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https://www.readbyqxmd.com/read/28821427/effects-of-different-strength-training-frequencies-on-maximum-strength-body-composition-and-functional-capacity-in-healthy-older-individuals
#1
Mari Turpela, Keijo Häkkinen, Guy Gregory Haff, Simon Walker
There is controversy in the literature regarding the dose-response relationship of strength training in healthy older participants. The present study determined training frequency effects on maximum strength, muscle mass and functional capacity over 6months following an initial 3-month preparatory strength training period. One-hundred and six 64-75year old volunteers were randomly assigned to one of four groups; performing strength training one (EX1), two (EX2), or three (EX3) times per week and a non-training control (CON) group...
August 15, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28818450/development-and-delivery-of-a-physiotherapist-led-exercise-intervention-in-a-randomised-controlled-trial-for-subacromial-impingement-syndrome-the-support-trial
#2
Kay Stevenson, Sue Jackson, Julie Shufflebotham, Edward Roddy, Nadine E Foster
PURPOSE: This paper describes the development, content and delivery of a physiotherapist- led individualised, supervised and progressed exercise programme for use in a factorial randomised controlled trial testing treatments for subacromial impingement syndrome. METHODS: To develop the intervention, a survey of community physiotherapists and national guidelines provided the basis for a consensus workshop through which a protocol was developed for the SUPPORT trial physiotherapist-led exercise programme (SUPPORT: SUbacromial impingement syndrome and Pain: a randomised controlled trial Of exeRcise and injection)...
March 24, 2017: Physiotherapy
https://www.readbyqxmd.com/read/28806627/a-novel-clinical-evaluation-method-using-maximum-angular-velocity-during-knee-extension-to-assess-lower-extremity-muscle-function-of-older-adults
#3
Takeshi Arai, Shuichi Obuchi, Yoshitaka Shiba
The purpose of this study is to examine the utilities of maximum angular velocity (AV) assessment during knee extension (KE) using a gyroscope for clinical evaluation of exercise program for older adults. Two hundred and 4 community-dwelling older adults underwent a 3-month exercise intervention program. Outcome measures included AV during KE and other physical functions (isometric strength (IS), walking abilities, and balance functions). A correlation coefficient was used to evaluate the relationships between AV and other physical functions at baseline...
August 3, 2017: Archives of Gerontology and Geriatrics
https://www.readbyqxmd.com/read/28801518/effects-of-plyometric-and-isometric-training-on-muscle-and-tendon-stiffness-in%C3%A2-vivo
#4
Keitaro Kubo, Tomonobu Ishigaki, Toshihiro Ikebukuro
The purpose of this study was to compare the effects of plyometric and isometric training on tendon properties during ramp and ballistic contractions and muscle stiffness under passive and active conditions. Eleven subjects completed 12 weeks (3 days/week) of a unilateral training program for the plantar flexors. They performed plyometric training on one side (PLY) and isometric training on the other side (ISO). Active muscle stiffness in the medial gastrocnemius muscle was calculated according to changes in estimated muscle force and fascicle length during fast stretching after submaximal isometric contractions...
August 2017: Physiological Reports
https://www.readbyqxmd.com/read/28799491/exercise-programmes-for-osteoarthritis-with-different-localization
#5
Sevdalina Lambova
Therapeutic exercises in osteoarthritis (OA) are therapeutic approach with proven efficacy. On the other hand, the different disease form, the lack of established consensus and system for patient education limit the widespread use of therapeutic exercises in clinical practice. The mechanisms of action of therapeutic exercise in OA include the following components e. g., neuromuscular (improvement of proprioception, muscle strength and joint stability), intra-articular (prevention of cartilage degeneration, antiinflammatory effect, improvement of the quality of the joint fluid), periarticular, general health with reduction of cardiovascular risk and psychological components...
August 10, 2017: Current Rheumatology Reviews
https://www.readbyqxmd.com/read/28796126/physiological-pattern-changes-in-response-to-a-simulated-competition-in-elite-women-artistic-gymnasts
#6
Laurie Isacco, Gaël Ennequin, Johan Cassirame, Nicolas Tordi
The outstanding progress in women's artistic gymnastics in recent decades has led to increased technical and physiological demands. The aim of this study was to investigate i) the physiological demands of elite French gymnasts and ii) the impact of a competitive routine on physiological pattern changes. Fourteen French elite female gymnasts performed anthropometric measurements, physical fitness tests and a simulated four event competition. Heart rate (HR) was continuously recorded throughout the duration of the simulated competition...
August 4, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28767527/bioenergetics-and-atp-synthesis-during-exercise-role-of-group-iii-iv-muscle-afferents
#7
Ryan M Broxterman, Gwenael Layec, Thomas J Hureau, David E Morgan, Amber D Bledsoe, Jacob E Jessop, Markus Amann, Russell S Richardson
PURPOSE: To investigate the role of the group III/IV muscle afferents in the bioenergetics of exercising skeletal muscle beyond constraining the magnitude of metabolic perturbation. METHODS: Eight healthy men, performed intermittent isometric knee-extensor exercise to task failure at ~58% maximal voluntary contraction (MVC) under control conditions (CTRL) and with lumbar intrathecal fentanyl to attenuate group III/IV leg muscle afferents (FENT). Intramuscular concentrations of phosphocreatine (PCr), inorganic phosphate (Pi), diprotonated phosphate (H2PO4¯), adenosine triphosphate (ATP), and pH were determined using phosphorous magnetic resonance spectroscopy (P-MRS)...
July 31, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28759532/wrist-resistance-training-improves-motor-control-and-strength
#8
Edward Chu, You-Sin Kim, Genevieve Hill, Yoon Hyuk Kim, Chang Kook Kim, Jae Kun Shim
The aim of the present study was to investigate the effects of a 6-week direction specific resistance training program on isometric torque control and isokinetic torque strength of the wrist joint. Nineteen subjects were randomly assigned to either the wrist training group (n=9) or the control group (n=10). The training group performed wrist exercises in six directions (flexion, extension, pronation, supination, radial deviation, and ulnar deviation) while the control group did not. Data were collected on the isometric torque control, one-repetition maximum (1-RM) strength, and isokinetic maximum torque (angular velocity of 60°/s wrist movements) before and after six weeks of resistance training and at two-week intervals during training...
July 28, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28753624/muscular-fatigue-in-response-to-different-modalities-of-crossfit-sessions
#9
José Luis Maté-Muñoz, Juan H Lougedo, Manuel Barba, Pablo García-Fernández, Manuel V Garnacho-Castaño, Raúl Domínguez
BACKGROUND: CrossFit is a new strength and conditioning regimen involving short intense daily workouts called workouts of the day (WOD). This study assesses muscular fatigue levels induced by the three modalities of CrossFit WOD; gymnastics (G), metabolic conditioning (M) and weightlifting (W). MATERIAL AND METHODS: 34 healthy subjects undertook three WOD (one per week): a G WOD consisting of completing the highest number of sets of 5 pull-ups, 10 push-ups and 15 air squats in 20 min; an M WOD, in which the maximum number of double skipping rope jumps was executed in 8 sets (20 s), resting (10 s) between sets; and finally, a W WOD in which the maximum number of power cleans was executed in 5 min, lifting a load equivalent to 40% of the individual's 1RM...
2017: PloS One
https://www.readbyqxmd.com/read/28750968/different-weight-bearing-push-up-plus-exercises-with-and-without-isometric-horizontal-abduction-in-subjects-with-scapular-winging-a-randomized-trial
#10
Woo-Jeong Choi, Tae-Lim Yoon, Sil-Ah Choi, Ji-Hyun Lee, Heon-Seock Cynn
The aim of the present study was to determine whether the application of isometric horizontal abduction (IHA) differentially affected two weight-bearing push-up plus exercises by examining activation of the scapulothoracic muscles in subjects with scapular winging. Fifteen male subjects performed standard push-up plus (SPP) and wall push-up plus (WPP), with and without IHA. Two-way analyses of variance using two within-subject factors were used to determine the statistical significance of observed differences in upper trapezius (UT), pectoralis major (PM), and serratus anterior (SA) muscle activities and UT/SA and PM/SA muscle activity ratios...
July 2017: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/28750958/muscle-strength-and-stiffness-in-resistance-exercise-force-transmission-in-tissues
#11
Hans Chaudhry, Bruce Bukiet, Ellen Z Anderson, Jared Burch, Thomas Findley
Physical therapists and osteopaths want to know the quantitative force transmitted in the tissues during resistance exercise and also the relationship between tissue strength and the specific type of resistance exercise of the skeletal muscles. This paper uses the strain energy function for large deformations associated with the active and passive response of transversely isotropic skeletal muscle tissue to evaluate muscle strength and force transmitted in tissues during resistance exercises for the quadriceps muscle at the knee during isometric training exercise at different knee angles in vivo...
July 2017: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/28748371/acute-effects-of-heated-resistance-exercise-in-female-and-male-power-athletes
#12
Julia R Casadio, Adam G Storey, Fabrice Merien, Andrew E Kilding, James D Cotter, Paul B Laursen
PURPOSE: To determine the effects of heated resistance exercise on thermal strain, neuromuscular function and hormonal responses in power athletes. METHODS: Sixteen (n = 8 female; 8 male) highly trained power athletes completed a combined strength and power resistance exercise session in hot (HOT ~30 °C) and temperate (CON ~20 °C) conditions. Human growth hormone (hGH), cortisol and testosterone concentrations in plasma, peak power (counter-movement jump, CMJ) and peak force (isometric mid-thigh pull) were measured before and after each training session; thermoregulatory responses were monitored during training...
July 26, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28738671/inertial-flywheel-resistance-training-and-muscle-oxygen-saturation
#13
Rafael Timón, Jesús G Ponce-González, José L González-Montesinos, Guillermo Olcina, Alejandro Pérez-Pérez, José Castro-Piñero
BACKGROUND: The inertial flywheel device causes an increase in eccentric overload during training. The aim was to study muscle oxygen saturation produced during an inertial flywheel squat training, comparing it with a barbell squat training. METHODS: Twelve male adults performed a barbell squat training (3 x 8 reps, 75-80% 1RM) and a flywheel squat training (3 x 8 reps, all-out). Muscle oxygen saturation (%SmO2), total hemoglobin (tHb), reoxygenation, heart rate (HR), lactate, vertical jumps, maximal voluntary isometric contraction and rated perceived exertion (RPE) were studied...
July 24, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28732494/the-effects-of-therapeutic-hip-exercise-with-abdominal-core-activation-on-recruitment-of-the-hip-muscles
#14
Mandy Ky Chan, Ka Wai Chow, Alfred Ys Lai, Noble Kc Mak, Jason Ch Sze, Sharon Mh Tsang
BACKGROUND: Core stabilization has been utilized for rehabilitation and prevention of lower limb musculoskeletal injuries. Previous studies showed that activation of the abdominal core muscles enhanced the hip muscle activity in hip extension and abduction exercises. However, the lack of the direct measurement and quantification of the activation level of the abdominal core muscles during the execution of the hip exercises affect the level of evidence to substantiate the proposed application of core exercises to promote training and rehabilitation outcome of the hip region...
July 21, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28728077/comparison-of-spinal-stability-following-motor-control-and-general-exercises-in-nonspecific-chronic-low-back-pain-patients
#15
MohammadBagher Shamsi, Javad Sarrafzadeh, Aliashraf Jamshidi, Navid Arjmand, Farshid Ghezelbash
BACKGROUND: Motor control exercise was claimed to improve spinal stability in patients with chronic non-specific back pain, but to investigate the effectiveness of this exercise, other outcome measures have been used rather than spinal stability itself. The aim of our study is to assess motor control exercise effects on spinal stability using a biomechanical model. METHODS: Fifty-one patients were assigned to either motor control or general exercises. Before and after trainings, participants were tested for spinal stability at seven isometric tasks...
July 8, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28725437/towards-evidence-based-strength-training-a-comparison-of-muscle-forces-during-deadlifts-goodmornings-and-split-squats
#16
Florian Schellenberg, William R Taylor, Silvio Lorenzetti
BACKGROUND: To ensure an efficient and targeted adaptation with low injury risk during strength exercises, knowledge of the participant specific internal loading conditions is essential. The goal of this study was to calculate the lower limb muscles forces during the strength exercises deadlifts, goodmornings and splits squats by means of musculoskeletal simulation. METHODS: 11 participants were assessed performing 10 different variations of split squats by varying the step length as well as the maximal frontal tibia angle, and 13 participants were measured performing deadlift and goodmorning exercises...
2017: BMC Sports Science, Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28725197/skeletal-muscle-remodeling-in-response-to-eccentric-vs-concentric-loading-morphological-molecular-and-metabolic-adaptations
#17
REVIEW
Martino V Franchi, Neil D Reeves, Marco V Narici
Skeletal muscle contracts either by shortening or lengthening (concentrically or eccentrically, respectively); however, the two contractions substantially differ from one another in terms of mechanisms of force generation, maximum force production and energy cost. It is generally known that eccentric actions generate greater force than isometric and concentric contractions and at a lower metabolic cost. Hence, by virtue of the greater mechanical loading involved in active lengthening, eccentric resistance training (ECC RT) is assumed to produce greater hypertrophy than concentric resistance training (CON RT)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28721747/faster-v%C3%AC-o2-kinetics-after-priming-exercises-of-different-duration-but-same-fatigue
#18
Felipe Mattioni Maturana, Arthur Peyrard, John Temesi, Guillaume Y Millet, Juan M Murias
This study compared the responses of two priming exercises of similar fatigue on the adjustment of the oxygen uptake time constant (τV̇O2) in cycling. Ten healthy young adults (25 ± 3 yr) performed: three step transitions from a 20-W baseline to the power output (PO) below the gas exchange threshold (MOD, MODPRE); a 3-min bout (P3MIN) at 90% of peak PO (POpeak), followed by MOD (MOD3MIN); and a 6-min bout (P6MIN) at 80% of POpeak, followed by MOD (MOD6MIN). The O2 supply-to-O2 demand ([HHb]/V̇O2) ratio was calculated for MODPRE, MOD3MIN, and MOD6MIN...
July 19, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28721030/regular-physical-exercise-improves-cardiac-autonomic-and-muscle-vasodilatory-responses-to-isometric-exercise-in-healthy-elderly
#19
Adriana de Oliveira Sarmento, Amilton da Cruz Santos, Ivani Credidio Trombetta, Marciano Moacir Dantas, Ana Cristina Oliveira Marques, Leone Severino do Nascimento, Bruno Teixeira Barbosa, Marcelo Rodrigues Dos Santos, Maria do Amparo Andrade, Anna Myrna Jaguaribe-Lima, Maria do Socorro Brasileiro-Santos
The objective of this study was to evaluate cardiac autonomic control and muscle vasodilation response during isometric exercise in sedentary and physically active older adults. Twenty healthy participants, 10 sedentary and 10 physically active older adults, were evaluated and paired by gender, age, and body mass index. Sympathetic and parasympathetic cardiac activity (spectral and symbolic heart rate analysis) and muscle blood flow (venous occlusion plethysmography) were measured for 10 minutes at rest (baseline) and during 3 minutes of isometric handgrip exercise at 30% of the maximum voluntary contraction (sympathetic excitatory maneuver)...
2017: Clinical Interventions in Aging
https://www.readbyqxmd.com/read/28720871/localization-of-damage-in-the-human-leg-muscles-induced-by-downhill-running
#20
Sumiaki Maeo, Yukino Ando, Hiroaki Kanehisa, Yasuo Kawakami
We investigated localization of damage within the knee extensors (KEs) and plantar flexors (PFs) induced by downhill running (DR) by using transverse relaxation time (T2)-weighted magnetic resonance imaging (MRI). Fourteen young adults performed 45-min DR (-15% slope) at their maximal tolerable velocity. At pre- and 24, 48, and 72 h post-exercise, T2-MRI was scanned and T2 values for each muscle composing KEs and PFs at proximal, middle, and distal sites were calculated. Maximal isometric torque and rate of torque development (RTD: 0-30, 0-50, 0-100, 0-200 ms) were also measured...
July 18, 2017: Scientific Reports
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