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Joint angle strength

Gregory C Bogdanis, Athanasios Tsoukos, Spyridon K Methenitis, Elisavet Selima, Panagiotis Veligekas, Gerasimos Terzis
This study compared knee angle-specific neuromuscular adaptations after two low-volume isometric leg press complex training programmes performed at different muscle lengths. Fifteen young males were divided into two groups and trained three times per week for 6 weeks. One group (n = 8) performed 5-7 sets of 3 s maximum isometric leg press exercise, with 4 min recovery, with knee angle at 85° ± 2° (longer muscle-tendon unit length; L-MTU). The other group (n = 7) performed the same isometric training at a knee angle of 145° ± 2° (180°  = full extension; shorter muscle-tendon unit length; S-MTU)...
August 17, 2018: European Journal of Sport Science
Norikazu Hirose, Masaaki Tsuruike
Hirose, N and Tsuruike, M. Differences in the electromyographic activity of the hamstring, gluteus maximus, and erector spinae muscles in a variety of kinetic changes. J Strength Cond Res XX(X): 000-000, 2018-This study aimed to clarify the differences in the electromyographic (EMG) activity of the semitendinosus (ST), semimembranosus (SM), biceps femoris long head (BFl), gluteus maximus (GM), and erector spinae (ES) muscles during leg curl and bridge exercises across different knee angles and isometric contraction outputs...
August 10, 2018: Journal of Strength and Conditioning Research
Gongju Liu, Gusztáv Fekete, Hongchun Yang, Jing Ma, Dong Sun, Qichang Mei, Yaodong Gu
Objective: The purpose of this study was to determine the differences in technical characteristics between top-elite and sub-elite male weightlifters performing the snatch style in the 69-kg category. The obtained results can provide valuable information for lower level lifters and coaches to achieve better competition performance by altering their training methods accordingly. Methods: Six top-elite and six sub-elite weightlifters participated in this study. The heaviest successful snatch lift from the three attempts of each subject was analyzed...
July 2018: Heliyon
Arnaud Diffo Kaze, Stefan Maas, Slawomir Kedziora, James Belsey, Alexander Haupert, Claude Wolf, Alexander Hoffmann, Dietrich Pape
BACKGROUND: Many different fixation devices are used to maintain the correction angle after medial open wedge high tibial osteotomy (MOWHTO). Each device must provide at least sufficient mechanical stability to avoid loss of correction and unwanted fracture of the contralateral cortex until the bone heals. In the present study, the mechanical stability of following different implants was compared: the TomoFix small stature (sm), the TomoFix standard (std), the Contour Lock, the iBalance and the second generation PEEKPower...
August 8, 2018: Journal of Experimental Orthopaedics
Chiara Zoppirolli, Lorenzo Bortolan, Federico Stella, Gennaro Boccia, Hans-Christer Holmberg, Federico Schena, Barbara Pellegrini
Introduction: Although short-term (approximately 10-min) fatiguing DP has been reported not to alter the joint kinematics or displacement of the centre of mass (COM) of high-level skiers, we hypothesize that prolonged DP does change these kinematics, since muscular strength is impaired following endurance events lasting longer than 2 h. Methods: During the 58-km Marcialonga race in 2017, the fastest 15 male skiers were videofilmed (100 fps, FHD resolution in the sagittal plane) on two 20-m sections (inclines: 0...
2018: Frontiers in Physiology
Ben Ashworth, Patrick Hogben, Navraj Singh, Laura Tulloch, Daniel D Cohen
Objectives: Lower limb isometric tests are used to assess strength and strength asymmetries and monitor reductions in muscle force that may contribute to loss of performance and increase injury risk. Isometric tests in the upper body may be appropriate to monitor neuromuscular performance of the shoulder joint in sports involving contact and overhead actions. The aim of this study was to determine the reliability of a novel upper body isometric strength test. Methods: Eighteen elite rugby players (age 22...
2018: BMJ Open Sport & Exercise Medicine
Silvio Lorenzetti, Mira Ostermann, Fabian Zeidler, Pia Zimmer, Lina Jentsch, Renate List, William R Taylor, Florian Schellenberg
Background: Squatting is a core exercise for many purposes. The tissue loading during squatting is crucial for positive adaptation and to avoid injury. This study aimed to evaluate the effect of narrow, hip and wide stance widths, foot position angles (0°, 21°, and 42°), strength exercise experience, and barbell load (0 and 50% body weight, experts only) during squatting. Methods: Novice ( N  = 21) and experienced ( N  = 21) squatters performed 9 different variations of squats (3 stance widths, 3 foot placement angles)...
2018: BMC Sports Science, Medicine and Rehabilitation
Priscila Oliveira Silva, Arthur Sá Ferreira, Carla Martins de Araujo Lima, Fernando Silva Guimarães, Agnaldo José Lopes
BACKGROUND: Musculoskeletal involvement and cerebrovascular disease are common in sickle cell anaemia (SCA). These changes are potentially important factors that modify the control of balance in this population. OBJECTIVE: To assess balance control in adults with SCA and investigate the associations among balance, posture and muscle function. METHODS: Twenty neurologically intact (i.e. without previous episodes of overt stroke or transient ischaemic attack) adults with SCA and 18 controls were evaluated...
July 16, 2018: Somatosensory & Motor Research
Shuya Chen, Wen-Dien Chang, Jhih-Yun Wu, Yi-Chin Fong
Hip muscle strengthening and knee extensor strengthening are common training exercises for patellofemoral pain syndrome (PFPS). PFPS engendered by insufficient hip abductor and external rotator muscle strength has been of interest, but these exercise movements may increase the lateral vector force of the patella warrants clarification. So, the purpose of this study was to assess muscular activations of vastus lateralis (VL), vastus medialis oblique (VMO), and gluteus medius muscles in electromyographic analysis during hip abduction and external rotator movements and open and closed kinetic chain knee extension movements...
July 2018: Medicine (Baltimore)
Qiang Fang, Seedahmed Mahmoud, Xudong Gu, Jianmin Fu
Many post-stroke patients suffer varying degrees of hand function and fine motor skills impairment. Both passive and active hand rehabilitation training are beneficial in improving the strength and dexterity of the hands. However, hand rehabilitation programs should be prescribed based on an accurate assessment of hand function. In this paper, we propose a novel method for hand function assessment which can accurately measure multiple joint angles of a hand simultaneously using a portable infrared based imaging device...
May 17, 2018: IEEE Journal of Biomedical and Health Informatics
Patroklos Androulakis-Korakakis, Paulo Gentil, James P Fisher, James Steele
Androulakis-Korakakis, P, Gentil, P, Fisher, JP, and Steele, J. Comparison of isolated lumbar extension strength in competitive and noncompetitive powerlifters, and recreationally trained men. J Strength Cond Res XX(X): 000-000, 2018-Low-back strength has been shown to significantly impact performance in a plethora of sports. Aside from its effect on sport performance, low-back strength is strongly associated with low-back pain. A sport that heavily involves the lower-back musculature is powerlifting. This study looked to compare isolated lumbar extension (ILEX) strength in competitive and noncompetitive powerlifters, and recreationally trained men...
July 2, 2018: Journal of Strength and Conditioning Research
Samuel Ryan, Thomas Kempton, Emidio Pacecca, Aaron J Coutts
PURPOSE: To examine the measurement properties of an adductor strength assessment system in professional Australian footballers. METHODS: Observational, longitudinal design. Test-retest reliability data were collected from 18 professional Australian footballers from one club on the same day during the 2017 AFL competition. Week-to-week variation data were collected on 45 professional Australian footballers from one club during the same season at 48, 72 and 120 h post-match (rounds 1-23)...
June 28, 2018: International Journal of Sports Physiology and Performance
John R Harry, Julia Freedman Silvernail, John A Mercer, Janet S Dufek
Harry, JR, Silvernail, JF, Mercer, JA, and Dufek, JS. Bilateral comparison of vertical jump landings and step-off landings from equal heights. J Strength Cond Res 32(7): 1937-1947, 2018-The purpose of this investigation was to examine kinetic, kinematic, and temporal parameters during vertical jump landings (VJL) and step-off landings (STL) from equal heights. Five men (25.0 ± 1.6 years; 1.7 ± 0.4 m; 79.7 ± 7.1 kg) and 5 women (20.8 ± 1.6 years; 1.6 ± 0.4 m; 68.5 ± 7.1 kg) performed 15 VJL and 15 STL...
July 2018: Journal of Strength and Conditioning Research
João Torrinha Jorge, Ana Ferrão, Sandra Alves, Ruben Caetano, Frederico Teixeira
Background  The treatment of chronic scapholunate instability is yet a controversial topic. Arthroscopic reduction-association scapholunate technique is a minimally invasive option in which a stable pseudoarthrosis at the scapholunate joint is obtained, allowing some degree of movement while maintaining the normal alignment of the wrist. The purpose of this study was to review the results of arthroscopic reduction-association scapholunate with an absorbable screw. Methods  We retrospectively evaluated patients with dynamic or static, but reducible, chronic scapholunate instability who underwent arthroscopic reduction-association scapholunate between 2012 and 2015...
July 2018: Journal of Wrist Surgery
Muhammed Şeref Yıldırım, Filiz Tuna, Derya Demirbağ Kabayel, Necdet Süt
Background: Decreased hamstring flexibility is associated with many pathological conditions. For this reason, hamstrings are one of the most frequently evaluated muscle groups for flexibility in the lower extremity. Muscle flexibility is evaluated indirectly by measuring adjacent joint range of motion. Passive and active knee extension angle values are used as an indirect indicator of hamstring flexibility. But the results of the active knee extension test are claimed to be influenced by subject’s quadriceps strength...
June 19, 2018: Balkan Medical Journal
Alberto Encarnación-Martínez, Ventura Ferrer-Roca, Juan García-López
Encarnación-Martínez, A, Ferrer-Roca, V, and García-López, J. Influence of sex on current methods of adjusting saddle height in indoor cycling. J Strength Cond Res XX(X): 000-000, 2018-The popularity of indoor cycling has increased in fitness centers, and therefore, proper bike fitting is important to avoid biomechanical-related injuries. However, no previous studies have compared the biomechanical kinematics of various existing protocols of saddle-height adjustment in indoor cycling. Furthermore, it was not clear if these protocols were appropriate for both men and women, as these equations were primarily obtained in male cyclists...
June 14, 2018: Journal of Strength and Conditioning Research
Shan-Qiang Xu, Yu Zhang, Wen-Ju Zhang, Ping Li
OBJECTIVE: To evaluate the short-term result for the treatment of distal radius fracture with manual resetting and fixing with small splint. METHODS: From January 2015 to December 2016, 60 cases of distal radial fractures were treated by manual resetting and small splint fixation including 39 males and 21 females with an average age of (43.50±10.56) years old ranging from 18 to 65 years old. According to AO classification, 38 cases were type A, 19 cases were type B, 3 cases were type C...
May 25, 2018: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
Alan C Cudlip, Clark R Dickerson
Pushing or pulling an object constitutes the majority of manual materials handling tasks. Anthropometric differences between workers alter pushing and pulling strategies at fixed heights, potentially modifying exposures and causing overexertion. Capability normalized to arm posture rather than work height remains unknown, and the purpose of this research was to quantify maximal pushing and pulling strength and upper extremity joint moments using fixed humeral abduction angles and a flexed arm position. Twenty university-aged females completed maximal pushes and pulls at 0°, 30°, 60°, 90°, and 120° of humeral abduction with an elbow to 90°...
July 2018: Applied Ergonomics
M Marieswaran, Ishita Jain, Bhavuk Garg, Vijay Sharma, Dinesh Kalyanasundaram
The anterior cruciate ligament is one of the six ligaments in the human knee joint that provides stability during articulations. It is relatively prone to acute and chronic injuries as compared to other ligaments. Repair and self-healing of an injured anterior cruciate ligament are time-consuming processes. For personnel resuming an active sports life, surgical repair or replacement is essential. Untreated anterior cruciate ligament tear results frequently in osteoarthritis. Therefore, understanding of the biomechanics of injury and properties of the native ligament is crucial...
2018: Applied Bionics and Biomechanics
Jung-Hoon Lee, Hyun-Su Choi
BACKGROUND: Although cross tape has recently been used by clinicians for various musculoskeletal conditions, scientific studies on the direction of cross tape application are lacking. METHODS: The present study aimed to investigate whether the direction of cross tape application affected the outcomes of the modified O-ring test and maximal pinch strength using a pinch gauge and the conformity between these 2 tests when cross tape was applied to the forearm muscles of individuals with no upper extremity pain and no restriction of joint range of motion...
June 2018: Medicine (Baltimore)
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