rating of perceived exertion (RPE) scale for a single set for squat, bench press, and deadlift. Subjects trained 3× per week. For 3 weeks on nonconsecutive days in the weekly order of hypertrophy (8 repetitions at 8 RPE), power (2 repetitions at 8 RPE), and strength (3 repetitions at 9 RPE), using subject-selected loads intended to match the target RPE. Bench press and squat were performed every session and deadlift during strength and power only...
October 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28930932/complex-training-the-effect-of-exercise-selection-and-training-status-on-postactivation-potentiation-in-rugby-league-players
#13
David J Scott, Massimiliano Ditroilo, Phil A Marshall
This study compared the postactivation 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 10 amateur rugby league players performed 2 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% 1 repetition maximum of either HBD or BS...
October 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28930872/improving-vertical-jump-profiles-through-prescribed-movement-plans
#14
John K Mayberry, Bryce Patterson, Phil Wagner
Developing practical, reliable, and valid methods for monitoring athlete wellness and injury risk is an important goal for trainers, athletes, and coaches. Previous studies have shown that the countermovement vertical jump test (CMJ) is both a reliable and valid metric for evaluating an athlete's condition. This study examines the effectiveness of prescribed workouts on improving quality of movement during CMJ. The dataset consists of 2425 pairs of CMJ scans for high school, college, and professional athletes training at a privately owned facility...
September 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28912650/the-effects-combining-cryocompression-therapy-following-an-acute-bout-of-resistance-exercise-on-performance-and-recovery
#15
William H DuPont, Brek J Meuris, Vincent H Hardesty, Emily C Barnhart, Landon H Tompkins, Morricia J P Golden, Clayton J Usher, Paul A Spence, Lydia K Caldwell, Emily M Post, Matthew K Beeler, William J Kraemer
Compression and cold therapy used separately have shown to reduce negative effects of tissue damage. The combining compression and cold therapy (cryocompression) as a single recovery modality has yet to be fully examined. To examine the effects of cryocompression on recovery following a bout of heavy resistance exercise, recreationally resistance trained men (n =16) were recruited, matched, and randomly assigned to either a cryocompression group (CRC) or control group (CON). Testing was performed before and then immediately after exercise, 60 minutes, 24 hours, and 48 hours after a heavy resistance exercise workout (barbell back squats for 4 sets of 6 reps at 80% 1RM, 90 sec rest between sets, stiff legged deadlifts for 4 sets of 8 reps at 1...
September 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28902119/determination-of-vertical-jump-as-a-measure-of-neuromuscular-readiness-and-fatigue
#16
Casey M Watkins, Saldiam R Barillas, Megan A Wong, David C Archer, Ian J Dobbs, Robert G Lockie, Jared W Coburn, Tai T Tran, Lee E Brown
Coaches closely monitor training loads and periodize sessions throughout the season to create optimal adaptations at the proper time. However, only monitoring training loads ignores the innate physiological stress each athlete feels individually. Vertical jump (VJ) is widely used as a measure of lower body power, and has been used in post-match studies to demonstrate fatigue levels. However, no pre-training monitoring via VJ performance has been previously studied. Therefore, the purpose of this study was to determine the sensitivity of VJ as a measure of readiness and fatigue on a daily sessional basis...
September 6, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28900566/transversus-abdominis-elasticity-during-various-exercises-a-shear-wave-ultrasound-elastography-study
#17
Kuniaki Hirayama, Ryota Akagi, Yuki Moniwa, Junichi Okada, Hideyuki Takahashi
BACKGROUND: Although the transversus abdominis (TrA) is considered to play a significant role in maintaining trunk stability, there is little information regarding the type of exercise that best facilitates the development of tension in the TrA. Muscle elasticity shows a strong association with muscle tension. Shear wave ultrasound elastography provides a means by which the tension of TrA can be noninvasively estimated, by quantifying it's elasticity. PURPOSE: The purpose of this study was to examine the TrA elasticity during several exercises as measured by shear wave ultrasound elastography, and to determine which of the studied exercises demonstrated the greatest tension...
August 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28777248/inter-and-intra-rater-reliability-of-the-athletic-ability-assessment-in-sub-elite-australian-rules-football-players
#18
Daniel K Rogers, Ian McKeown, Gaynor Parfitt, Darren Burgess, Roger G Eston
The aim of this study was to determine the inter- and intra-rater rater reliability of the Athletic Ability Assessment (AAA) in sub-elite Australian Rules football (ARF) players. Eighteen male ARF players completed the AAA movement assessment (overhead squat, double lunge [left and right], single leg Romanian deadlift [left and right], chin-up and push-up), on two occasions separated by one week. During the first movement assessment players were filmed in the frontal and sagittal planes. Ten raters took part in the study (one experienced rater and nine novices) and were assigned in a quasi-random manner, to complete either (a) real-time assessment on two occasions, (b) real-time assessment on one occasion or (c) video-based assessment on two occasions...
July 31, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28752919/acute-physiological-and-perceptual-responses-to-high-load-resistance-exercise-in-hypoxia
#19
Brendan R Scott, Katie M Slattery, Dean V Sculley, Scott M Smith, Jeremiah J Peiffer, Ben J Dascombe
This study assessed whether hypoxia during high-load resistance exercise could enhance the acute physiological responses related to muscular development. Twelve trained men performed exercise in three conditions: normoxia (fraction of inspired oxygen [FI O2 ] = 21%), moderate-level hypoxia (FI O2  = 16%) and high-level hypoxia (FI O2  = 13%). Exercise comprised high-load squats and deadlifts (5 × 5 using 80% of 1-repetition maximum with 180-s rest). Muscle oxygenation and activation were monitored during exercise...
July 28, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28725437/towards-evidence-based-strength-training-a-comparison-of-muscle-forces-during-deadlifts-goodmornings-and-split-squats
#20
Florian Schellenberg, William R Taylor, Silvio Lorenzetti
BACKGROUND: To ensure an efficient and targeted adaptation with low injury risk during strength exercises, knowledge of the participant specific internal loading conditions is essential. The goal of this study was to calculate the lower limb muscles forces during the strength exercises deadlifts, goodmornings and splits squats by means of musculoskeletal simulation. METHODS: 11 participants were assessed performing 10 different variations of split squats by varying the step length as well as the maximal frontal tibia angle, and 13 participants were measured performing deadlift and goodmorning exercises...
2017: BMC Sports Science, Medicine and Rehabilitation
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