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https://www.readbyqxmd.com/read/29709717/nonlinear-analysis-is-the-most-suitable-method-to-detect-changes-in-heart-autonomic-control-after-exercise-of-different-durations
#1
Rogério Figueiredo, Rafael Pereira, Osmar Pinto Neto
This study aimed to compare the heart autonomic control (HAC) response during two time-limited physical workouts using linear and nonlinear methods. A total of 20 healthy volunteers performed two physical workouts lasting 5 (P5) and 10 min (P10). In both workouts, volunteers performed as many repetitions as possible within the time limit of sets of 10 repetitions of four different exercises in the order of pull-ups, push-ups, barbell power clean, and barbell shoulder to overhead press. Barbell exercises were performed using a load of 50% of each volunteer's personal record for the jerk lift...
April 16, 2018: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/29547489/the-impact-of-power-clean-ability-and-training-age-on-adaptations-to-weightlifting-style-training
#2
Lachlan P James, Paul Comfort, Timothy J Suchomel, Vincent G Kelly, Emma M Beckman, G Gregory Haff
The purpose of this investigation was to determine whether weightlifting actions are a viable method for improving athletic performance amongst weaker, inexperienced lifters when compared to individuals with a greater power clean result, and hence weightlifting ability and experience. Two groups of males with distinctly different power clean performances (higher performance (HP): N = 8; BM = 78.1±4.0 kg; 1RM PC = 1.08±0.09 kgBM; lower performance (LP): N = 8; BM=82.6±14.0 kg; 1RM PC=0.78±0.1 kg·BM) and resistance training age (HP: resistance training experience=3...
March 14, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29533357/predicting-bobsled-pushing-ability-from-various-combine-testing-events
#3
Curtis L Tomasevicz, Jack W Ransone, Christopher W Bach
The requisite combination of speed, power, and strength necessary for a bobsled push athlete coupled with the difficulty in directly measuring pushing ability makes selecting effective push crews challenging. Current practices by USA Bobsled and Skeleton (USABS) utilize field combine testing to assess and identify specifically selected performance variables in an attempt to best predict push performance abilities. Combine data consisting of 11 physical performance variables were collected from 75 subjects across two winter Olympic qualification years (2009 and 2013)...
March 12, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29517412/distribution-of-lower-extremity-work-during-clean-variations-performed-with-different-effort
#4
Torstein E Dæhlin, Tron Krosshaug, Loren Z F Chiu
The purpose of this research was to investigate how lower extremity work was distributed during the pull of cleans performed lifting the barbell to the minimum height required to receive it in a full squat (minimal height clean); or with maximum effort to elevate the barbell as high as possible and receiving it in either a full (maximal effort clean) or partial (power clean) squat. Eight weightlifters screened for proficient technique performed these clean variations at 80% of one repetition maximum. Work performed on the barbell and by the lower extremity net joint moments (NJM) was computed from marker trajectories and ground reaction forces...
March 8, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29461422/eight-weeks-of-strength-and-power-training-improves-club-head-speed-in-collegiate-golfers
#5
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/28912659/power-time-curve-comparison-between-weightlifting-derivatives
#6
Timothy J Suchomel, Christopher J Sole
This study examined the power production differences between weightlifting derivatives through a comparison of power-time (P-t) curves. Thirteen resistance-trained males performed hang power clean (HPC), jump shrug (JS), and hang high pull (HHP) repetitions at relative loads of 30%, 45%, 65%, and 80% of their one repetition maximum (1RM) HPC. Relative peak power (PPRel), work (WRel), and P-t curves were compared. The JS produced greater PPRel than the HPC (p < 0.001, d = 2.53) and the HHP (p < 0.001, d = 2...
September 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28792857/redistributing-load-using-wearable-resistance-during-power-clean-training-improves-athletic-performance
#7
RANDOMIZED CONTROLLED TRIAL
Caleb R Marriner, John B Cronin, Paul Macadam, Adam Storey
A popular method to improve athletic performance and lower body power is to train with wearable resistance (WR), for example, weighted vests. However, it is currently unknown what training effect this loading method has on full-body explosive movements such as the power clean. The purpose of this study was to determine what effects WR equivalent to 12% body mass (BM) had on the power clean and countermovement jump (CMJ) performance. Sixteen male subjects (age: 23.2 ± 2.7 years; BM: 90.5 ± 10.3 kg) were randomly assigned to five weeks of traditional (TR) power clean training or training with 12% BM redistributed from the bar to the body using WR...
October 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28753624/muscular-fatigue-in-response-to-different-modalities-of-crossfit-sessions
#8
José Luis Maté-Muñoz, Juan H Lougedo, Manuel Barba, Pablo García-Fernández, Manuel V Garnacho-Castaño, Raúl Domínguez
BACKGROUND: CrossFit is a new strength and conditioning regimen involving short intense daily workouts called workouts of the day (WOD). This study assesses muscular fatigue levels induced by the three modalities of CrossFit WOD; gymnastics (G), metabolic conditioning (M) and weightlifting (W). MATERIAL AND METHODS: 34 healthy subjects undertook three WOD (one per week): a G WOD consisting of completing the highest number of sets of 5 pull-ups, 10 push-ups and 15 air squats in 20 min; an M WOD, in which the maximum number of double skipping rope jumps was executed in 8 sets (20 s), resting (10 s) between sets; and finally, a W WOD in which the maximum number of power cleans was executed in 5 min, lifting a load equivalent to 40% of the individual's 1RM...
2017: PloS One
https://www.readbyqxmd.com/read/28538316/load-absorption-force-time-characteristics-following-the-second-pull-of-weightlifting-derivatives
#9
Timothy J Suchomel, Jason P Lake, Paul Comfort
The purpose of this study was to compare the load absorption force-time characteristics of weightlifting catching and pulling derivatives. Twelve resistance-trained men performed repetitions of the hang power clean (HPC), jump shrug (JS), and hang high pull (HHP) on a force platform with 30, 45, 65, and 80% of their 1-repetition maximum HPC. Load absorption phase duration, mean force, and work were calculated from the force-time data. The HHP produced a significantly longer load absorption phase duration compared with the HPC (p < 0...
June 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28372537/a-biomechanical-comparison-of-successful-and-unsuccessful-power-clean-attempts
#10
Kristof Kipp, Carolyn Meinerz
Although the power clean is an almost ubiquitous exercise in the strength and conditioning setting, relatively little is known about the biomechanics of successful and unsuccessful power clean lift attempts. The purpose of this study was to determine biomechanical differences between successful and unsuccessful power clean lift attempts in male collegiate athletes. Fifteen male lacrosse players (Age: 20.1 ± 1.2; Height: 1.78 ± 0.07 m; Body mass: 80.4 ± 8.1 kg; Relative one-repetition maximum power clean: 1...
June 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28166186/between-session-reliability-of-isometric-mid-thigh-pull-kinetics-and-maximal-power-clean-performance-in-male-youth-soccer-players
#11
Thomas Dos'Santos, Christopher Thomas, Paul Comfort, John J McMahon, Paul A Jones, Nick P Oakley, Ashley L Young
The aim of the study was to determine the between-session reliability of isometric mid-thigh pull (IMTP) kinetics and maximal weight lifted during the power clean (PC) in male youth soccer players, and to identify the smallest detectable differences between sessions. Thirteen male youth soccer players (age: 16.7 ± 0.5 years, height: 1.80 ± 0.08 m, mass: 70.5 ± 9.4 kg) performed three IMTP trials, while only ten soccer players performed maximal power cleans. These were performed twice, separated by 48 hours to examine the between-session reliability...
February 1, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27749730/a-comparison-of-catch-phase-force-time-characteristics-during-clean-derivatives-from-the-knee
#12
Paul Comfort, Robert Williams, Timothy J Suchomel, Jason P Lake
Comfort, P, Williams, R, Suchomel, TJ, and Lake, JP. A comparison of catch phase force-time characteristics during clean derivatives from the knee. J Strength Cond Res 31(7): 1911-1918, 2017-The aim of this study was to compare load-absorption force-time characteristics of the clean from the knee (CK), power clean from the knee (PCK), and clean pull from the knee (CPK). Ten collegiate athletes (age 27.5 ± 4.2 years; height 180.4 ± 6.7 cm; mass 84.4 ± 7.8 kg) performed 3 repetitions each of the CK, PCK, and CPK with 90% of their 1 repetition maximum power clean on a force platform...
July 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27669195/load-absorption-force-time-characteristics-following-the-second-pull-of-weightlifting-derivatives
#13
Timothy J Suchomel, Jason P Lake, Paul Comfort
The purpose of this study was to compare the load absorption force-time characteristics of weightlifting catching and pulling derivatives. Twelve resistance-trained men performed repetitions of the hang power clean (HPC), jump shrug (JS), and hang high pull (HHP) on a force platform with 30, 45, 65, and 80% of their one repetition maximum (1RM) HPC. Load absorption phase duration, mean force, and work were calculated from the force-time data. The HHP produced a significantly longer load absorption phase duration compared to the HPC (p < 0...
September 21, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27669182/mechanical-demands-of-the-hang-power-clean-and-jump-shrug-a-joint-level-perspective
#14
Kristof Kipp, Philip J Malloy, Jordan C Smith, Matthew D Giordanelli, Michael T Kiely, Christopher F Geiser, Timothy J Suchomel
Kipp, K, Malloy, PJ, Smith, J, Giordanelli, MD, Kiely, MT, Geiser, CF, and Suchomel, TJ. Mechanical demands of the hang power clean and jump shrug: a joint-level perspective. J Strength Cond Res 32(2): 466-474, 2018-The purpose of this study was to investigate the joint- and load-dependent changes in the mechanical demands of the lower extremity joints during the hang power clean (HPC) and the jump shrug (JS). Fifteen male lacrosse players were recruited from a National Collegiate Athletic Association DI team, and completed 3 sets of the HPC and JS at 30, 50, and 70% of their HPC 1 repetition maximum (1RM HPC) in a counterbalanced and randomized order...
February 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27400372/force-time-curve-comparison-between-weight-lifting-derivatives
#15
Timothy J Suchomel, Christopher J Sole
The force-production characteristics of 3 weight-lifting derivatives were examined by comparing the force-time curves of each exercise. Sixteen resistance-trained men performed repetitions of the hang power clean (HPC), jump shrug (JS), and hang high pull (HHP) on a force platform at several relative loads. Relative peak force (PFRel ), relative impulse (IMPRel ), peak rate of force development (PRFD), and time-normalized force-time curves of each exercise were compared. The JS produced greater PFRel than the HPC (P < ...
April 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/26963623/carbon-abatement-and-emissions-associated-with-the-gasification-of-walnut-shells-for-bioenergy-and-biochar-production
#16
Engil Isadora Pujol Pereira, Emma C Suddick, Johan Six
By converting biomass residue to biochar, we could generate power cleanly and sequester carbon resulting in overall greenhouse gas emissions (GHG) savings when compared to typical fossil fuel usage and waste disposal. We estimated the carbon dioxide (CO2) abatements and emissions associated to the concurrent production of bioenergy and biochar through biomass gasification in an organic walnut farm and processing facility in California, USA. We accounted for (i) avoided-CO2 emissions from displaced grid electricity by bioenergy; (ii) CO2 emissions from farm machinery used for soil amendment of biochar; (iii) CO2 sequestered in the soil through stable biochar-C; and (iv) direct CO2 and nitrous oxide (N2O) emissions from soil...
2016: PloS One
https://www.readbyqxmd.com/read/26618060/core-muscle-activity-during-the-clean-and-jerk-lift-with-barbell-versus-sandbags-and-water-bags
#17
Joaquin Calatayud, Juan C Colado, Fernando Martin, José Casaña, Markus D Jakobsen, Lars L Andersen
PURPOSE/BACKGROUND: While the traditional clean and jerk maneuver implies simultaneous participation of a large number of muscle groups, the use of this exercise with some variations to enhance core muscle activity remains uninvestigated. The purpose of this study was to compare the muscle activity during clean and jerk lift when performed with a barbell, sandbag and a water bag at same absolute load. STUDY DESIGN: Descriptive, repeated-measures study. METHODS: Twenty-one young fit male university students (age: 25 ± 2...
November 2015: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/26545275/effects-of-mouthguards-on-vertical-dimension-muscle-activation-and-athlete-preference-a-prospective-cross-sectional-study
#18
RANDOMIZED CONTROLLED TRIAL
C Colby Gage, Kellie C Huxel Bliven, R Curtis Bay, Jeremiah S Sturgill, Jae Hyun Park
Mandibular repositioning and subsequent neuromuscular signaling are proposed mechanisms of action for commercial mouthguards marketed for performance enhancement. A prospective cross-sectional study of 24 healthy adult weightlifters with normal occlusal relationships was designed to determine whether 2 self-fit performance mouthguards; a custom-fabricated, bilaterally balanced, dual-laminated mouthguard; and no mouthguard (control) differed in their effects on vertical dimension, muscle activation, and user preference during a 75% maximum power clean lift...
November 2015: General Dentistry
https://www.readbyqxmd.com/read/26439778/acute-physiological-responses-to-strongman-training-compared-to-traditional-strength-training
#19
COMPARATIVE STUDY
Nigel K Harris, Colm J Woulfe, Matthew R Wood, Deborah K Dulson, Ashley K Gluchowski, Justin B Keogh
Strongman training (ST) has become an increasingly popular modality, but data on physiological responses are limited. This study sought to determine physiological responses to an ST session compared to a traditional strength exercise training (RST) session. Ten healthy men (23.6 ± 27.5 years, 85.8 ± 10.3 kg) volunteered in a crossover design, where all participants performed an ST session, an RST session, and a resting session within 7 days apart. The ST consisted of sled drag, farmer's walk, 1 arm dumbbell clean and press, and tire flip at loads eliciting approximately 30 seconds of near maximal effort per set...
May 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/26340465/anthropometric-and-physical-qualities-of-international-level-female-rugby-sevens-athletes-based-on-playing-position
#20
Dana J Agar-Newman, Tyler L Goodale, Marc D Klimstra
Agar-Newman, DJ, Goodale, TL, and Klimstra, MD. Anthropometric and Physical Qualities of International Level Female Rugby Sevens Athletes Based on Playing Position. J Strength Cond Res 31(5): 1346-1352, 2017-The purpose of this study was to profile international level female sevens athletes and determine whether anthropometric and physical qualities are able to differentiate between backs and forwards. Twenty-four subjects with a mean (±SD) age of 22.8 ± 4.0 years and body weight of 69.4 ± 5.2 kg were sampled from a national team training program, ranked in the top 3 on the IRB Women's Sevens World Series...
May 2017: Journal of Strength and Conditioning Research
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