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isokinetic muscle strength

Dokyung Kim, Geon Park, Liang-Tseng Kuo, Wonhah Park
BACKGROUND: Patients with knee osteoarthritis (OA) were reported to have quadriceps weakness, and impaired proprioception, both related to pain and swelling. It is unclear whether pain alone a causal factor to above findings over the knee joint. The purpose of this study was to assess the effects of knee pain alone on the quadriceps strength, proprioception and dynamic balance in subjects with bilateral knee OA without joint swelling. METHODS: Fourty females with mean age of 68...
October 17, 2018: BMC Geriatrics
Özge Çınar-Medeni, Gulcan Harput, Gul Baltaci
The purposes of this study were to analyse (a) if "angle-specific" (AS) flexor and extensor torques were different between ACL-reconstructed and uninvolved limbs, (b) the difference in peak torque occurrence angles for concentric and eccentric knee flexor and extensor torques between involved and uninvolved limbs and (c) if AS concentric and eccentric knee flexor and extensor torques are determinants of performance in the "single-leg hop test" (SLHT) and "vertical jump and reach test" (VJRT) in ACL-reconstructed legs...
October 13, 2018: Journal of Sports Sciences
Yuta Takanashi, Yu Chinen, Shigeo Hatakeyama
BACKGROUND: Physical strength improvements have been observed with whole-body vibration training (WBVT); however, the appropriate load and duration have not been determined. Furthermore, studies on WBVT in throwing athletes, for whom power training is important, are lacking. Therefore, we examined the effectiveness of lower limb training by WBVT in male throwing athletes. METHODS: Fourteen male throwing athletes were enrolled. Lower limbs training (squat, single-leg squat, forward lunge, and side lunge) was performed with WBVT (n=7) or without WBVT (n=7)...
October 10, 2018: Journal of Sports Medicine and Physical Fitness
Michael O Harris-Love, Nilo A Avila, Bernadette Adams, June Zhou, Bryant Seamon, Catheeja Ismail, Syed H Zaidi, Courtney A Kassner, Frank Liu, Marc R Blackman
Estimates of muscle tissue composition may have greater prognostic value than lean body mass levels regarding health-related outcomes. Ultrasound provides a relatively low cost, safe, and accessible mode of imaging to assess muscle morphology. The purpose of this study was to determine the construct validity of muscle echogenicity as a surrogate measure of muscle quality in a sample of older, predominantly African American (AA) participants. We examined the association of rectus femoris echogenicity with mid-thigh computed tomography (CT) scan estimates of intra- and intermuscular adipose tissue (IMAT), basic metabolic parameters via blood sample analysis, muscle strength, and mobility status...
October 10, 2018: Journal of Clinical Medicine
Wei-Hsiu Hsu, Chun-Hao Fan, Pei-An Yu, Chi-Lung Chen, Liang-Tseng Kuo, Robert Wen-Wei Hsu
BACKGROUND: Increased body mass index (BMI) has been associated with poorer function in patients who have undergone anterior cruciate ligament (ACL) reconstruction. However, the effect of high BMI on muscle strength in these patients remained unclear. The current study aimed to compare knee muscle strength and Knee injury and Osteoarthritis Outcome Score (KOOS) in ACL-reconstructed patients with a variety of different BMIs. METHODS: From November 2013 to March 2016, we prospectively enrolled 30 patients who underwent ACL reconstruction (18-60 years of age)...
October 10, 2018: BMC Musculoskeletal Disorders
Liang Cheng, Shuwan Chang, Li Qian, Yayi Wang, Ming Yang
BACKGROUND: The aim of this study was to explore the efficacy of 16 weeks of extracorporeal shockwave therapy in athletes with patellar tendinopathy. METHODS: Athletes with patellar tendinopathy were matched for age, height and body weight and assigned to the experimental group (n=26) or control group (n=25). Subjects in the experimental group received 16 rounds (once per week) of extracorporeal shockwave therapy (2,000 single shocks; strength, 1.5 to 3.0 bar; shock frequency, 9 to 12 Hz)...
October 1, 2018: Journal of Sports Medicine and Physical Fitness
Grant E Norte, Jay N Hertel, Susan Saliba, David R Diduch, Joseph M Hart
CONTEXT:  Relationships between quadriceps function and patient-reported outcomes after anterior cruciate ligament reconstruction (ACLR) are variable and may be confounded by including patients at widely different time points after surgery. Understanding these relationships during the clinically relevant phases of recovery may improve our knowledge of specific factors that influence clinical outcomes. OBJECTIVE:  To identify the relationships between quadriceps function and patient-reported outcomes in patients <2 years (early) and >2 years (late) after ACLR, including those with posttraumatic knee osteoarthritis...
October 5, 2018: Journal of Athletic Training
Zuzana Gonosova, Petr Stastny, Jan Belka, Lucia Bizovska, Michal Lehnert
Monitoring seasonal variations in strength performance and the relative risk of injury indicators related to strength of hamstring (H) and quadriceps (Q) in female elite athletes is beneficial for the training process. The aim of this study was to examine and compare the level of muscle strength, the conventional ratio (HCONC/QCONC) as well as two functional and strength ratios reflecting the movement of knee extension (HECC/QCONC) and flexion (HCONC/QECC), and the bilateral percentage strength deficit (BSD) in elite female handball players...
August 31, 2018: Journal of Human Kinetics
Christian Tapking, Andrew M Armenta, Daniel Popp, David N Herndon, Ludwik K Branski, Jong O Lee, Oscar E Suman
OBJECTIVE: Severe burns cause hypermetabolic responses and prolonged hospitalization, resulting in loss of body mass and muscle strength. This study aimed to determine whether long-term gains in lean body mass (LBM) after structured exercise programs are functionally meaningful and related to greater muscle strength in severely burned children. STUDY DESIGN: LBM and muscle strength were measured at discharge and at 6, 12, 24, and 36 months after burn in 349 children...
September 29, 2018: Burns: Journal of the International Society for Burn Injuries
Robert P Runner, Stephanie A Boden, William S Godfrey, Ajay Premkumar, Heather Samady, Michael B Gottschalk, John W Xerogeanes
Background: Peripheral nerve blocks, particularly femoral nerve blocks (FNBs), are commonly performed for anterior cruciate ligament (ACL) reconstruction. However, associated quadriceps muscle weakness after FNBs is well described and may occur for up to 6 months postoperatively. The adductor canal block (ACB) has emerged as a viable alternative to the FNB, theoretically causing less quadriceps weakness during the immediate postoperative period, as it bypasses the majority of the motor fibers of the femoral nerve that branch off proximal to the adductor canal...
September 2018: Orthopaedic Journal of Sports Medicine
Ahlan Benezar Lima, Ewertton de Souza Bezerra, Lucas Bet da Rosa Orssatto, Ericles de Paiva Vieira, Luhan Ammy Andrade Picanço, João Otacilio Libardoni Dos Santos
Functional resistance training can increase strength, knee torque ratio, and functional performance in elderly women. The aim of the present study was to understand the effects of closed kinetic chain exercises with constant load on muscular strength, the knee torque conventional ratio (hamstring:quadriceps - H:Q), and functional capacity in the elderly. Nine untrained healthy elderly women participated in experimental resistance training. Ten-repetition maximum (10RM) for the deadlift, isokinetic maximum voluntary concentric contraction, and functional capacity were assessed before and after the 7-week resistance-training program...
August 2018: Journal of Exercise Rehabilitation
Alexandre R M Pelegrinelli, Leandro C Guenka, Josilainne M Dias, Lais F Dela Bela, Mariana F Silva, Felipe A Moura, Lee E Brown, Jefferson R Cardoso
Background: and Purpose: Knee muscle strength deficits have been reported in individuals who have undergone anterior cruciate ligament reconstruction (ACLR). Isokinetic testing is a valid way to assess muscle strength. Some isokinetic variables, including the range of motion in the phases to attain a specific velocity, load range (sustained specific velocity), time to achieve deceleration, and qualitative analysis of the torque-angle velocity relationship, may contribute to understanding recovery of these individuals after surgery...
August 2018: International Journal of Sports Physical Therapy
Kenneth G Harlan, Roberto B Merucci, Jalen J Weaver, Thomas C Windle, Moh H Malek
Harlan, KG, Merucci, RB, Weaver, JJ, Windle, TC, and Malek, MH. Pre-exhaustion exercise differentially influences neuromuscular fatigue based on habitual physical activity history. J Strength Cond Res XX(X): 000-000, 2018-Although there is anecdotal evidence of a potential physiological benefit of pre-exhaustion exercise to enhance muscular recruitment, few studies have systematically examined the effect on neuromuscular activity. Moreover, a subject's habitual physical activity history may, in part, contribute to the muscle's response on a subsequent workbout after a single pre-exhaustion workbout...
September 27, 2018: Journal of Strength and Conditioning Research
Alexandra I Goodwin, Brittany E Haws, Ziyad O Knio, Per Kristian Moerk, Anna N Miller
Background: The speed and degree of functional recovery over time after surgery for tibial shaft fracture has been previously described using subjective methods. Questions/Purpose: This study aimed to quantitatively measure recovery of isokinetic strength in the injured leg after surgical repair of isolated closed tibial shaft fracture. Methods: In this prospective case series, patients were recruited after intramedullary nailing for isolated closed tibial shaft fracture at an academic medical center from January 2012 to December 2015...
October 2018: HSS Journal: the Musculoskeletal Journal of Hospital for Special Surgery
Raphael Huber, Claudio Viecelli, Mario Bizzini, Bernd Friesenbichler, Markus Dohm-Acker, Thomas Rosenheck, Laurent Harder, Nicola A Maffiuletti
OBJECTIVE: Hamstring and patellar tendon autografts are the most frequently-used graft types for anterior cruciate ligament (ACL) reconstruction, with no consensus on their respective effects on thigh muscle strength. The objective of this study was to re-examine isokinetic knee extensor and flexor strength before and after ACL reconstruction with patellar and hamstring tendon grafts using a single-center and a relatively large database, where surgical, rehabilitation and testing procedures were strictly standardized for all patients...
September 25, 2018: Physician and Sportsmedicine
Jeam Marcel Geremia, Bruno Manfredini Baroni, Fábio Juner Lanferdini, Rodrigo Rico Bini, Francesca Chaida Sonda, Marco Aurélio Vaz
OBJECTIVES: To document the magnitude and the time course of neuromechanical and morphological adaptations in response to a triceps surae eccentric training program. METHODS: Twenty healthy male subjects completed a control period followed by a 12-week isokinetic eccentric training program. Triceps surae neuromechanical and morphological evaluations were performed every 4 weeks. RESULTS: The training program led to increases in: eccentric (32%), isometric (13%) and concentric (20%) torques; eccentric (32%) and isometric (24%) electromyographic activity; and, muscle thickness (14%)...
September 7, 2018: Physical Therapy in Sport
Krzysztof Buśko, Michał Górski, Pantelis Theodoros Nikolaidis, Joanna Mazur-Różycka, Patrycja Łach, Zbigniew Staniak, Jan Gajewski
PURPOSE: The main goal of the present study was to examine muscle strength and power of dominant and non-dominant leg, knee extensors and flexors, and their correlations with jumping performances in soccer players. A secondary aim was to evaluate muscle sense. METHODS: 31 male professional strikers (age 20.9 ± 2.3 years, body mass 75.1 ± 6.6 kg, body height 179.5 ± 4.7 cm) participated in the study. The power output of lower extremities and the height of rise of the body mass centre during vertical jumps were measured using a force plate...
2018: Acta of Bioengineering and Biomechanics
Jozo Grgic, Craig Pickering
OBJECTIVES: The aims of this paper are threefold: (1) to summarize the research examining the effects of caffeine on isokinetic strength, (2) pool the effects using a meta-analysis, and (3) to explore if there is a muscle group or a velocity specific response to caffeine ingestion. DESIGN: Meta-analysis. METHODS: PubMed/MEDLINE, Scopus, and SPORTDiscus were searched using relevant terms. The PEDro checklist was used for the assessment of study quality...
August 30, 2018: Journal of Science and Medicine in Sport
Jessica F Baird, Elizabeth A Hubbard, Bradley P Sutton, Robert W Motl
Muscle weakness, particularly in the lower-extremities, is common in multiple sclerosis (MS) and seemingly results from damage along white matter pathways in the central nervous system including the corticospinal tract (CST). This study examined CST structural integrity indicated by diffusion tensor imaging (DTI) related metrics (fractional anisotropy [FA], mean diffusivity [MD], radial diffusivity [RD], and axial diffusivity [AD]) as correlates of knee flexor (KF) and knee extensor (KE) muscle strength in MS...
September 10, 2018: Brain Research
Thomas Bjørnsen, Mathias Wernbom, Alexander Kirketeig, Gøran Paulsen, Lars Samnøy, Lasse Bækken, David Cameron-Smith, Sveinung Berntsen, Truls Raastad
PURPOSE: To investigate the effects of blood flow restricted resistance exercise (BFRRE) on myofiber areas (MFA), number of myonuclei and satellite cells (SC), muscle size and strength in powerlifters. METHODSSeventeen national level powerlifters (25±6 yrs [mean±SD], 15 men) were randomly assigned to either a BFRRE group (n=9) performing two blocks (week 1 and 3) of five BFRRE front squat sessions within a 6.5-week training period, or a conventional training group (Con; n=8) performing front squats at ~70% of one-repetition maximum (1RM)...
September 4, 2018: Medicine and Science in Sports and Exercise
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