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https://www.readbyqxmd.com/read/28338394/inter-and-intra-subject-similarity-of-muscle-synergies-during-bench-press-with-slow-and-fast-velocity
#1
Afshin Samani, Mathias Kristiansen
We investigated the effect of low and high bar velocity on inter- and intra-subject similarity of muscle synergies during bench press. Thirteen trained male subjects underwent two exercise conditions, i.e. a slow and a fast velocity bench press. Surface electromyography was recorded from thirteen muscles and muscle synergies were extracted using a non-negative matrix factorization algorithm. The intra-subject similarity across conditions and inter-subject similarity within conditions were computed for muscle synergy vectors and activation coefficients...
March 24, 2017: Motor Control
https://www.readbyqxmd.com/read/28328719/predicting-the-maximum-dynamic-strength-in-bench-press-the-high-precision-of-the-bar-velocity-approach
#2
Irineu Loturco, Ronaldo Kobal, José E Moraes, Katia Kitamura, César C Cal Abad, Lucas A Pereira, Fábio Y Nakamura
Loturco, I, Kobal, R, Moraes, JE, Kitamura, K, Cal Abad, CC, Pereira, LA, and Nakamura, FY. Predicting the maximum dynamic strength in bench press: the high precision of the bar velocity approach. J Strength Cond Res 31(4): 1127-1131, 2017-The aim of this study was to determine the force-velocity relationship and test the possibility of determining the 1 repetition maximum (1RM) in "free weight" and Smith machine bench presses. Thirty-six male top-level athletes from 3 different sports were submitted to a standardized 1RM bench press assessment (free weight or Smith machine, in randomized order), following standard procedures encompassing lifts performed at 40-100% of 1RM...
April 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28327505/technical-aspects-and-validation-of-a-new-biofeedback-system-for-measuring-lower-limb-loading-in-the-dynamic-situation
#3
Marco Raaben, Herman R Holtslag, Robin Augustine, Rutger O van Merkerk, Bart F J M Koopman, Taco J Blokhuis
BACKGROUND: A variety of techniques for measuring lower limb loading exists, each with their own limitations. A new ambulatory biofeedback system was developed to overcome these limitations. In this study, we described the technical aspects and validated the accuracy of this system. METHODS: A bench press was used to validate the system in the static situation. Ten healthy volunteers were measured by the new biofeedback system and a dual-belt instrumented treadmill to validate the system in the dynamic situation...
March 22, 2017: Sensors
https://www.readbyqxmd.com/read/28327461/muscle-strength-is-impaired-in-men-but-not-in-women-living-with-hiv-taking-antiretroviral-therapy
#4
Vitor Hf Oliveira, Susana L Wiechmann, Argéria Ms Narciso, Allison R Webel, Rafael Deminice
BACKGROUND: There is evidence that HIV Antiretroviral Therapy adverse effects may be sex-dependent, but data examing these sex differences in muscle strength is scarce. Our aim was to compare dynamic and isokinetic parameters of muscle strength between HIV-infected men and women to HIV-uninfected subjects. METHODS: In this cross-sectional study, muscle strength was evaluated in 44 HIV-infected (20 men, 24 women) and 25 age-, race- and body mass index-matched HIV-uninfected subjects (11 men, 14 women)...
March 22, 2017: Antiviral Therapy
https://www.readbyqxmd.com/read/28301439/efficacy-of-the-repetitions-in-reserve-based-rating-of-perceived-exertion-for-the-bench-press-in-experienced-and-novice-benchers
#5
Michael J Ormsbee, Joseph P Carzoli, Alex Klemp, Brittany R Allman, Michael C Zourdos, Jeong-Su Kim, Lynn B Panton
Autoregulation (AR) is the practice of adjusting training variables in response to athlete feedback. One component of AR postulated to enhance resistance training adaptations involves implementing a resistance training-specific rating of perceived exertion (RPE) scale measuring repetitions in reserve (RIR). The purpose of this study was to examine the efficacy of this method using the bench press exercise. METHODS: Twenty-seven college-aged men were assigned to one of two groups based upon training age: experience benchers (EB) (n=14, training age: 4...
March 13, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28282743/can-changes-in-resistance-exercise-workload-influence-internal-load-countermovement-jump-performance-and-the-endocrine-response
#6
Daniel J Hiscock, Brian Dawson, Michael Clarke, Peter Peeling
This study examined the influence of differing volume load and intensity (%1 repetition maximum[%1RM]) resistance exercise workouts on session rating of perceived exertion (sRPE) countermovement jump (CMJ) performance and endocrine responses. Twelve participants performed a workout comprising four exercises (bench press, back squat, deadlift and prone bench pull) in randomised order as either power (POW); 3 sets × 6 repetitions at 45%1RM × 3 min inter-set rest, strength (ST); 3 sets × 3 repetitions at 90%1RM × 3 min inter-set rest, or hypertrophy (HYP); 3 sets × 10 repetitions at 70%1RM × 1 min inter-set rest in a randomised-crossover design...
February 23, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28277425/the-influence-of-resistance-training-experience-on-the-between-day-reliability-of-commonly-used-strength-measures-in-male-youth-athletes
#7
Jonathon Weakley, Kevin Till, Joshua Darrall-Jones, Gregory Roe, Padraic Phibbs, Dale Read, Ben Jones
The purpose of this study was to determine the between-day reliability of commonly used strength measures in male youth athletes, while considering resistance training experience. Data were collected on 25 male athletes over two testing sessions, with 72 hours rest between, for the 3RM front squat, chin up and bench press. Subjects were initially categorized by resistance training experience (inexperienced; 6-12 months, experienced; >2 years). The assessment of the between-day reliability (coefficient of variation [CV%]) showed the front squat (experienced: 2...
March 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28260202/biochemical-responses-and-physical-performance-during-high-intensity-resistance-circuit-training-in-hypoxia-and-normoxia
#8
Domingo J Ramos-Campo, Jacobo A Rubio-Arias, Stéphane Dufour, Linda Chung, Vicente Ávila-Gandía, Pedro E Alcaraz
PURPOSE: The aim of this study was to analyze the effect of hypoxia on metabolic and acid-base balance, blood oxygenation, electrolyte, and half-squat performance variables during high-resistance circuit (HRC) training. METHODS: Twelve resistance-trained subjects participated in this study. After a 6RM testing session, participants performed three randomized trials of HRC: normoxia (NORM: FiO2 = 0.21), moderate hypoxia (MH: FiO2 = 0.16), or high hypoxia (HH: FiO2 = 0...
March 4, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28255966/effect-of-resistance-exercise-on-arterial-stiffness-during-the-follicular-and-luteal-phases-of-the-menstrual-cycle
#9
Takanobu Okamoto, Ryota Kobayashi, Mikako Sakamaki-Sunaga
Acute high-intensity resistance exercise increases arterial stiffness. Changes in blood concentrations of estrogen and progesterone associated with the menstrual cycle affect the degree of arterial stiffness. Therefore, high-intensity resistance exercise may affect arterial stiffness differently depending on the phase of the menstrual cycle. The purpose of this study was to investigate the effects of different phases of the menstrual cycle on arterial stiffness after one session of resistance exercise. The participants were 9 eumenorrheic females (21...
March 2, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28225524/the-effects-of-ballistic-and-non-ballistic-bench-press-on-mechanical-variables
#10
Gavin L Moir, Shawn N Munford, Lindsey L Moroski, Shala E Davis
PURPOSE: To investigate the effects of ballistic and non-ballistic bench press performed with loads equivalent to 30 and 90% 1-repetition maximum (1-RM) on mechanical variables. METHODS: Eleven resistance-trained men (age: 23.0 ± 1.4 years; mass: 98.4 ± 14.4 kg) attended four testing sessions where they performed one of the following sessions: 1) three sets of five non-ballistic repetitions performed with a load equivalent to 30% 1-RM (30N-B), 2) three sets of five ballistic repetitions performed with a load equivalent to 30% 1-RM (30B), 3) three sets of four non-ballistic repetitions with a load equivalent to 90% 1-RM (90N-B), 4) three sets of four ballistic repetitions with a load equivalent to 90% 1-RM (90B)...
February 21, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28222577/acute-ingestion-of-neuromuscular-enhancement-supplements-do-not-improve-power-output-work-capacity-and-cognition
#11
Jennifer A Bunn, Andrew Crossley, Morgan D Timiney
BACKGROUND: Improving motor unit recruitment and function is trainable and positively affects performance. Evidence suggests that supplementation of choline, uridine, and docosahexaenoic acid (DHA) may also enhance neuromuscular function. The purpose of this study was to assess the influence of acute ingestion of these supplements on anaerobic exercise performance and cognition. METHODS: Twenty college-aged trained males (21.2 ± 1.4 years, 181.2 ± 6.1 cm, 94.4 ± 20...
February 21, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28217216/repair-of-double-head-pectoralis-major-tendon-avulsion-into-its-native-footprint-using-bi-cortical-endobuttons-and-tendon-sliding-technique
#12
Jagadish Prabhu, Mohammed Khalid Faqi, Fahad Alkhalifa, Bader Kamal Tayara, Rashad Khamis Awad
Injuries to the pectoralis major muscle are relatively infrequent. The mechanism of injury is usually an eccentric shortening of the pectoralis major under heavy load, such as when performing a bench press exercise. We report a case that presented to us with a history of sudden pain in the left pectoral region while doing heavy bench press exercise. The patient sustained a type III D pectoralis muscle -tendon avulsion. Surgical repair was done through a bi-cortical tendon sliding technique using two cortical buttons...
2017: Open Orthopaedics Journal
https://www.readbyqxmd.com/read/28195973/repetition-performance-and-blood-lactate-responses-adopting-different-recovery-periods-between-training-sessions-in-trained-men
#13
Humberto Miranda, Marianna de Freitas Maia, Gabriel Andrade Paz, João A A A de Souza, Roberto Simão, Déborah de Araújo Farias, Jeffrey M Willardson
The purpose of this study was to examine the effect of different recovery periods (24h, 48h, and 72h) between repeated resistance training (RT) sessions for the upper body muscles on repetition performance and blood lactate responses in trained men. Sixteen recreationally trained men (age: 26.1 ± 3.1 years; height: 179 ± 4.5 cm; body mass: 82.6 ± 4.0 kg, 4.5 ± 2.2 years of RT experience) participated in this study. Eight-repetition maximum (8-RM) loads were determined for the bench press (BP), 30° incline bench press (BP30), and 45° incline bench press (BP45) exercises...
February 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28192832/velocity-loss-as-a-variable-for-monitoring-resistance-exercise
#14
Juan José González-Badillo, Juan Manuel Yañez-García, Ricardo Mora-Custodio, David Rodríguez-Rosell
This study aimed to analyze: 1) the pattern of repetition velocity decline during a single set to failure against different submaximal loads (50-85% 1RM) in the bench press exercise; and 2) the reliability of the percentage of performed repetitions, with respect to the maximum possible number that can be completed, when different magnitudes of velocity loss have been reached within each set. Twenty-two men performed 8 tests of maximum number of repetitions (MNR) against loads of 50-55-60-65-70-75-80-85% 1RM, in random order, every 6-7 days...
March 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28177725/effects-of-phosphatidic-acid-supplementation-on-muscle-thickness-and-strength-in-resistance-trained-men
#15
Adam M Gonzalez, Katie M Sell, Jamie J Ghigiarelli, Christopher F Kelly, Edward W Shone, Matthew R Accetta, Jamie B Baum, Gerald T Mangine
The purpose of this study was to investigate the effects of phosphatidic acid (PA) supplementation on muscle thickness and strength following an 8 week supervised resistance-training program. Fifteen resistance trained men (22.8 ± 3.5 years; 80.6 ± 8.7 kg; 178.1 ± 5.6 cm; 14.6% ± 8.8% body fat) were randomly assigned to a group that either consumed 750 mg of PA or a placebo (PL). Testing was carried out before (PRE) and after (POST) training/supplementation for muscle thickness and strength. Muscle thickness of the rectus femoris (RF), vastus lateralis (VL), biceps brachii (BB), and triceps brachii (TB) muscles were measured via ultrasonography, along with 1 repetition maximum (1RM) of squat, deadlift, and bench press...
January 5, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28173929/postflight-reconditioning-for-european-astronauts-a-case-report-of-recovery-after-six-months-in-space
#16
Nora Petersen, Gunda Lambrecht, Jonathan Scott, Natalie Hirsch, Maria Stokes, Joachim Mester
BACKGROUND: Postflight reconditioning of astronauts is understudied. Despite a rigorous, daily inflight exercise countermeasures programme during six months in microgravity (μG) on-board the International Space Station (ISS), physiological impairments occur and postflight reconditioning is still required on return to Earth. Such postflight programmes are implemented by space agency reconditioning specialists. Case Description and Assessments: A 38 year old male European Space Agency (ESA) crewmember's pre- and postflight (at six and 21 days after landing) physical performance from a six-month mission to ISS are described...
January 2017: Musculoskelet Sci Pract
https://www.readbyqxmd.com/read/28170449/a-systematic-review-of-surface-electromyography-analyses-of-the-bench-press-movement-task
#17
Petr Stastny, Artur Gołaś, Dusan Blazek, Adam Maszczyk, Michał Wilk, Przemysław Pietraszewski, Miroslav Petr, Petr Uhlir, Adam Zając
BACKGROUND: The bench press exercise (BP) plays an important role in recreational and professional training, in which muscle activity is an important multifactorial phenomenon. The objective of this paper is to systematically review electromyography (EMG) studies performed on the barbell BP exercise to answer the following research questions: Which muscles show the greatest activity during the flat BP? Which changes in muscle activity are related to specific conditions under which the BP movement is performed? STRATEGY: PubMed, Scopus, Web of Science and Cochrane Central Register of Controlled Trials (CENTRAL) in the Cochrane Library were searched through June 10, 2016...
2017: PloS One
https://www.readbyqxmd.com/read/28167185/the-bench-press-the-most-misunderstood-lift-in-strength-conditioning
#18
Brian Carroll, D C Craig Liebenson
No abstract text is available yet for this article.
January 2017: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/28166187/evaluating-upper-body-strength-and-power-from-a-single-test-the-ballistic-push-up
#19
Ran Wang, Jay R Hoffman, Eliahu Sadres, Sandro Bartolomei, Tyler W D Muddle, David H Fukuda, Jeffrey R Stout
PURPOSE: The purpose of this study was to examine the reliability of the ballistic push-up (BPU) exercise, and to develop a prediction model for both maximal strength (1RM) in the bench press exercise and upper body power. METHODS: Sixty recreationally-active men completed a 1RM bench press and two BPU assessments in three separate testing sessions. Peak and mean force, peak and mean rate of force development, net impulse, peak velocity, flight time, and peak and mean power were determined...
February 1, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28149422/comparison-of-oxygen-uptake-during-and-after-the-execution-of-resistance-exercises-and-exercises-performed-on-ergometers-matched-for-intensity
#20
José Vilaça-Alves, Nuno Miguel Freitas, Francisco José Saavedra, Christopher B Scott, Victor Machado Dos Reis, Roberto Simão, Nuno Garrido
The aim of this study was to compare the values of oxygen uptake (VO2) during and after strength training exercises (STe) and ergometer exercises (Ee), matched for intensity and exercise time. Eight men (24 ± 2.33 years) performed upper and lower body cycling Ee at the individual's ventilatory threshold (VE/VCO2). The STe session included half squats and the bench press which were performed with a load at the individual blood lactate concentration of 4 mmol/l. Both sessions lasted 30 minutes, alternating 50 seconds of effort with a 10 second transition time between upper and lower body work...
December 1, 2016: Journal of Human Kinetics
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