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Repetition maximum

Andrew T Askow, Jason D Stone, Daniel J Arndts, Adam C King, Shiho Goto, Joseph P Hannon, J Craig Garrison, James M Bothwell, Phil E Esposito, Andrew R Jagim, Margaret T Jones, Will Jennings, Jonathan M Oliver
Given the relationship between explosive-type training and power adaptation, tracking movement velocity has become popular. However, unlike previous variables, tracking velocity necessitates the use of a valid and reliable tool to monitor adaptation over time. Therefore, the primary purpose of this research was to assess the validity and reliability of a commercially-available linear position transducer (LPT). Nine resistance-trained men completed four sessions consisting of a single set of barbell back squat to volitional failure at 75% or 90% one-repetition maximum...
December 10, 2018: Sports
Derek D Ferley, Matthew D Vukovich
Ferley, DD and Vukovich, MD. Assessing the reliability of using a horizontal leg press equipped with a force plate to report on measures of positive and negative neuromuscular characteristics. J Strength Cond Res XX(X): 000-000, 2018-Individuals participating in sport or returning from a lower-extremity injury routinely perform assessments of lower-body anaerobic capacity and power to gauge fitness or readiness to return to competition. However, many commonly used assessments lack the specificity of movement and muscle contraction demonstrated in sprinting, jumping, and changing direction...
December 7, 2018: Journal of Strength and Conditioning Research
Christopher G Ballmann, Marquis J McCullum, Rebecca R Rogers, Mallory M Marshall, Tyler D Williams
Ballmann, CG, McCullum, MJ, Rogers, RR, Marshall, MM , and Williams, TD. Effects of preferred vs. nonpreferred music on resistance exercise performance. J Strength Cond Res XX(X): 000-000, 2018-The purpose of this study was to examine the effects of listening to preferred vs. nonpreferred music on resistance exercise performance. Twelve resistance-trained college-aged males (age = 20.5 ± 1.24 years, height = 183.9 ± 6.8 cm, and body mass = 97.0 ± 18.2 kg) were recruited for this study. In a within-groups counterbalanced study design, participants either listened to preferred or nonpreferred music during a bench press exercise test...
December 7, 2018: Journal of Strength and Conditioning Research
Eliseo Iglesias-Soler, Xian Mayo, Jéssica Rial-Vázquez, Guy G Haff
The main aim of this study was to explore the variability in the load-velocity relationship through the use of multilevel mixed regression models. The relationship between relative load (% of one repetition maximum: %1RM) and velocity was obtained in a sample of high-level judokas and rugby players (8 women and 13 men) for the bench press (BP) and parallel squat (SQ). The load-velocity relationship for the squat was obtained for the external load (barbell load) and for the system mass (barbell plus body mass)...
December 11, 2018: Sports Biomechanics
Amador García-Ramos, Alejandro Pérez-Castilla, Francisco Javier Villar Macias, Pedro Á Latorre-Román, Juan A Párraga, Felipe García-Pinillos
This study aimed to compare the one-repetition maximum (1RM) and the velocity outcomes obtained against the same absolute and relative (%1RM) loads between the flat and arched bench press (BP) variants. Eleven competitive male powerlifters were evaluated in one session with the flat BP (natural lumbar arch and moderate scapular retraction) and in another session with the arched BP (pronounced lumbar arch and scapular retraction). An incremental loading test was used to determine the 1RM as well as the barbell's velocity against the different external loads...
December 11, 2018: Sports Biomechanics
Kevin T Mattocks, J Grant Mouser, Matthew B Jessee, Scott J Dankel, Samuel L Buckner, Zachary W Bell, Takashi Abe, Jeremy P Loenneke
OBJECTIVE: To examine the acute changes in blood flow and blood pressure of very low load knee extensor exercise (15% one repetition maximum (1RM)) with and without different levels of applied pressure to determine how these effects might differ from high load exercise. We also sought to examine if this differed between men and women. APPROACH: A total of 90 participants (45 men, 45 women) were randomized into a very low load condition with no restriction 15/0, (n=21), a very low load condition with 40% arterial occlusion pressure (15/40, n=23), a very low load condition with 80% arterial occlusion pressure (15/80, n=22), and a traditional high load condition (70/0, n=24)...
November 9, 2018: Physiological Measurement
Delano Gurgel Silveira, Márcio Alencar Barreira, Luiz Gonzaga de Moura Junior, Charles Jean Gomes de Mesquita, Hermano Alexandre Lima Rocha, Gleydson Cesar de Oliveira Borges
PURPOSE: To discuss the use of models of hepatic retraction by laparoscopy, to present a new Hepatic Retractor (HR) and to evaluate its practicality, efficacy and safety in Esophageal Hiatus Exposure (EHE). METHODS: Experimental cross - sectional study with a quantitative character. It was carried out in the Laboratory of Health Training of Christus University Center. The sample consisted of 12 livers of adult pigs weighing between 30 and 45 kg. A circular-shaped HR, 5 cm diameter and deformable materials was developed with a polypropylene cloth, metallic guide wire, epidural needle plastic guide and nylon string...
November 2018: Acta Cirúrgica Brasileira
Loumaíra C Cruz, Alfredo A Teixeira-Araujo, Karoline T Passos Andrade, Thaise Camila O Gomes Rocha, Guilherme Morais Puga, Sérgio R Moreira
The study herein aimed to compare glucose concentration and hyperglycemic responses of 24-hours after resistance exercise (RE) performed in different intensities in patients with type-2 diabetes (T2D). Twelve women with T2D (55.2±4.0 years; 70.1±11.4 kg; 155.7±3.3 cm) performed four experimental sessions divided into two blocks separated by 7 days and in randomized order: block-A (session-1: control-CONT40% and session-2: RE40% of one repetition maximum test-1RM) and block-B (session-3: CONT80% and session-4: RE80%1RM)...
December 18, 2017: Journal of Strength and Conditioning Research
Therese Fostervold Mathisen, Jorunn Sundgot-Borgen, Jan H Rosenvinge, Solfrid Bratland-Sanda
Persons with bulimia nervosa (BN) or binge eating disorder (BED) have an elevated risk of non-communicable diseases (NCDs). However, lowering this risk is rarely addressed in standard cognitive-behavioral treatment (CBT). We aimed to compare CBT with an intervention combining physical exercise and dietary therapy (PED-t), and hypothesized that the PED-t would do better than CBT in lowering the risk of NCD both initially and longitudinally. In this study, 164 women with bulimia nervosa or binge eating disorder were randomly assigned to 16-weeks of outpatient group therapy with either PED-t or CBT...
December 3, 2018: Nutrients
Sungil Kim, Jeongtae Kim, Yeun-Ho Joung, Jiyeon Choi, Chiwan Koo
We present a rapid and highly reliable glass (fused silica) microfluidic device fabrication process using various laser processes, including maskless microchannel formation and packaging. Femtosecond laser assisted selective etching was adopted to pattern microfluidic channels on a glass substrate and direct welding was applied for local melting of the glass interface in the vicinity of the microchannels. To pattern channels, a pulse energy of 10 μJ was used with a scanning speed of 100 mm/s at a pulse repetition rate of 500 kHz...
December 3, 2018: Micromachines
Marcelo Conrado de Freitas, Fabricio Eduardo Rossi, Lucas Antônio Colognesi, João Vitor N S de Oliveira, Nelo Eidy Zanchi, Fabio Santos Lira, Jason M Cholewa, Luís Alberto Gobbo
Conrado de Freitas, M, Rossi, FE, Colognesi, LA, de Oliveira, JVNS, Zanchi, NE, Lira, FS, Cholewa, JM, and Gobbo, LA. Postactivation potentiation improves acute resistance exercise performance and muscular force in trained men. J Strength Cond Res XX(X): 000-000, 2018-The purpose of this study was to investigate the effects of heavy back squat (90% one repetition maximum [1RM]) postactivation potentiation (PAP) on acute resistance exercise performance and force production in recreationally trained men, and to verify the relationship between maximal strength and the PAP response...
November 29, 2018: Journal of Strength and Conditioning Research
Edvard H Sagelv, Tina P Engseth, Sigurd Pedersen, Svein A Pettersen, Gunnar Mathisen, Kim A Heitmann, Boye Welde, Tor O Thomassen, Thomas L Stöggl
Longer distance cross-country ski (14-220 km) races such as the Visma Ski Classics (VSC) has recently gained attention in addition to the traditional Olympic distances (5-50 km) associated with cross-country (XC) skiing. These long-distance races are characterized by extensive use of the upper body while double poling (DP). While there is a substantial amount of research on Olympic distance XC skiing, the physiological capacities of VSC skiers has not yet been explored. We recruited seven elite male VSC skiers and seven well-trained national level male XC skiers to undergo three tests in the laboratory: (1) a one repetition maximum (1RM) strength test in a cable pulldown; (2) roller skiing tests on a treadmill (10...
2018: Frontiers in Physiology
Sarkawt Kolahdouzi, Mohammad Baghadam, Farhad Ahmadi Kani-Golzar, Ayoub Saeidi, Georges Jabbour, Amani Ayadi, Maysa De Sousa, Amira Zouita, Abderraouf Ben Abderrahmane, Hassane Zouhal
BACKGROUND: Circuit resistance training (CRT) is a time-efficient exercise modality for improving skeletal muscle and cardiovascular fitness. But the beneficial role of CRT in obese individuals is still not well understood. This study explores the reducing effects of progressive CRT on inflammatory biomarkers and cardiometabolic risk factors in obese young men. METHODS: Thirty obese men (Body mass index (BMI): 30.67 ± 3.06; age: 23 ± 3.2 years) were divided into CRT and control groups...
November 29, 2018: Physiology & Behavior
Cosima Prahm, Fares Kayali, Agnes Sturma, Oskar Aszmann
BACKGROUND: Prosthetic motor rehabilitation usually relies on the highly repetitive training of movements. Patients might drop out of training because the rehabilitation process is long and often discouraging. Game-based interventions provide a potentially useful alternative to standard myoelectric (electromyographic [EMG]) training and can increase engagement with training. OBJECTIVE: To assess the short-term impact of a game-based rehabilitation protocol on parameters for EMG control, evaluate how game-based interventions affect patient motivation, performance, and effort, and compare the game-based intervention with a standard tool in rehabilitation (MyoBoy)...
November 2018: PM & R: the Journal of Injury, Function, and Rehabilitation
Tzu Lin Huang, Shu Ching Li, Chia Han Tsou, Hsing Chih Liang, K F Huang, Yung Fu Chen
A novel scheme to realize a mode-locked laser with a narrow spectral linewidth is demonstrated by exploiting a reflected Fabry-Perot (FP) cavity to introduce an intense FP effect. Stable continuous-wave mode-locked operation is achieved with the repetition rate of 48 MHz and the maximum average output power of 2.6 W under an incident pump power of 11.9 W. The mode-locked pulse width is systematically investigated by varying the optical thickness of the reflected FP cavity. The pulse duration is experimentally found to be in a range of 0...
December 1, 2018: Optics Letters
Jan-Frieder Harmsen, Alexander Franz, Constantin Mayer, Christoph Zilkens, Bettina Alexandra Buhren, Holger Schrumpf, Rüdiger Krauspe, Michael Behringer
PURPOSE: The tensiomyography (TMG) technique is increasingly used to determine muscle contractile properties in exercise and injury management. The present study investigated the informative value of TMG parameters in correlation with commonly used (creatine kinase, CK; myoglobin, Mb) and novel candidate biomarkers of muscle damage (heart-type fatty acid-binding protein, h-FABP; high-mobility group box 1, HMGB1). METHODS: Ten untrained men performed 6 × 10 eccentric contractions of the elbow flexors at 110% of the concentric one repetition maximum...
November 29, 2018: European Journal of Applied Physiology
James P Fisher, Charlotte Stuart, James Steele, Paulo Gentil, Jürgen Giessing
Objectives: Muscles dominant in type I muscle fibres, such as the lumbar extensors, are often trained using lighter loads and higher repetition ranges. However, literature suggests that similar strength adaptations can be attained by the use of both heavier- (HL) and lighter-load (LL) resistance training across a number of appendicular muscle groups. Furthermore, LL resistance exercise to momentary failure might result in greater discomfort. Design: The aims of the present study were to compare strength adaptations, as well as perceptual responses of effort (RPE-E) and discomfort (RPE-D), to isolated lumbar extension (ILEX) exercise using HL (80% of maximum voluntary contraction; MVC) and LL (50% MVC) in healthy males and females...
2018: PeerJ
Lucia Capano, Annie Dupuis, Jessica Brian, Deepali Mankad, Lisa Genore, Rianne Hastie Adams, Sharon Smile, Toni Lui, Dina Odrobina, Jane A Foster, Evdokia Anagnostou
Background: Pioglitazone is a promising compound for treatment of core autism spectrum disorder (ASD) symptoms as it targets multiple relevant pathways, including immune system alterations. Objective: This pilot study aimed to elucidate the maximum tolerated dose, safety, preliminary evidence of efficacy, and appropriate outcome measures in autistic children ages 5-12 years old. Methods: We conducted a 16-week prospective cohort, single blind, single arm, 2-week placebo run-in, dose-finding study of pioglitazone...
2018: Molecular Autism
Logan E Miller, Jillian E Urban, Mireille E Kelley, Alexander K Powers, Christopher T Whitlow, Joseph A Maldjian, Steven Rowson, Joel D Stitzel
During normal participation in the sport, football players are exposed to repetitive subconcussive head impacts, or impacts that do not result in signs and symptoms of concussion. To better understand the effects of repetitive subconcussive impacts, the biomechanics of on-field head impacts and resulting brain deformation needs to be well-characterized. The current study evaluates local brain response to typical youth football head impacts using the atlas-based brain model (ABM), an anatomically-accurate brain finite element (FE) model...
November 29, 2018: Journal of Neurotrauma
Matheus Barbalho, Victor Silveira Coswig, Rodolfo Raiol, James Steele, James Fisher, Antonio Paoli, Paulo Gentil
BACKGROUND: The present study's aim was to compare the changes in muscle performance and anthropometric measures in trained women performing RT programs composed only of MJ exercises or programmes that involve the addition of SJ exercises. METHODS: Seventeen trained women were randomised to MJ or MJ+SJ. Both groups performed the same MJ exercises following a nonlinear periodisation model for 8 weeks. The only difference was that the MJ+SJ group also performed SJ exercises...
November 28, 2018: Sports
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