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https://www.readbyqxmd.com/read/27749730/a-comparison-of-catch-phase-force-time-characteristics-during-clean-derivatives-from-the-knee
#1
Paul Comfort, Robert Williams, Timothy J Suchomel, Jason P Lake
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 three repetitions each of the CK, PCK and CPK with 90% of their 1RM power clean on a force platform. The CK load-absorption duration (0.95 ± 0.35 s) was significantly longer compared to the CPK (0.44 ± 0.15 s; p < 0.001, d = 2...
September 27, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27669195/load-absorption-force-time-characteristics-following-the-second-pull-of-weightlifting-derivatives
#2
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
#3
Kristof Kipp, Philip J Malloy, Jordan Smith, Matthew D Giordanelli, Michael T Kiely, Christopher F Geiser, Timothy J Suchomel
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 an NCAA DI team, and completed three sets of the HPC and JS at 30%, 50%, and 70% of their HPC 1-Repetition Maximum (1-RM HPC) in a counterbalanced and randomized order. Motion analysis and force plate technology were used to calculate the positive work, propulsive phase duration, and peak concentric power at the hip, knee, and ankle joints...
September 16, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27400372/force-time-curve-comparison-between-weightlifting-derivatives
#4
Timothy J Suchomel, Christopher J Sole
The force production characteristics of three weightlifting 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 compared to the HPC (p < 0...
August 24, 2016: 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
#5
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
#6
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
#7
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
#8
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
#9
Dana J Agar-Newman, Tyler Goodale, Marc Klimstra
The purpose of this study was to profile international level female sevens athletes and determine if 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±5.2kg were sampled from a national team training program, ranked in the top 3 on the IRB Women's Sevens World Series. Anthropometric (height, body mass and sum of 7 skinfolds) and performance measures (power clean, front squat, bench press, neutral grip pull up, 40m sprint and 1600m run) were collected across the 2013-2014 centralized period and compared across playing position...
August 28, 2015: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/26224330/dietary-intake-habits-and-controlled-training-on-body-composition-and-strength-in-elite-female-volleyball-players-during-the-season
#10
Juan Mielgo-Ayuso, Michael C Zourdos, Julio Calleja-González, Aritz Urdampilleta, Sergej M Ostojic
UNLABELLED: The purpose of this study was to assess dietary intake of elite female volleyball players (EFVPs, n = 22) during the first 11 weeks of the competitive season. Further, we compared findings for total energy intake and specific macronutrient distribution with the established recommendations for high-intensity athletes. Subjects also engaged in periodized training and we assessed changes in body composition (BC) and strength. Twenty-two EFVPs had dietary intake (7-day dietary recall and food-frequency questionnaire), BC (body mass index (BMI), body fat percentage, fat mass, muscle mass), and 1-repetition maximum (1RM) strength (bench press, military press, back squat, power clean, clean and jerk, pull-over) assessed at baseline (T0, before preseason) and 11 weeks later (T11)...
August 2015: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/26063470/the-optimal-load-for-maximal-power-production-during-lower-body-resistance-exercises-a-meta-analysis
#11
Marco A Soriano, Pedro Jiménez-Reyes, Matthew R Rhea, Pedro J Marín
BACKGROUND: The development of muscular power is often a key focus of sports performance enhancement programs. OBJECTIVE: The purpose of this meta-analysis was to examine the effect of load on peak power during the squat, jump squat, power clean, and hang power clean, thus integrating the findings of various studies to provide the strength and conditioning professional with more reliable evidence upon which to base their program design. METHODS: A search of electronic databases [MEDLINE (SPORTDiscus), PubMed, Google Scholar, and Web of Science] was conducted to identify all publications up to 30 June 2014...
August 2015: Sports Medicine
https://www.readbyqxmd.com/read/25965846/iron-supplementation-prevents-a-decline-in-iron-stores-and-enhances-strength-performance-in-elite-female-volleyball-players-during-the-competitive-season
#12
RANDOMIZED CONTROLLED TRIAL
Juan Mielgo-Ayuso, Michael C Zourdos, Julio Calleja-González, Aritz Urdampilleta, Sergej Ostojic
The primary aim of this study was to examine the effects of 11 weeks of iron supplementation on hematological and strength markers in elite female volleyball players. Twenty-two volleyball players (aged 27.0 ± 5.6 years) from 2 Spanish First National League teams participated and were counterbalanced into 1 of 2 groups based upon iron status: (i) control group (CG, n = 11); or (ii) iron treatment group (ITG, n = 11), which received 325 mg/day of ferrous sulphate daily. Subjects performed their team's regimen of training or match play every day...
June 2015: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/25932750/jump-shrug-height-and-landing-forces-across-various-loads
#13
Timothy J Suchomel, Christopher B Taber, Glenn A Wright
The purpose of this study was to examine the effect that load has on the mechanics of the jump shrug. Fifteen track and field and club/intramural athletes (age 21.7 ± 1.3 y, height 180.9 ± 6.6 cm, body mass 84.7 ± 13.2 kg, 1-repetition-maximum (1RM) hang power clean 109.1 ± 17.2 kg) performed repetitions of the jump shrug at 30%, 45%, 65%, and 80% of their 1RM hang power clean. Jump height, peak landing force, and potential energy of the system at jump-shrug apex were compared between loads using a series of 1-way repeated-measures ANOVAs...
January 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/25896197/the-effect-of-load-and-sex-on-kinematic-and-kinetic-variables-during-the-mid-thigh-clean-pull
#14
Paul Comfort, Paul A Jones, Rebecca Udall
Power is a fundamental component for many sporting activities; while the load that elicits peak power during different exercises and differences between sexes remains unclear. This study aims to determine the effect of sex and load on kinematic and kinetic variables during the mid-thigh clean pull. Men (n = 10) and women (n = 10) performed the mid-thigh clean pull at intensities of 40%, 60%, 80%, 100%, 120%, and 140% of one repetition maximum (1RM) power clean in a randomised and counter-balanced order, while assessing bar velocity, bar displacement, power, force, and impulse...
June 2015: Sports Biomechanics
https://www.readbyqxmd.com/read/25559912/reliability-of-maximal-back-squat-and-power-clean-performances-in-inexperienced-athletes
#15
Paul Comfort, John J McMahon
The aim of the study was to determine between-session reliability of maximal weight lifted during the back squat and power clean, in inexperienced athletes, and to identify the smallest detectable difference between sessions. Forty-four collegiate athletes (men: n = 32; age: 21.5 ± 2.0 years; height: 180.0 ± 6.1 cm; body mass: 81.01 ± 7.42 kg; women: n = 12; age: 21.0 ± 1.9 years; height: 169.0 ± 5.2 cm; body mass: 62.90 ± 7.46 kg) participated in this study. One repetition maximum (1RM) back squat and power cleans were each performed twice on separate days, 3-5 days apart...
November 2015: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/25559908/learning-the-hang-power-clean-kinetic-kinematic-and-technical-changes-in-four-weightlifting-naive-athletes
#16
William B Haug, Eric J Drinkwater, Dale W Chapman
The investment in learning required to reach benefit with weightlifting training is currently not well understood in elite athletes. The purpose of this investigation was to quantify changes in vertical jump power production and kinematic variables in hang power clean (HPC) performance during the learning process from a naive state in a multiple single-subject research design. Four elite athletes undertook HPC learning for approximately 20-30 minutes twice per week over a 169-day period. Changes in parameters of vertical power production during squat jump (SJ) and countermovement jump (CMJ) were monitored from baseline (day 0) and at 3 additional occasions...
July 2015: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/25426514/effect-of-various-loads-on-the-force-time-characteristics-of-the-hang-high-pull
#17
Timothy J Suchomel, George K Beckham, Glenn A Wright
The purpose of this study was to investigate the effect of various loads on the force-time characteristics associated with peak power during the hang high pull (HHP). Fourteen athletic men (age: 21.6 ± 1.3 years; height: 179.3 ± 5.6 cm; body mass: 81.5 ± 8.7 kg; 1 repetition maximum [1RM] hang power clean [HPC]: 104.9 ± 15.1 kg) performed sets of the HHP at 30, 45, 65, and 80% of their 1RM HPC. Peak force, peak velocity, peak power, force at peak power, and velocity at peak power were compared between loads...
May 2015: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/24968513/the-impact-of-load-on-lower-body-performance-variables-during-the-hang-power-clean
#18
Timothy J Suchomel, George K Beckham, Glenn A Wright
This study examined the impact of load on lower body performance variables during the hang power clean. Fourteen men performed the hang power clean at loads of 30%, 45%, 65%, and 80% 1RM. Peak force, velocity, power, force at peak power, velocity at peak power, and rate of force development were compared at each load. The greatest peak force occurred at 80% 1RM. Peak force at 30% 1RM was statistically lower than peak force at 45% (p = 0.022), 65% (p = 0.010), and 80% 1RM (p = 0.018). Force at peak power at 65% and 80% 1RM was statistically greater than force at peak power at 30% (p < 0...
March 2014: Sports Biomechanics
https://www.readbyqxmd.com/read/24910958/relationship-between-selected-strength-and-power-assessments-to-peak-and-average-velocity-of-the-drive-block-in-offensive-line-play
#19
Bert H Jacobson, Eric C Conchola, Doug B Smith, Kazuma Akehi, Rob G Glass
Jacobson, BH, Conchola, EC, Smith, DB, Akehi, K, and Glass, RG. Relationship between selected strength and power assessments to peak and average velocity of the drive block in offensive line play. J Strength Cond Res 30(8): 2202-2205, 2016-Typical strength training for football includes the squat and power clean (PC) and routinely measured variables include 1 repetition maximum (1RM) squat and 1RM PC along with the vertical jump (VJ) for power. However, little research exists regarding the association between the strength exercises and velocity of an actual on-the-field performance...
August 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/24852127/scaling-which-methods-best-predict-performance
#20
COMPARATIVE STUDY
Paul Comfort, Stephen J Pearson
Athletes with a higher body mass (BM) tend to be stronger, with ratio scaling possibly eliminating this effect. The aim of this study was to compare relationships between sprint performances with scaled measures of strength and power. Fifteen professional rugby league players (age, 26.27 6 3.87 years; height, 183.33 6 6.37 cm; BM, 96.86 6 11.49 kg) performed 1 repetition maximum back squats, power cleans, squat jumps, and sprints (5, 10, and 20 m). Heavier athletes (forward) generated significantly greater absolute levels of power during the squat jump (5,659...
June 2014: Journal of Strength and Conditioning Research
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