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https://www.readbyqxmd.com/read/27552211/enhancing-digital-video-analysis-of-bar-kinematics-in-weightlifting-a-case-study
#1
Torstein E Dæhlin, Tron Krosshaug, Loren Z F Chiu
Weightlifting technique can be objectively assessed from two-dimensional video recordings. Despite its importance, participants' bar trajectories in research involving the snatch or clean exercises are often not reported, potentially due to the time required to digitize video. The purpose of this investigation was to evaluate the use of an LED-based marker, digital video and open source software to automatically track the bar end during weightlifting exercises. A former national-level weightlifter was recorded with a digital video camera performing the snatch, clean and jerk, and squat exercises...
August 19, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27457913/neuromuscular-responses-to-short-term-resistance-training-with-traditional-and-daily-undulating-periodization-in-adolescent-elite-judoka
#2
Boris Ullrich, Thiemo Pelzer, Sergio Oliveira, Mark Pfeiffer
Ullrich, B, Pelzer, T, Oliveira, S, and Pfeiffer, M. Neuromuscular responses to short-term resistance training with traditional and daily undulating periodization in adolescent elite judoka. J Strength Cond Res 30(8): 2083-2099, 2016-The influence of different periodization models on neuromuscular outcomes after short-term strength training periods has not been examined in adolescent athletes. Eleven elite judoka (age: 14.8 ± 0.6 years, height: 163.2 ± 7.5 cm, body mass: 57.3 ± 11.1 kg, 5 boys/6 girls, and strength training experience: 2...
August 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/26618060/core-muscle-activity-during-the-clean-and-jerk-lift-with-barbell-versus-sandbags-and-water-bags
#3
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/26261428/do-physiological-measures-predict-selected-crossfit-%C3%A2-benchmark-performance
#4
Scotty J Butcher, Tyler J Neyedly, Karla J Horvey, Chad R Benko
PURPOSE: CrossFit(®) is a new but extremely popular method of exercise training and competition that involves constantly varied functional movements performed at high intensity. Despite the popularity of this training method, the physiological determinants of CrossFit performance have not yet been reported. The purpose of this study was to determine whether physiological and/or muscle strength measures could predict performance on three common CrossFit "Workouts of the Day" (WODs). MATERIALS AND METHODS: Fourteen CrossFit Open or Regional athletes completed, on separate days, the WODs "Grace" (30 clean and jerks for time), "Fran" (three rounds of thrusters and pull-ups for 21, 15, and nine repetitions), and "Cindy" (20 minutes of rounds of five pull-ups, ten push-ups, and 15 bodyweight squats), as well as the "CrossFit Total" (1 repetition max [1RM] back squat, overhead press, and deadlift), maximal oxygen consumption (VO2max), and Wingate anaerobic power/capacity testing...
2015: Open Access Journal of Sports Medicine
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
#5
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/25965846/iron-supplementation-prevents-a-decline-in-iron-stores-and-enhances-strength-performance-in-elite-female-volleyball-players-during-the-competitive-season
#6
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/25678038/predicting-severe-enterovirus-71-infection-age-comorbidity-and-parental-behavior-matter
#7
Wen-Chan Huang, Wei-Liang Shih, Shun-Cheng Yang, Ting-Yu Yen, Jian-Te Lee, Yi-Chuan Huang, Chung-Chen Li, Yu-Chia Hsieh, Tzou-Yin Lin, Luan-Yin Chang, Li-Min Huang
OBJECTIVE: Enterovirus 71 (EV71) is one of the major pathogens that cause severe enteroviral infections. Our aim was to study the behavioral and household risk factors for its serious complications. METHODS: Between May 2011 and November 2012, we enrolled children who had symptoms of EV71 infection from six hospitals in Taiwan. The caregivers of each patient were interviewed to determine their hand hygiene habits in relation to EV71 infection. The severity of EV71 infection was classified as follows: Stage 1, hand-foot-mouth disease or herpangina; Stage 2, meningitis or myoclonic jerk; Stage 3A, encephalitis; Stage 3B, cardiopulmonary failure...
November 22, 2014: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/25640639/stress-responses-to-short-term-intensified-and-reduced-training-in-competitive-weightlifters
#8
A G Storey, N P Birch, V Fan, H K Smith
We sought to identify and evaluate the tolerance to, and consequences of, short-term variations in training load in competitive weightlifters. Seven international-level lifters performed 1 week of initial training followed by 2 weeks of intensified (INT: +100%, 36.5 ± 11.3 × 10(3)  kg/week) and 1 week of subsequently reduced (RED: -25%) training within their annual program. After INT, but not RED, 90 min of weightlifting increased mRNA levels of chemokine (C-C motif) ligand 4 (CCL4), chemokine (C-X-C motif) receptor 4 (CXCR4) and cellular stress-associated DNA-damage-inducible transcript 4 (DDIT4) in peripheral blood mononuclear cells by 40-240%...
January 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/25117722/temporal-specificity-of-training-intra-day-effects-on-biochemical-responses-and-olympic-weightlifting-performances
#9
RANDOMIZED CONTROLLED TRIAL
Achraf Ammar, Hamdi Chtourou, Khaled Trabelsi, Johnny Padulo, Mouna Turki, Kais El Abed, Anitta Hoekelmann, Ahmed Hakim
The aim of this study was to investigate the performance of an Olympic-Weightlifting session training at three times of the day on the performance related to biochemical responses. Nine weightlifters (21 ± 0.5 years) performed, in randomised order, on three Olympic-Weightlifting training (snatch, clean and jerk) sessions (08:00 a.m., 02:00 p. m., 06:00 p. m.). Blood samples were collected: before, 3 min and 48 h after each training session. Haematological parameters and markers of muscle injury were assessed...
2015: Journal of Sports Sciences
https://www.readbyqxmd.com/read/24150141/the-relationship-between-isometric-and-dynamic-strength-in-college-football-players
#10
Michael R McGuigan, Jason B Winchester
Previous research has demonstrated the importance of both dynamic and isometric maximal strength and rate of force development (RFD) in athletic populations. The purpose of this study was to examine the relationships between measures of isometric force (PF), RFD, jump performance and strength in collegiate football athletes. The subjects in this study were twenty-two men [(mean ± SD):age 18.4 ± 0.7 years; height 1.88 ± 0.07 m; mass 107.6 ± 22.9 kg] who were Division I college football players. They were tested for PF using the isometric mid thigh pull exercise...
2008: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/23903539/relationships-of-isometric-mid-thigh-pull-variables-to-weightlifting-performance
#11
G Beckham, S Mizuguchi, C Carter, K Sato, M Ramsey, H Lamont, G Hornsby, G Haff, M Stone
AIM: The purpose of this study was to evaluate the relationship between weightlifting performance (snatch, clean and jerk, and total) and variables obtained from the isometric mid-thigh pull (IMTP). METHODS: Twelve weightlifters, ranging from novice to advanced, performed the IMTP 10 days after a competition. Correlations were used to evaluate relationships between variables of the IMTP and absolute and scaled competition results. RESULTS: Unscaled competition results correlated strongly with IRFD (0-200ms: r=0...
October 2013: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/23489349/motor-control-of-the-trunk-during-a-modified-clean-and-jerk-lift
#12
M Eriksson Crommert, M M Ekblom, A Thorstensson
The purpose of the present study was to investigate the pattern of trunk muscle activation and intra-abdominal pressure (IAP) in a somewhat modified version of the clean and jerk lift. Nine healthy physically active male amateurs performed the exercise with a 30-kg barbell. Muscle activity was registered with electromyography from transversus abdominis (TrA) and obliquus internus (OI) using intramuscular electrodes and from rectus abdominis (RA) and erector spinae (ES) with surface electrodes. IAP was recorded with a nasogastric catheter...
October 2014: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/22873835/unique-aspects-of-competitive-weightlifting-performance-training-and-physiology
#13
REVIEW
Adam Storey, Heather K Smith
Weightlifting is a dynamic strength and power sport in which two, multijoint, whole-body lifts are performed in competition; the snatch and clean and jerk. During the performance of these lifts, weightlifters have achieved some of the highest absolute and relative peak power outputs reported in the literature. The training structure of competitive weightlifters is characterized by the frequent use of high-intensity resistance exercise movements. Varied coaching and training philosophies currently exist around the world and further research is required to substantiate the best type of training programme for male and female weightlifters of various age groups...
September 1, 2012: Sports Medicine
https://www.readbyqxmd.com/read/22549084/transference-of-kettlebell-training-to-strength-power-and-endurance
#14
Pasquale Manocchia, David K Spierer, Adrienne K S Lufkin, Jacqueline Minichiello, Jessica Castro
Kettlebells are a popular implement in many strength and conditioning programs, and their benefits are touted in popular literature, books, and videos. However, clinical data on their efficacy are limited. The purpose of this study was to examine whether kettlebell training transfers strength and power to weightlifting and powerlifting exercises and improves muscular endurance. Thirty-seven subjects were assigned to an experimental (EXP, n = 23; mean age = 40.9 ± 12.9 years) or a control group (CON; n = 14; mean age = 39...
February 2013: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/21116196/the-effects-of-training-volume-and-competition-on-the-salivary-cortisol-concentrations-of-olympic-weightlifters
#15
Blair T Crewther, Taati Heke, Justin W L Keogh
This study examined the effects of training volume and competition on the salivary cortisol (Sal-C) concentrations of Olympic weightlifters. Male (n = 5) and female (n = 4) Olympic weightlifters provided saliva samples across a 5-week experimental = period. The first aim was to assess the weekly effects of high (≥ 200 sets) and low (≤ 100 sets) training volume on Sal-C. The second aim was to compare Sal-C concentrations and 1 repetition maximum (1RM) performance during 2 simulated and 2 actual competitions...
January 2011: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/20842101/relationships-between-salivary-testosterone-and-cortisol-concentrations-and-training-performance-in-olympic-weightlifters
#16
B T Crewther, Cook Christian
AIM: This study examined the relationships between salivary testosterone (Sal-T) and cortisol (Sal-C) concentrations and training performance in Olympic weightlifters. METHODS: Four male and four female Olympic weightlifters each provided saliva samples before and after four workouts during a four-week training period. Training involved the same three exercises; snatch, clean and jerk, and front squat with the one repetition maximum (1RM) calculated for each exercise during each workout...
September 2010: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/20386124/characteristics-of-sprint-performance-in-college-football-players
#17
William F Brechue, Jerry L Mayhew, Fontaine C Piper
To investigate sprinting strategy, acceleration and velocity patterns were determined in college football players (n = 61) during performance of a 9.1-, 36.6-, and 54.9-m sprints. Acceleration and velocity were determined at 9.1-m intervals during each sprint. Lower-body strength and power were evaluated by 1 repetition maximum (1-RM) squat, power clean, jerk, vertical jump, standing long jump, and standing triple jump. Sprint times averaged 1.78 +/- 0.11 seconds (9.1 m), 5.18 +/- 0.35 seconds (36.6 m), and 7...
May 2010: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/19620931/youth-resistance-training-updated-position-statement-paper-from-the-national-strength-and-conditioning-association
#18
REVIEW
Avery D Faigenbaum, William J Kraemer, Cameron J R Blimkie, Ian Jeffreys, Lyle J Micheli, Mike Nitka, Thomas W Rowland
Faigenbaum, AD, Kraemer, WJ, Blimkie, CJR, Jeffreys, I, Micheli, LJ, Nitka, M, and Rowland, TW. Youth resistance training: Updated position statement paper from the National Strength and Conditioning Association. J Strength Cond Res 23(5): S60-S79, 2009-Current recommendations suggest that school-aged youth should participate daily in 60 minutes or more of moderate to vigorous physical activity that is developmentally appropriate and enjoyable and involves a variety of activities (). Not only is regular physical activity essential for normal growth and development, but also a physically active lifestyle during the pediatric years may help to reduce the risk of developing some chronic diseases later in life ()...
August 2009: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/19387408/could-the-deep-squat-jump-predict-weightlifting-performance
#19
Francisco J Vizcaya, Oscar Viana, Miguel Fernandez del Olmo, Rafael Martin Acero
This research was carried out with the aim of describing the deep squat jump (DSJ) and comparing it with the squat (SJ) and countermovement (CMJ) jumps, to introduce it as a strength testing tool in the monitoring and control of training in strength and power sports. Forty-eight male subjects (21 weightlifters, 12 triathletes, and 15 physical education students) performed 3 trials of DSJ, SJ, and CMJ with a 1-minute rest among them. For the weightlifters, snatch and clean and jerk results during the Spanish Championship 2004 and the 35th EU Championships 2007 were collected to study the relationship among vertical jumps and weightlifters' performance...
May 2009: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/18550958/force-time-curve-characteristics-and-hormonal-alterations-during-an-eleven-week-training-period-in-elite-women-weightlifters
#20
G Gregory Haff, Janna R Jackson, Naoki Kawamori, Jon M Carlock, Michael J Hartman, J Lon Kilgore, Robert T Morris, Michael W Ramsey, William A Sands, Michael H Stone
The purpose of this investigation was to study the effects of an 11-week training period performed by female weightlifters. Two weeks before this investigation, baseline measures for total testosterone, cortisol, and testosterone:cortisol ratio were collected. The 11-week training program consisted of the core exercises (i.e., clean, clean and jerk, and snatch) and other supplemental exercises (i.e., clean pull, snatch pull, squat, and front squat). Hormonal, isometric, and dynamic middle thigh pull force-time curve characteristics were assessed biweekly throughout the duration of the investigation, whereas volume load and training intensity were assessed weekly throughout the investigation...
March 2008: Journal of Strength and Conditioning Research
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