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https://www.readbyqxmd.com/read/29474465/strength-improvements-through-occlusal-splints-the-effects-of-different-lower-jaw-positions-on-maximal-isometric-force-production-and-performance-in-different-jumping-types
#1
Christian Maurer, Sebastian Heller, Jil-Julia Sure, Daniel Fuchs, Christoph Mickel, Eileen M Wanke, David A Groneberg, Daniela Ohlendorf
OBJECTIVE: The influence of the jaw position on postural control, body posture, walking and running pattern has been reported in the literature. All these movements have in common that a relatively small, but well controlled muscle activation is required. The induced effects on motor output through changed jaw positions have been small. Therefore, it has been questioned if it could still be observed in maximal muscle activation. METHOD: Twenty-three healthy, mid age recreational runners (mean age = 34...
2018: PloS One
https://www.readbyqxmd.com/read/29472742/effects-of-high-intensity-interval-training-on-body-composition-aerobic-and-anaerobic-performance-and-plasma-lipids-in-overweight-obese-and-normal-weight-young-men
#2
Nejmeddine Ouerghi, Mohamed Kacem Ben Fradj, Ikram Bezrati, Marwa Khammassi, Moncef Feki, Naziha Kaabachi, Anissa Bouassida
To examine the effects of short high-intensity interval training (HIIT) on body composition, physical performance and plasma lipids in overweight/obese compared to normal-weight young men. Nine overweight/obese and nine normal-weight men (control group) aged 17 to 20 years underwent a HIIT programme three times per week for eight weeks. Body composition, indices of aerobic [maximal aerobic velocity (MAV) and maximal oxygen uptake (VO2max )] and anaerobic [squat jump (SJ), counter-movement jump (CMJ), five-jump test (FJT), 10-m and 30-m sprint] performances, as well as fasting plasma lipids, were assessed in the two groups at PRE and POST HIIT...
December 2017: Biology of Sport
https://www.readbyqxmd.com/read/29464367/inalambric-biofeedback-devices-to-analyze-strength-manifestation-in-military-population
#3
Rosa Delgado-Moreno, José Juan Robles-Pérez, Susana Aznar, Vicente Javier Clemente-Suarez
The study of the effect of stress on both combatants physiological and anatomical systems have been poor studied in the specific literature. The present research aimed to study the effect of combat stress in strength manifestations of leg flexor-extensor muscles and the anaerobic metabolism of soldiers. Before and after asymmetrical combat simulation were analyzed parameters of blood lactate concentration, explosive leg strength manifestation and contractile capacity of leg muscle in 186 professional soldiers...
February 20, 2018: Journal of Medical Systems
https://www.readbyqxmd.com/read/29461420/the-effect-of-ibuprofen-on-muscle-hematological-and-renal-function-hydric-balance-pain-and-performance-during-intense-long-distance-running
#4
Raphael Fabricio de Souza, Dihogo Gama de Matos, Alexandre Reis Pires Ferreira, Philip Chilibeck, Natalie de Almeida Barros, Alan Santos de Oliveira, Luana Mendonça Cercato, Danielle Soares da Silva, Felipe José Aidar
The aim of this study was to investigate the effect of prophylactic use of nonsteroidal anti-inflammatory drugs (NSAID, i.e. Ibuprofen) on physical performance, vertical jump, muscle biomarkers, liver, kidney, acute pain and hydration status of participants in the 42 km Trail Running Challenge, a long-distance race integrated over mountain routes. The sample consisted of 20 males randomly divided into two groups: a control group (CG) and an experimental group (EG) with 12 completing the race (41.1±8.8 y; 75...
February 14, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29443822/power-to-strength-ratio-influences-performance-enhancement-with-contrast-training
#5
Knut Thomas Schneiker, Jackson James Fyfe, Francois Billaut, David John Bishop
PURPOSE: The effectiveness of contrast training (CST) for improving explosive exercise performance is modulated by various individual characteristics; however, further work is required to define these factors. METHODS: Sub-elite male Australian Football players [n = 22; age, 19 ± 2 y; body mass, 80.4 ± 9.4 kg; one-repetition maximum (1-RM) half squat, 172 ± 18 kg; mean ± SD] completed two experimental trials involving two sets of squat jumps (6 repetitions at 30% 1-RM) performed either alone (CTL condition) or after half squats (6 repetitions at 85% 1-RM; CST condition)...
February 13, 2018: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29420390/specific-adaptations-in-performance-and-muscle-architecture-after-weighted-jump-squat-vs-body-mass-squat-jump-training-in-recreational-soccer-players
#6
Giuseppe Coratella, Marco Beato, Chiara Milanese, Stefano Longo, Eloisa Limonta, Susanna Rampichini, Emiliano Cè, Angela Valentina Bisconti, F Schena, F Esposito
The aim of the present study was to compare the effects of weighted jump squat (WJST) vs body mass squat jump training (BMSJT) on quadriceps muscle architecture, lower-limb lean-mass (LM) and muscle strength, performance in change of direction (COD), sprint and jump in recreational soccer-players. Forty-eight healthy soccer-players participated in an off-season randomized controlled-trial. Before and after an eight-week training intervention, vastus lateralis pennation angle, fascicle length, muscle thickness, LM, squat 1-RM, quadriceps and hamstrings isokinetic peak-torque, agility T-test, 10 and 30m sprint and squat-jump (SJ) were measured...
February 6, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29401202/effects-of-different-plyometric-training-frequency-on-measures-of-athletic-performance-in-prepuberal-male-soccer-players
#7
Raja Bouguezzi, Helmi Chaabene, Yassine Negra, Rodrigo Ramirez-Campillo, Zied Jlalia, Bessem Mkaouer, Younés Hachana
This study aimed to compare the effects of one vs. two sessions of equal-weekly volume plyometric training (PT) across 8 weeks on measures of athletic performance (i.e., sprint-time, change of direction [CoD], jumping ability, and muscle strength) in prepuberal male soccer players. Thirty participants were randomly assigned either to one session PT group (1SPT [n=15]) or two sessions PT group (2SPT [n=15]). Plyometric training was integrated into their regular soccer training routine. Pre- and post-training tests for the assessment of sprint-time (e...
February 1, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29373431/the-importance-of-strength-and-power-on-key-performance-indicators-in-elite-youth-soccer
#8
Christopher E Wing, Anthony N Turner, Chris J Bishop
The purpose of this investigation was to examine the importance of strength and power in relation to key performance indicators (KPI's) within competitive soccer match play. This was achieved through using an experimental approach where fifteen subjects were recruited from a professional soccer club's scholarship squad during the 2013/14 season. Following anthropometric measures, power and strength were assessed across a range of tests which included the squat jump (SJ), countermovement jump (CMJ), 20 metre (m) sprint and arrowhead change of direction test...
January 24, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29370541/effects-of-lunar-phases-on-short-term-explosive-physical-performance-among-young-trained-athletes
#9
Narimen Yousfi, Mohamed Arbi Mejri, Mehdi Rouissi, Amri Hammami, Montassar Tabben, Anis Chaouachi, Monoem Haddad, Karim Chamari
Beliefs that lunar phases affect human physiology started in ancient times. Research has recently revealed that a physical fitness index increased in sedentary students at the new moon (NM) and full moon (FM) compared to other moon phases. However, the effect of lunar cycle (moon illumination and gravitational pull) on physical performance in athletes was not examined. Therefore, this study aimed to evaluate whether short-term explosive performance can be influenced by the different phases of the lunar cycle...
January 25, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29334674/relationship-between-jumping-abilities-and-skeletal-muscle-architecture-of-lower-limbs-in-humans-systematic-review-and-meta-analysis
#10
J D Ruiz-Cárdenas, J J Rodríguez-Juan, J Ríos-Díaz
The aim of this study was to examine the influence of skeletal muscle architecture (SMA) features measured by 2-D ultrasonography on jumping performance in humans. A systematic review and meta-analysis was conducted, registry number: CRD42016043602. The scientific literature was systematically searched in eight databases, last run on March 14th, 2017. Cross-sectional studies focused on the association between SMA features and vertical jumping performance were selected. A random-effects model was used to analyze the influence of lower-limb SMA and maximal jump height...
January 12, 2018: Human Movement Science
https://www.readbyqxmd.com/read/29334309/effects-of-resisted-sprint-training-on-sprinting-ability-and-change-of-direction-speed-in-professional-soccer-players
#11
Saulo Gil, Renato Barroso, Everton Crivoi do Carmo, Irineu Loturco, Ronaldo Kobal, Valmor Tricoli, Carlos Ugrinowitsch, Hamilton Roschel
Resisted sprint training consists of performing overloaded sprints, which may produce greater effects than traditional sprint training. We compared a resisted sprint training with overload control versus an unresisted sprint training program on performance in soccer players. Eighteen elite athletes were randomly assigned to resisted (RST) or unresisted sprint training protocol (UR). Before and after a 6-week training period, sprinting ability, change of direction speed (COD), vertical jumps (SJ and CMJ), mean power (MP) and mean propulsive power (MPP) at distinct loads were assessed...
January 15, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29326905/neuromuscular-features-in-sprinters-with-cerebral-palsy-case-studies-based-on-paralympic-classification
#12
Diego Antunes, Mateus Rossato, Rafael Lima Kons, Raphael Luiz Sakugawa, Gabriela Fischer
Despite the evolution of runner performance in athletes with cerebral palsy (CP), little is known about neuromuscular parameters of sprinters from different classes, especially related to power output, muscular imbalances and asymmetry indexes in lower limbs. The aim of this study was to assess muscle power, muscular imbalance and asymmetry in sprinters with CP. Four male sprinters with CP (age, 18 to 27 years; body mass, 58.5 to 72.8 kg; height, 161.5 to 174 cm) classified as T38, T37, T36, T35 according to International Paralympic Committee functional classification, performed vertical counter movement jump and squat jump on force plate and isokinetic torque evaluations in both limbs...
December 2017: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/29318166/lower-limb-symmetry-comparison-of-muscular-power-between-dominant-and-nondominant-legs-in-healthy-young-adults-associated-with-single-leg-dominant-sports
#13
Alex Vaisman, Rodrigo Guiloff, Juan Rojas, Iris Delgado, David Figueroa, Rafael Calvo
Background: Achieving a symmetrical power performance (difference <15%) between lower limbs is generally recommended during sports rehabilitation. However, athletes in single-leg-dominant sports, such as professional soccer players, could develop significant asymmetry between their dominant and nondominant legs, such that symmetry does not act as a viable comparison. Purpose: To (1) compare maximal muscular power between the dominant and nondominant legs in healthy young adults, (2) evaluate the effect of a single-leg-dominant sport activity performed at the professional level, and (3) propose a parameter of normality for maximal power difference in the lower limbs of this young adult population...
December 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29300147/relationships-between-highly-skilled-golfers-clubhead-velocity-and-force-producing-capabilities-during-vertical-jumps-and-an-isometric-mid-thigh-pull
#14
Jack E T Wells, Andrew C S Mitchell, Laura H Charalambous, Iain M Fletcher
Whilst previous research has highlighted significant relationships between golfers' clubhead velocity (CHV) and their vertical jump height and maximum strength, these field-based protocols were unable to measure the actual vertical ground reaction force (vGRF) variables that may correlate to performance. The aim of this study was to investigate relationships between isometric mid-thigh pull (IMTP), countermovement jump (CMJ), squat jump (SJ) and drop jump (DJ) vGRF variables and CHV in highly skilled golfers...
January 4, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29284166/functional-screening-tests-interrelationships-and-ability-to-predict-vertical-jump-performance
#15
Irineu Loturco, Lucas Adriano Pereira, Ronaldo Kobal, Cesar Cavinato Cal Abad, William Komatsu, Ronaldo Cunha, Gustavo Arliani, Benno Ejnisman, Alberto de Castro Pochini, Fábio Yuzo Nakamura, Moises Cohen
There are several methods used in sports science to identify asymmetries in athletes, given their purported relevance to injury prevention and performance optimization. We aimed to verify whether asymmetries provided by isokinetic assessments, jump tests, and tensiomyography (TMG) are associated with each other, and whether their respective functional indices are related to jumping ability. TMG parameters, unilateral and bilateral squat-jump (SJ) and countermovement-jump (CMJ) performances, and peak torque in knee-extension and flexion with angular velocities of 60o/s and 300o/s for twenty-four soccer players were retained for analyses...
December 28, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29283690/how-fast-is-a-horizontal-squat-jump
#16
Pierre Samozino, Jean Romain Riviere, Jérémy Rossi, Jean-Benoit Morin, Pedro Jimenez-Reyes
Velocity strength training requires exercise modalities allowing athletes to reach very high movement velocity, which is limited during vertical movements involving body weight. PURPOSE: Our aim was to quantify the mechanical outputs developed during horizontal squat jumps, and notably the movement velocity, in comparison to vertical squat jumps with and without loads. METHODS: Thirteen healthy male athletes performed squat jumps without additional loads (SJ0), with a load of ~60% of body mass (SJ60) and during horizontal squat jumps performed lying down on a roller device with (AHSJ) and without (HSJ) a rubber band assistance...
December 28, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29239991/a-multiple-repeated-sprint-ability-test-with-four-changes-of-direction-for-badminton-players-part-2-predicting-skill-level-with-anthropometry-strength-shuttlecock-and-displacement-velocity
#17
Michael Phomsoupha, Guillaume Laffaye
The goal of this study was: (i) to assess general and specific lower and upper limb force, shuttlecock velocity, displacement ability and the anthropometric characteristics of badminton players at five skill levels, and (ii) to predict individual players' number of points. We divided 83 participants into groups of novice (n=15), intermediate (n=16), skilled (n=23), highly skilled (n=14) and elite (n=15) players. The number of points scored for each player performing tournaments (excluding novices) during the entire season was used as a continuous and dependent variable after logarithmic transformation for correlational study...
December 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29228409/short-term-effects-of-combined-high-intensity-strength-and-sprint-interval-training-on-anthropometric-characteristics-and-physical-performance-of-elite-team-handball-players
#18
Souhail Hermassi, Mohamed Souhail Chelly, Georg Fieseler, Thomas Bartels, Stephan Schulze, Karl-Stefan Delank, Roy J Shepard, René Schwesig
Muscular strength and speed are critical physical factors in determining the technical and tactical skills of elite team handball players. This study thus investigated the effect of high-intensity muscular strength and sprint interval training (SIT) on lower limb explosive performance and anthropometric characteristics in 22 male handball athletes aged 20.2 ± 0.1 years. A training group (TG, n = 12) and a control group (CG, n = 10) were followed over 8 weeks parallel to regular handball training...
December 2017: Sportverletzung Sportschaden: Organ der Gesellschaft Für Orthopädisch-Traumatologische Sportmedizin
https://www.readbyqxmd.com/read/29227735/effect-of-8-weeks-of-concurrent-plyometric-and-running-training-on-spatiotemporal-and-physiological-variables-of-novice-runners
#19
Josué Gómez-Molina, Ana Ogueta-Alday, Jesus Camara, Christopher Stickley, Juan García-López
Concurrent plyometric and running training has the potential to improve running economy (RE) and performance through increasing muscle strength and power, but the possible effect on spatiotemporal parameters of running has not been studied yet. The aim of this study was to compare the effect of 8 weeks of concurrent plyometric and running training on spatiotemporal parameters and physiological variables of novice runners. Twenty-five male participants were randomly assigned into two training groups; running group (RG) (n = 11) and running + plyometric group (RPG) (n = 14)...
December 11, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/29200094/characteristics-of-a-national-level-female-weightlifter-peaking-for-competition-a-case-study
#20
Caleb D Bazyler, Satoshi Mizuguchi, Michael C Zourdos, Kimitake Sato, Ashley A Kavanaugh, Brad H DeWeese, Kevin F Breuel, Michael H Stone
This study investigated physiological and performance changes of a national level 69kg female weightlifter following three competition phases over a 28-week training period. The athlete first trained for a regional championship (weeks 1-12), followed by a local competition (weeks 13-23) and the national championship (weeks 24-28). Body mass, vastus lateralis cross-sectional area, and unloaded and loaded squat jump performance were assessed weekly during each 4-week competition phase. Serum biomarkers, and dynamic mid-thigh pulls were assessed prior to and after each competition phase...
December 1, 2017: Journal of Strength and Conditioning Research
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