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https://www.readbyqxmd.com/read/28530478/validity-of-a-linear-velocity-transducer-for-testing-maximum-vertical-jumps
#1
Alejandro Pérez-Castilla, Belén Feriche, Slobodan Jaric, Paulino Padial, Amador García-Ramos
This study aimed to examine the validity of mechanical variables obtained by a linear velocity transducer from the unconstrained and constrained squat jump (SJ). Twenty-three men were tested on the unconstrained SJ and the SJ constrained by a Smith machine. Maximum values of force, velocity, and power were simultaneously recorded both by a linear velocity transducer attached to a bar of mass of 17, 30, 45, 60 and 75 kg and by a force plate. Linear velocity transducer generally overestimated the outcomes measured as compared to the force plate, particularly in unconstrained SJ...
May 22, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28530475/a-novel-electromyographic-approach-to-estimate-fatigue-threshold-in-maximum-incremental-strength-tests
#2
Jerónimo Aragón-Vela, Yaira Barranco-Ruiz, Cristina Casals, Julio Plaza-Díaz, Rafael A Casuso, Luis Fontana, Jesus R Huertas
Evaluation of muscular fatigue thresholds in athletes performing short-duration and explosive exercises is difficult due to the fact that classic parameters do not suffer large variations. Therefore, the aim of this study was to develop a new method to estimate the fatigue threshold in single muscles. Our approach is based on electromyographic data recorded during a maximun incremental strength test until the one repetition maximum (1RM) is reached. Ten men and ten women performed a half-squat strength test consisting of five incremental intensities of 1RM...
May 22, 2017: Motor Control
https://www.readbyqxmd.com/read/28530448/carbohydrates-alone-or-mixing-with-beef-or-whey-protein-promote-similar-training-outcomes-in-resistance-training-males-a-double-blind-randomized-controlled-clinical-trial
#3
Fernando Naclerio, Marco Seijo-Bujia, Eneko Larumbe-Zabala, Conrad P Earnest
Beef powder is a new high-quality protein source scarcely researched relative to exercise performance. The present study examined the impact of ingesting hydrolyzed beef protein, whey protein, and carbohydrate on strength performance (1RM), body composition (via plethysmography), limb circumferences and muscular thickness (via ultrasonography), following an 8-week resistance-training program. After being randomly assigned to one of the following groups: Beef, Whey, or Carbohydrate, twenty four recreationally physically active males (n=8 per treatment) ingested 20 g of supplement, mixed with orange juice, once a day (immediately after workout or before breakfast)...
May 22, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28528435/benefits-of-a-regular-vs-irregular-rhythm-based-training-programme-on-physical-fitness-and-motor-skills-in-obese-girls
#4
Ghazi Racil, Wassim Elmontassar, Imen Rommene, Claire Tourny, Anis Chaouachi, Jeremy B Coquart
PURPOSE: The aim of the current study was to examine the impact of a physical exercise programme including rhythmic elements (regular and irregular tempos) on physiological variables, motor skills (MS), and jump performances in obese girls. METHODS: Thirty-six obese girls (age: 10.4 ± 0.9 years, body mass: 58.7 ± 4.0 kg, height: 1.37 ± 0.04 m, body mass index: 31.2 ± 2.1) participated in three weekly physical exercise sessions for 6 weeks, with each session consisting of basic fundamental locomotor movements...
May 20, 2017: Journal of Endocrinological Investigation
https://www.readbyqxmd.com/read/28515971/prediction-of-functional-movement-screen%C3%A2-performance-from-lower-extremity-range-of-motion-and-core-tests
#5
Nicole J Chimera, Shelby Knoeller, Ron Cooper, Nicholas Kothe, Craig Smith, Meghan Warren
BACKGROUND: There are varied reports in the literature regarding the association of the Functional Movement Screen™ (FMS™) with injury. The FMS™ has been correlated with hamstring range of motion and plank hold times; however, limited research is available on the predictability of lower extremity range of motion (ROM) and core function on FMS™ performance. PURPOSE/HYPOTHESES: The purpose of this study was to examine whether active lower extremity ROM measurements and core functional tests predict FMS™ performance...
April 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28515970/two-dimensional-video-analysis-is-comparable-to-3d-motion-capture-in-lower-extremity-movement-assessment
#6
Stacy A Schurr, Ashley N Marshall, Jacob E Resch, Susan A Saliba
BACKGROUND: Although 3D motion capture is considered the "gold standard" for recording and analyzing kinematics, 2D video analysis may be a more reasonable, inexpensive, and portable option for kinematic assessment during pre-participation screenings. Few studies have compared quantitative measurements of lower extremity functional tasks between 2D and 3D. PURPOSE: To compare kinematic measurements of the trunk and lower extremity in the frontal and sagittal planes between 2D video camera and 3D motion capture analyses obtained concurrently during a SLS...
April 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28513281/short-term-effects-of-kinesio-taping-on-muscle-recruitment-order-during-a-vertical-jump-a-pilot-study
#7
Guillermo Mendez-Rebolledo, Rodrigo Ramirez-Campillo, Eduardo Guzman-Muñoz, Valeska Gatica-Rojas, Alexis Dabanch-Santis, Francisco Diaz-Valenzuela
CONTEXT: Kinesio taping is commonly used in sports and rehabilitation settings with the aim of prevention and treatment of musculoskeletal injuries. However, limited evidence exists regarding the effects of 24 and 72 h of kinesio taping on trunk and lower limb neuromuscular and kinetic performance during a vertical jump. OBJECTIVE: The purpose of this study was to analyze the short-term effects of kinesio taping on the height and ground reaction force during a vertical jump, in addition to trunk and lower limb muscle latency and recruitment order...
May 17, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28513179/consumption-of-watermelon-juice-enriched-in-l-citrulline-and-pomegranate-ellagitannins-enhanced-metabolism-during-physical-exercise
#8
Ascension Martinez-Sanchez, Fernando Alacid, Jacobo A Rubio-Arias, Bárbara Fernandez-Lobato, Domingo J Ramos-Campo, Encarna Aguayo
L-citrulline is a non-essential amino acid precursor of arginine and indirectly a precursor of nitric oxide (NO), which is a vasodilator and increases mitochondrial respiration. On the other hand, the antioxidant pomegranate ellagitannins are precursors of urolithin A, which has been associated with mitophagy and increased muscle function. To elucidate if a single dose of watermelon enrichment with these compounds have a positive effect after a high intensity exercise (8 sets of 8 repetitions of half squat exercise), a double-blind randomized crossover in vivo study was performed in healthy male subjects (n=19)...
May 17, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28511496/effect-of-passive-active-and-combined-warm-up-on-lower-limb-muscle-performance-and-dynamic-stability-in-recreational-sports-players
#9
Kedar Gogte, Prateek Srivastav, Ganesh Balthillaya Miyaru
INTRODUCTION: Warm up is an activity that is done before a sports activity. The warm up can be done actively and passively. The preferred mode is active warm up in athletes. There are inconclusive effects of passive warm up compared with an active warm up on short term muscle performance. The cumulative effect of passive and active warm up on muscle performance and dynamic stability is not known. AIM: To find out the effects of passive, active and combined warm up on lower limb muscle performance and dynamic stability in recreational sports players...
March 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28507967/surgery-of-a-rare-case-of-multiple-synovial-osteochondromatosis-of-the-hip-joint
#10
Yi Min Zhang, Xiaoguang Liu
INTRODUCTION: Primary synovial osteochondromatosis of the hip is a benign disorder, which is not frequently seen clinically. The characteristic of this disease is proliferation of synovium and formation of loose bodies inside the joint. It is known that only the loose bodies derived from synovium were called synovial osteochondromatosis. Although it can take place in any joint, the knee is most commonly affected, involvement of the hip joint is relatively rare. We report a young man who has multiple synovial osteochondromatosis in his left hip...
November 2016: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28503527/postactivation-potentiation-in-elite-young-soccer-players
#11
Adriano Titton, Emerson Franchini
The aim of this study was to investigate the acute effects of 16 different combinations to cause the postactivation potentiation (PAP) in elite young soccer players. Squat exercise in 4 different intensities (40%, 60%, 80%, and 100% one-repetition maximum [1RM]) was performed and its effects were evaluated in the performance of countermovement jump (CMJ), after 4 different recovery times (1, 3, 5, and 10 min). For this purpose, 25 young soccer players, underwent five experimental sessions. At the first session the control to determine 1RM in half-squat was carried out...
April 2017: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/28500391/anterior-referencing-of-tibial-slope-in-total-knee-arthroplasty-considerably-influences-knee-kinematics-a-musculoskeletal-simulation-study
#12
Marco A Marra, Marta Strzelczak, Petra J C Heesterbeek, Sebastiaan A W van de Groes, Dennis W Janssen, Bart F J M Koopman, Ate B Wymenga, Nico J J Verdonschot
PURPOSE: In total knee arthroplasty (TKA), the posterior tibial slope is not always reconstructed correctly, and the knee ligaments may become too tight in flexion. To release a tight flexion gap, surgeons can increase the posterior tibial slope using two surgical resection techniques: the anterior tibial cortex (ACR) or the centre of tibial plateau (CPR) referencing. It is not known how this choice affects the knee laxity and function during activities of daily living. The aim of this study was to investigate the effect of tibial slope on knee laxity, kinematics and forces during a squatting activity using computer simulation techniques...
May 12, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28497285/comparison-of-periodized-and-non-periodized-resistance-training-on-maximal-strength-a-meta-analysis
#13
REVIEW
Tyler D Williams, Danilo V Tolusso, Michael V Fedewa, Michael R Esco
BACKGROUND: Periodization is a logical method of organizing training into sequential phases and cyclical time periods in order to increase the potential for achieving specific performance goals while minimizing the potential for overtraining. Periodized resistance training plans are proposed to be superior to non-periodized training plans for enhancing maximal strength. OBJECTIVE: The primary aim of this study was to examine the previous literature comparing periodized resistance training plans to non-periodized resistance training plans and determine a quantitative estimate of effect on maximal strength...
May 12, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28489955/isometric-and-dynamic-strength-and-neuromuscular-attributes-as-predictors-of-vertical-jump-performance-in-11%C3%A2-13-year-old-male-athletes
#14
Brandon John McKinlay, Phillip J Wallace, Raffy Dotan, Devon Long, Craig Tokuno, David A Gabriel, Bareket Falk
In explosive contractions, neural activation is a major factor in determining the rate of torque development, while the latter is an important determinant of jump performance. However, the contribution of neuromuscular activation and rate of torque development to jump performance in children and youth is unclear. PURPOSE: To examine the relationships between the rate of neuromuscular activation, peak torque, rate of torque development, and jump performance in young male athletes. METHODS: Forty-one 12...
May 10, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28486339/acute-effect-of-upper-and-lower-body-postactivation-exercises-on-shot-put-performance
#15
Eleni I Kontoy, Fani Berberidou, Theophilos C Pilianidis, Nikolaos I Mantzouranis, Spyridon K Methenitis
The purpose of the present study was to investigate the effect of different types of upper and lower' extremities exercises on acute increase of shot put performance, in moderate experienced throwers. Eight (n=8) males and nine (n=9) female throwers participated in the present study. Their bench press and squat maximum strength were measured while their shot put performance from power position was evaluated before and after four interventions: [1] plyometric push-ups (Plyo), [2] 6s isometric push-ups (Iso), [3] 3 countermovement jumps (CMJ) and [4] 10 reps...
May 10, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28486338/a-comparison-of-load-velocity-and-load-power-relationships-between-well-trained-young-and-middle-aged-males-during-three-popular-resistance-exercises
#16
John F T Fernandes, Kevin L Lamb, Craig Twist
This study examined the load-velocity and load-power relationships among 20 young (age 21.0 ± 1.6 y) and 20 middle-aged (age 42.6 ± 6.7 y) resistance trained males. Participants performed three repetitions of bench press, squat and bent-over-row across a range of loads corresponding to 20 to 80% of one repetition maximum (1RM). Analysis revealed effects (P < 0.05) of group and load x group on barbell velocity for all three exercises, and interaction effects on power for squat and bent-over-row (P < 0...
May 5, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28484791/varus-femoral-and-tibial-coronal-alignments-result-in-different-kinematics-and-kinetics-after-total-knee-arthroplasty
#17
Mutsumi Watanabe, Shinichi Kuriyama, Shinichiro Nakamura, Yoshihisa Tanaka, Kohei Nishitani, Moritoshi Furu, Hiromu Ito, Shuichi Matsuda
PURPOSE: Abnormal knee motion under various conditions has been described after total knee arthroplasty (TKA). However, differences in kinematics and kinetics of knees with varus femoral versus varus tibial alignment have not been evaluated. It was hypothesized that varus femoral and tibial alignments have the same impact on knee motion. METHODS: A musculoskeletal computer simulation was used. Femoral and tibial alignment in the coronal plane was each varied from neutral to 5° of varus in 1° increments...
May 8, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28479431/transient-acute-leg-ischemia-in-a-professional-athlete-caused-by-isolated-popliteal-artery-dissection-mimicking-popliteal-entrapment-syndrome
#18
Milos Sladojevic, Marko Dragas, Igor Končar, Oliver Radmili, Miroslav Markovic, Lazar Davidovic
INTRODUCTION: Exertional leg pain includes a broad range of conditions induced by different vascular, musculoskeletal and neurological disorders. We report a case with isolated popliteal artery dissection as a cause of a transient acute lower limb ischemia. CASE REPORT: We report a patient with popliteal artery dissection which occurred during squatting exercise. After initial signs of transient acute limb ischemia, physical and ultrasound examination pointed to entrampement syndrome as a likely cause...
May 4, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28474651/squat-to-stand-test-in-functional-assessment-of-stable-chronic-obstructive-pulmonary-disease-patients
#19
Prahlad Rai Gupta, Asif Feroz, Sachet Dawar, Harshdeep Bhangoo, Shivani Swami, T K Khublani
BACKGROUND: Assessment of functional status is vital for proper therapy and rehabilitation programs in chronic obstructive pulmonary disease (COPD) patients. Traditionally, 6 min walk test (6MWT) has been used but it by itself may not reflect the total functional status in these patients as it poorly correlates to the disease severity. A sit-to-stand test (STST) has been proposed as a better alternative to 6MWT but to test their ability to stand from the squatting position, i.e., a squat-to-stand test (SqTST) will be more appropriate in rural patients...
May 2017: Lung India: Official Organ of Indian Chest Society
https://www.readbyqxmd.com/read/28473614/lower-limb-explosive-strength-capacity-in-elderly-women-effects-of-resistance-training-and-healthy-diet
#20
Peter Edholm, Emelie Strandberg, Fawzi Kadi
The effects of 24-weeks of resistance training combined with a healthy diet on lower limb explosive strength capacity were investigated in a population of healthy elderly women. Participants (n=63; 67.5 ± 0.4 yrs) were randomized into three groups; resistance training (RT), resistance training and healthy diet (RT-HD) and control (CON). Progressive resistance training was performed at a load of 75%-85% 1 RM. A major adjustment in the healthy dietary approach was an n-6/n-3 PUFA ratio below 2. Lower limb maximal strength, explosive force capacity during dynamic and isometric movements, whole body lean mass and physical function were assessed...
May 4, 2017: Journal of Applied Physiology
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