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https://www.readbyqxmd.com/read/29774921/a-flexible-pressure-sensor-based-on-rgo-polyaniline-wrapped-sponge-with-tunable-sensitivity-for-human-motion-detection
#1
Gang Ge, Yichen Cai, Qiuchun Dong, Yizhou Zhang, Jinjun Shao, Wei Huang, Xiaochen Dong
High-performance stretchable and wearable electronic skins (E-skins) with high sensitivity and a large sensing range are urgently required with the rapid development of the Internet of things and artificial intelligence. Herein, a reduced graphene oxide (rGO)/polyaniline wrapped sponge is prepared via rGO coating and the in situ synthesis of polyaniline nanowires (PANI NWs) on the backbones of sponge for the fabrication of pressure sensors. From the as-prepared flexible sensor, tunable sensitivity (0.042 to 0...
May 18, 2018: Nanoscale
https://www.readbyqxmd.com/read/29772741/changes-in-lumbopelvic-movement-and-muscle-recruitment-associated-with-prolonged-deep-squatting-a-pilot-study
#2
Tim K S Lui, Sharon M H Tsang, Anthony W L Kwok
This study examined the changes in spinal kinematics and muscle recruitment of the lumbopelvic region associated with prolonged squatting. Eight subjects with chronic nonspecific low back pain (LBP) and eight asymptomatic subjects (AS) performed squat-to-stand and reverse movements, before and immediately after 15 min deep-squatting. Within-group and between-group differences in lumbopelvic kinematics and electromyographic activity acquired in lumbar erector spinae (ES), gluteus maximus (GM), and vastus lateralis (VL) were analyzed...
May 16, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29769823/relationship-between-achilles-tendon-stiffness-and-ground-contact-time-during-drop-jumps
#3
Mohamed Abdelsattar, Andreas Konrad, Markus Tilp
The purpose of this study was to investigate the relationship between Achilles tendon stiffness and ground contact time (GCT) during drop jumps. The property of "springiness" and a short GCT during the movement is required in several types of sports. Therefore, a stiff tendon might be advantageous due to the quick force transmission from the muscle to the bone. Hence, a secondary aim was to relate Achilles tendon stiffness with squat jump (SJ) and counter movement jump (CMJ) performance, respectively...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29769816/the-effect-of-two-different-concurrent-training-programs-on-strength-and-power-gains-in-highly-trained-individuals
#4
Henrik Petré, Pontus Löfving, Niklas Psilander
The effects of concurrent strength and endurance training have been well studied in untrained and moderately-trained individuals. However, studies examining these effects in individuals with a long history of resistance training (RT) are lacking. Additionally, few studies have examined how strength and power are affected when different types of endurance training are added to an RT protocol. The purpose of the present study was to compare the effects of concurrent training incorporating either low-volume, high-intensity interval training (HIIT, 8-24 Tabata intervals at ~150% of VO2max ) or high-volume, medium-intensity continuous endurance training (CT, 40-80 min at 70% of VO2max ), on the strength and power of highly-trained individuals...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29769139/double-bundle-anterior-cruciate-ligament-reconstruction-improves-tibial-rotational-instability-analysis-of-squatting-motion-using-a-2d-3d-registration-technique
#5
Kenichi Kidera, Akihiko Yonekura, Takeshi Miyaji, Yusuke Nakazoe, Kazuyoshi Gamada, Kei Yoneta, Futoshi Ikuta, Masato Tomita, Takashi Miyamoto, Shiro Kajiyama, Akira Hozumi, Ko Chiba, Narihiro Okazaki, Takayuki Shida, Makoto Osaki
BACKGROUND: The anterior cruciate ligament-deficient (ACLD) knee requires appropriate treatment for the patient to return to sports. The purpose of this study was to clarify the kinematics of the anterior cruciate ligament-deficient knee in squatting motion before and after double-bundle anterior cruciate ligament reconstruction (DB-ACLR) using a 2D/3D registration technique. METHODS: The subjects of this study were 10 men with confirmed unilateral ACL rupture who underwent DB-ACLR...
May 16, 2018: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/29768643/effects-of-resistance-training-and-combined-training-program-on-repeated-sprint-ability-in-futsal-players
#6
Julio Torres-Torrelo, David Rodríguez-Rosell, Ricardo Mora-Custodio, Fernando Pareja-Blanco, Juan Manuel Yañez-García, Juan José González-Badillo
The purpose of this study was to compare the effects of 6 weeks resistance training (RT) with combined RT and loaded change of direction (CD) exercise on muscle strength and repeated sprint ability (RSA) in futsal players. Thirty-four players (age: 23.7±4.1 years; height: 1.77±0.06 m; body mass: 74.1±8.2 kg) were randomly assigned into three groups: full squat group (SG, n=12), combined full squat and CD group (S+CDG, n=12), and control group (CG, n=10). The RT for SG consisted of full squat with low-load (~45-60% 1RM) and low-volume (2-3 sets and 4-6 repetitions), whereas the S+CDG performed the same RT program combined with loaded CD (2-5 sets of 10 s)...
May 16, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29758570/acute-hip-abduction-fatigue-on-lumbopelvic-hip-complex-stability-in-softball-players
#7
Jessica Washington, Gabrielle Gilmer, Gretchen Oliver
During an overhead throw, the gluteal muscle group stabilizes the lumbopelvic-hip complex (LPHC), leading to efficient energy transfer from the lower to upper extremity. It has been shown that LPHC instability can lead to throwing pathomechanics. The single leg squat has become a common assessment for LPHC stability, and could be used to determine the effects of fatigue on throwing athletes. The purpose of this study was to determine the effects of an acute abduction fatigue protocol on the LPHC of collegiate softball players via the single leg squat assessment of the leg ipsilateral to the throwing arm...
May 14, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29745784/short-term-effects-of-rolling-massage-on-energy-cost-of-running-and-power-of-the-lower-limbs
#8
Nicola Giovanelli, Filippo Vaccari, Mirco Floreani, Enrico Rejc, Jasmine Copetti, Marco Garra, Lea Biasutti, Stefano Lazzer
PURPOSE: Self-myofascial release (SMFR) is a type of self-massage that is becoming popular among athletes. However, SMFR effects on running performance have not been investigated yet. The aim of the present study was to evaluate the effects of SMFR on cost of running (Cr). In addition, we evaluated the effects of SMFR on lower limbs muscle power. METHODS: The measurement of Cr and lower limb muscle power during squat jump (SJ) and counter movement jump (CMJ) were performed before (PRE), immediately after (POST) and 3hours after (POST 3h) a SMFR protocol (experimental condition)...
May 10, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29742745/validity-and-reliability-of-a-wearable-inertial-sensor-to-measure-velocity-and-power-in-the-back-squat-and-bench-press
#9
Samuel T Orange, James W Metcalfe, Andreas Liefeith, Phil Marshall, Leigh A Madden, Connor R Fewster, Rebecca V Vince
Orange, ST, Metcalfe, JW, Liefeith, A, Marshall, P, Madden, LA, Fewster, CR, and Vince, RV. Validity and reliability of a wearable inertial sensor to measure velocity and power in the back squat and bench press. J Strength Cond Res XX(X): 000-000, 2018-This study examined the validity and reliability of a wearable inertial sensor to measure velocity and power in the free-weight back squat and bench press. Twenty-nine youth rugby league players (18 ± 1 years) completed 2 test-retest sessions for the back squat followed by 2 test-retest sessions for the bench press...
May 8, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29740564/physical-performance-tests-a-relationship-of-risk-factors-for-muscle-injuries-in-elite-level-male-football-players
#10
Kjell Svensson, Marie Alricsson, Marcus Olausson, Suzanne Werner
The purpose of the present study was to investigate whether there is a relationship between the outcome of preseason physical performance tests and the risk of sustaining lower extremity muscle injuries within the same season, in male football players at elite level. This is a cohort study of a male football team (63 players) from the first league in Swe-den. The football players are prospectively followed, in terms of muscle injuries of the lower extremity during five seasons between 2010 and 2014. All muscle injuries were evaluated and diagnosed with ultraso-nography...
April 2018: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/29736344/movement-velocity-in-the-chair-squat-is-associated-with-measures-of-functional-capacity-and-cognition-in-elderly-people-at-low-risk-of-fall
#11
Carlos Balsalobre-Fernández, Ángel Cordón, Nazaret Unquiles, Daniel Muñoz-García
Background: The purpose of this study was to analyze the relationships between muscular performance consisting of a single repetition on the chair squat exercise (CSQ) and different measures of functional capacity, balance, quality of life and cognitive status in older adults. Methods: A total of 40 participants (22 women, 18 men; age = 72.2 ± 4.9 years) joined the investigation. Muscular performance was assessed by measuring movement velocity in the CSQ with no external load using a validated smartphone application ( PowerLift for iOS)...
2018: PeerJ
https://www.readbyqxmd.com/read/29736342/validity-and-reliability-of-the-wimu-inertial-device-for-the-assessment-of-the-vertical-jump
#12
José Pino-Ortega, Javier García-Rubio, Sergio J Ibáñez
The aim of this study was to test the validity and reliability of the inertial device WIMU (Realtrack Systems SL, Almería, Spain) for the assessment of the vertical jump, counter movement jump (CMJ) and squat jump (SJ). Fifteen soccer players were evaluated in two identical sessions separated by one week. In each session, participants performed three jumps of each type. The flight time was quantified by the inertial device WIMU and by a force platform (Twin Plates; Globus Sport and Health Technologies LLC, Codogné, Italy) at the same time...
2018: PeerJ
https://www.readbyqxmd.com/read/29733043/effect-of-whole-body-vibration-on-neuromuscular-performance-a-literature-review
#13
Mohd Mukhtar Alam, Abid Ali Khan, Mohd Farooq
BACKGROUND: Whole-body vibration (WBV) is a neuromuscular training method that has recently received popularity in health and fitness centers, as an additional or substitute method to conventional training and therapy, in order to improve muscle strength and power. OBJECTIVE: The purpose of this review is to critically observe the effect of WBV training on neuromuscular performance in view of its ability to enhance the muscles strength, power, and flexibility; and also to investigate the influence of the different vibration characteristics (viz...
2018: Work: a Journal of Prevention, Assessment, and Rehabilitation
https://www.readbyqxmd.com/read/29733034/influence-of-age-on-lifting-capacity-among-manual-materials-handlers
#14
N Girish, Iqbal Rauf, Khanzode Vivek
BACKGROUND: Recommended weight limit for manual materials handlers has to be decided based on the individual characteristics of the person and age is one of the major variable affecting maximal lifting capacity. But there is limited information on pattern of change in lifting capacity with age. OBJECTIVE: To determine the influence of age on the maximum acceptable weight of lift among manual materials handlers. METHODS: Two hundred and seventeen male construction workers were grouped into four age quotas- 19-28, 29-38, 39-48 and 49-58 years...
May 1, 2018: Work: a Journal of Prevention, Assessment, and Rehabilitation
https://www.readbyqxmd.com/read/29729353/influence-of-foot-position-and-vision-on-dynamic-postural-strategies-during-the-grand-pli%C3%A3-ballet-movement-squatting-in-young-and-adult-ballet-dancers
#15
Anne-Violette Bruyneel, Marc Bertrand, Serge Mesure
PURPOSE: To analyse dynamic postural strategies during the "grand plié" in two different foot positions (parallel or turned out), with and without vision, and as a function of age in ballet dancers. METHOD: Twenty young dancers (YD) aged from 8 to 16 years, and 20 adult dancers (AD) aged from 17 to 30 years were recruited. Center of pressure (CoP) and ground reaction forces (GRF) were recorded (500 Hz) during the grand plié (lowering, squatting and rising)...
May 2, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29727372/the-effect-of-commonly-performed-exercises-on-the-levator-hiatus-area-and-the-length-and-strength-of-pelvic-floor-muscles-in-postpartum-women
#16
Lauren N Siff, Audra J Hill, Samantha J Walters, Ginny Walters, Mark D Walters
OBJECTIVE: The aim oft his study was to compare the effects of 10 common exercises to traditional pelvic floor muscle (PFM) contractions (Kegel) on levator hiatus (LH) area and PFM length and strength. METHODS: This is a cross-sectional study of 15 healthy postpartum women. Ten exercises were studied. These were common variations of leg, core, and back exercises used in yoga, Pilates, strength training, and physical therapy. Each participant performed all 10 exercises at a single visit in 2 examination settings: transperineal ultrasound and perineometry...
May 2, 2018: Female Pelvic Medicine & Reconstructive Surgery
https://www.readbyqxmd.com/read/29722619/whole-body-vibration-training-increases-physical-measures-and-quality-of-life-without-altering-inflammatory-oxidative-biomarkers-in-patients-with-moderate-copd
#17
Camila Danielle Cunha Neves, Ana Cristina Rodrigues Lacerda, Vanessa Kelly Silva Lage, Aline Alves Soares, Maria Gabriela Abreu Chaves, Liliana Pereira Lima, Thyago José Silva, Érica Leandro Marciano Vieira, Antônio Lúcio Teixeira, Hércules Ribeiro Leite, Mariana Aguiar Matos, Vanessa Amaral Mendonça
The whole-body vibration training (WBVT) has been identified as an alternative intervention to improve exercise capacity and quality of life of patients with Chronic Obstructive Pulmonary Disease (COPD). However, the effect of WBVT on inflammatory-oxidative biomarkers remains unknown. The aim of this trial was to investigate the effects of WBVT on quality of life and physical and inflammatory-oxidative parameters in patients with COPD. Twenty patients were equally divided into: 1) intervention group (IG) that performed the WBVT, and 2) control group (CG) that did not receive any intervention...
May 3, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29722584/no-difference-between-the-effects-of-supplementing-with-soy-protein-versus-animal-protein-on-gains-in-muscle-mass-and-strength-in-response-to-resistance-exercise
#18
Mark Messina, Heidi Lynch, Jared M Dickinson, Katharine E Reed
Much attention has been given to determining the influence of total protein intake and protein source on gains in lean body mass (LBM) and strength in response to resistance exercise training (RET). Acute studies indicate that whey protein, likely related to its higher leucine content, stimulates muscle protein synthesis (MPS) to a greater extent than proteins such as soy and casein. Less clear is the extent to which the type of protein supplemented impacts strength and LBM in longer term studies (≥6 weeks)...
May 3, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29721453/tibiofemoral-wear-in-standard-and-non-standard-squat-implication-for-total-knee-arthroplasty
#19
REVIEW
Gusztáv Fekete, Dong Sun, Yaodong Gu, Patric Daniel Neis, Ney Francisco Ferreira, Bernardo Innocenti, Béla M Csizmadia
Introduction: Due to the more resilient biomaterials, problems related to wear in total knee replacements (TKRs) have decreased but not disappeared. In the design-related factors, wear is still the second most important mechanical factor that limits the lifetime of TKRs and it is also highly influenced by the local kinematics of the knee. During wear experiments, constant load and slide-roll ratio is frequently applied in tribo-tests beside other important parameters. Nevertheless, numerous studies demonstrated that constant slide-roll ratio is not accurate approach if TKR wear is modelled, while instead of a constant load, a flexion-angle dependent tibiofemoral force should be involved into the wear model to obtain realistic results...
October 2017: Muscles, Ligaments and Tendons Journal
https://www.readbyqxmd.com/read/29713250/effects-of-%C3%AE-alanine-supplementation-during-a-5-week-strength-training-program-a-randomized-controlled-study
#20
José Luis Maté-Muñoz, Juan H Lougedo, Manuel V Garnacho-Castaño, Pablo Veiga-Herreros, María Del Carmen Lozano-Estevan, Pablo García-Fernández, Fernando de Jesús, Jesús Guodemar-Pérez, Alejandro F San Juan, Raúl Domínguez
Background: β-Alanine (BA) is a non-essential amino acid that has been shown to enhance exercise performance. The purpose of this investigation was to determine if BA supplementation improved the adaptive response to five weeks of a resistance training program. Methods: Thirty healthy, strength-trained individuals were randomly assigned to the experimental groups placebo (PLA) or BA. Over 5 weeks of strength training, subjects in BA took 6.4 g/day of BA as 8 × 800 mg doses each at least 1...
2018: Journal of the International Society of Sports Nutrition
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