In the present study we investigated in vivo length changes fascicles and tendon of human gastrocnemius medialis (GM) muscle during walking. The experimental protocol involved real–time ultrasound scanning GM muscle, recording electrical activity measurement knee– ankle–joint rotations, ground reaction forces six men walking at 3 km h–1 on a treadmill. Fascicular lengths were measured from sonographs recorded. Musculotendon complex estimated anatomical joint kinematic data. Tendon obtained...

The purpose of this study was to investigate the influences static stretching on viscoelastic properties human tendon structures in vivo. Seven male subjects performed which ankle passively flexed 35 degrees dorsiflexion and remained stationary for 10 min. Before after stretching, elongation aponeurosis medial gastrocnemius muscle (MG) directly measured by ultrasonography while ramp isometric plantar flexion up maximum voluntary contraction (MVC), followed a relaxation. relationship between...

Purpose: The purpose of this study was to investigate the effects plyometric and weight training protocols on mechanical properties muscle-tendon complex muscle activities performances during jumping. Methods: Ten subjects completed 12 wk (4 d·wk−1) a unilateral program for plantar flexors. They performed one side (PT; hopping drop jump using 40% 1RM) other (WT; 80% 1RM). Tendon stiffness measured ultrasonography isometric flexion. Three kinds heights only ankle joint (squat jump: SJ;...

The purpose of this study was to quantify the elastic properties tendon structures in vivo and investigate influence on jump performance with without countermovement. Elongation aponeurosis vastus lateralis muscle (dL) directly measured by ultrasonography while subjects (n = 31) performed ramp isometric knee extension up voluntary maximum (MVC). relationship between force dL fitted a linear regression above 50% MVC, slope which defined as stiffness structures. Statistical analysis revealed...

The present study examined whether resistance and stretching training programmes altered the viscoelastic properties of human tendon structures in vivo. Eight subjects completed 8 weeks (4 days per week) which consisted unilateral plantar flexion at 70 % one repetition maximum with 10 repetitions set (5 sets day). They performed (RT) on side static (RST; min day, 7 other side. Before after training, elongation medial gastrocnemius muscle was directly measured using ultrasonography, while...

The present study aimed to investigate the effect of isometric training on elasticity human tendon structures. Eight subjects completed 12 wk (4 days/wk) that consisted unilateral knee extension at 70% maximal voluntary contraction (MVC) for 20 s per set sets/day). Before and after training, elongation structures in vastus lateralis muscle was directly measured using ultrasonography while performed ramp up MVC. relationship between estimated force (L) fitted a linear regression, slope which...

The purpose of this study was to examine whether stretching training altered the viscoelastic properties human tendon structures in vivo. Eight men performed for 3 wk. Before and after training, elongation aponeurosis medial gastrocnemius muscle directly measured by ultrasonography while subjects ramp isometric plantar flexion up voluntary maximum, followed a relaxation. relationship between estimated force (Fm) (L) during ascending phase fitted linear regression, slope which defined as...

The present study aimed to investigate the effects of low-load resistance training with vascular occlusion on specific tension and tendon properties by comparing those high-load training. Nine participants completed 12 weeks (3 days/week) a unilateral isotonic program knee extensors. One leg was trained using low load (20% 1 RM) (LLO) other high (80% without (HL). Before after training, maximal isometric extension torque (MVC) muscle volume were measured. Specific vastus lateralis (VL)...

Kubo, K, Ikebukuro, T, Yata, H, Tsunoda, N, and Kanehisa, H. Time course of changes in muscle tendon properties during strength training detraining. J Strength Cond Res 24(2): 322-331, 2010-The purpose this study was to investigate the time mechanical morphological isometric Eight subjects completed 3 months knee extension detraining for another months. At beginning on every 1 month periods, strength, neural activation level, cross-sectional areas (CSA), stiffness were measured. Training...

The purpose of this study was to compare the effects plyometric and isometric training on tendon properties during ramp ballistic contractions muscle stiffness under passive active conditions. Eleven subjects completed 12 weeks (3 days/week) a unilateral program for plantar flexors. They performed one side (PLY) other (ISO). Active in medial gastrocnemius calculated according changes estimated force fascicle length fast stretching after submaximal contractions. Passive also from slow...

1. The present study aimed to investigate the influence of isometric training protocols with long- and short-duration contractions on elasticity human tendon structures in vivo. was assessed through vivo determination elongation (L) tendons aponeuroses using ultrasonography, while subjects performed ramp exercise up maximum voluntary contraction (MVC). 2. Eight young males completed 12 weeks (4 days per week) a unilateral programme knee extensors, which consisted two different combinations...

The aim of this study was to examine the relationship between structural changes in large and small airways asymptomatic asthmatics quantified by high-resolution computed tomography (HRCT) airflow obstruction. bronchial wall thickness at trunk apical bronchus (B1) right upper lobe used for assessment airways. Air trapping, evaluated ratio average CT‐determined values bilateral lower lung segments full expiration that inspiration (E/I ratio), Measurements were obtained with a helical HRCT 24...

Human skeletal muscle probably atrophies as a result of spaceflight, but few studies have examined this issue. Thus, little is known about the influence microgravity upon human muscle, nor it possible to assess validity ground based models spaceflight. This study tested hypothesis that magnitude spaceflight induced atrophy would be function flight duration and greater than bed rest.Three astronauts flew 9, 15, 16 d in space. Volume knee extensor (quadriceps femoris), flexor (hamstrings,...

The present study aimed to investigate the effect of dynamic leg press training on physiological cross‐sectional areas (PCSAs) human lower limb muscles during 20 days 6° head‐down tilt bed rest. Five healthy men comprised resistance group (BR‐Tr) and data from two previous studies were used derive a 10‐man control (BR‐Cont). BR‐Tr performed sessions (morning afternoon session) action including knee extension plantar flexion daily for rest period: (1) three sets 10 repetitions at 90% maximum...

The purpose of this study was to investigate the growth changes in elastic properties human tendon structures. 9 younger boys (age 10.8 ± 0.9 years, YBG), elder (14.8 0.3 EBG), and 14 young adult men (24.7 1.6 ADG) volunteered take part present study. Using a B-mode ultrasonic apparatus, elongation aponeurosis vastus lateralis muscle (VL) noninvasively measured vivo, while subjects performed extension knee joint isometrically with force production levels from zero (relax) maximal voluntary...

To verify the presence of constitutional abnormality implicated in pathogenesis high-altitude pulmonary edema (HAPE), we evaluated hemodynamic responses to hypoxia, hypobaria, and exercise HAPE-susceptible subjects (HAPE-S). HAPE-S were five males with a history HAPE. Five healthy volunteers who had repeated experiences mountain climbing without any altitude-related problems served as controls. showed much greater increase vascular resistance index (PVRI) than control subjects, resulting...

The purpose of this study was to investigate the influences isometric training at different joint angles on muscle size and function human muscle–tendon complex in vivo . Furthermore, we tried gain a better understanding mechanisms involved angle specificity after from aspect neuromuscular adaptation changes properties complex. Nine males completed 12‐week unilateral program (70% maximal voluntary contraction (MVC) × 15 s six sets) knee extensors 50° (shorter length: ST) 100° (longer LT)....