The purpose of the present study was to elucidate how plyometric training improves stretch–shortening cycle (SSC) exercise performance in terms muscle strength, tendon stiffness, and muscle–tendon behavior during SSC exercise. Eleven men were assigned a group ten control group. Subjects performed depth jumps (DJ) using only ankle joint for 12 weeks. Before after period, we observed reaction forces at foot, gastrocnemius, electromyographic activities triceps surae tibialis anterior DJ....

Hirayama, K. Acute effects of an ascending intensity squat protocol on vertical jump performance. J Strength Cond Res 28(5): 1284–1288, 2014—The purpose this study was to examine the acute consisting single-repetition exercises subsequent Fourteen college weightlifters attended 2 testing sessions: (SQ) and control (CON) conditions. In SQ condition, with incremental loads (20% 1 repetition maximum [RM], 40% 1RM, 60% 80% maximal isometric [MI] half-squat exercise) were performed a time...

The transversus abdominis (TrA), which is considered to be involved in controlling spinal stability, covered by two muscles (i.e. the external and internal oblique muscles) as well subcutaneous fat. Therefore, there were doubts about whether it was possible perform highly reliable measurements of muscle elasticity.To investigate reliability ultrasound elastography for quantification elasticity TrA.A skilled an unskilled operator measured TrA 10 healthy men (age, 24 ± 4 years; height, 172.0...

The purpose of the present study was to examine a hypothesis that musculotendinous behavior during propelling action with countermovement can be altered by single practice session through modulation neuromuscular activities.Eight males performed unilateral maximal plantarflexion (CMJ) and without (noCMJ) before after consisting six sets three repetitions CMJ exercises. Measurements included EMG activities triceps surae tibialis anterior muscles fascicle gastrocnemius ultrasonography, impulse...

This study examined the relationship of muscle size indices pectoralis major with bench press and throw performances in 18 male collegiate athletes. The maximal cross-sectional area (MCSAMAx) volume (MV) were determined by magnetic resonance imaging. First, subjects tested for their one repetition maximum strength (1RMBP) using a Smith machine. At later date, performed throws machine several different loads ranging from 30.0 kg to 90% 1RMBP. Barbell positions measured linear position...

The aim of this study was to investigate whether accommodating elastic bands with barbell back squats (BSQ) increase muscular force during the deceleration subphase. Ten healthy men (mean ± standard deviation: Age: 23 2 years; height: 170.5 3.7 cm; mass: 66.7 5.4 kg; and BSQ one repetition maximum (RM): 105 23.1 1RM/body 1.6 0.3) were recruited for study. subjects performed band-resisted parallel (accommodating each sides barbell) five band conditions in random order. duration subphase, mean...

Knee alignment is suggested to be a factor affecting each quadriceps femoris muscle size, and knee such as Q-angle differs between men women. Also, training can induce inhomogeneous hypertrophy among the femoris, thereby leading different component characteristics of muscles. If major determinant muscularity, it hypothesized that sex-related difference in if any, further highlighted trained individuals, being associated with Q-angle. We tested this hypothesis. Magnetic resonance images right...

Takei, S, Hirayama, K, and Okada, J. Comparison of the power output between hang clean high pull across a wide range loads in weightlifters. J Strength Cond Res 35(2S): S84-S88, 2021-The current study compared peak during (HPC) (HHP) external Eight weightlifters completed 1 repetition maximum (1RM) assessment for HPC (1.59 ± 0.17 kg/body mass) test HHP at relative 40, 60, 70, 80, 90, 95, 100% 1RM HPC. The ground reaction force 2-dimensional bar position data were recorded to determine system...

The optimal load for maximal power output during hang cleans (HPCs) from a mechanical perspective is the 1-repetition-maximum (1RM) load; however, previous research has reported otherwise. present study thus aimed to investigate underlying factors that determine HPCs.Eight competitive Olympic weight lifters performed HPCs at 40%, 60%, 70%, 80%, 90%, 95%, and 100% of their 1RM while ground-reaction force bar/body kinematics were simultaneously recorded. success criterion HPC was set above...

We compared the force–velocity (F–V) characteristics between jump squat (JS) and weightlifting (hang clean [HC] HC pull [HCP]) to determine lower limb F−V portions targeted by exercises. Ten weightlifters performed JS at 0% (body weight only) 70% of their one-repetition maximum (1RM) for back squat, HCP 30‒90% 30‒110% 1RM HC, respectively. Force velocity values each relative load were plotted F–V features JS, HCP. Linear regression was used evaluate participant's results obtain individual...

The aim of this study was to clarify the prevalence and distribution disc degeneration in collegiate rowers investigate relationship between progression low back pain (LBP). In cross-sectional study, 68 were evaluated for lumbar using Pfirrmann classification based on T2-weighted magnetic resonance imaging (MRI). After 2 years, 20 participants underwent follow-up MRI. Injury surveillance check LBP conducted first examination study. symptoms investigated. Thirty-one (45.6%) had degeneration:...

Rate of torque development (RTD) is considered important for improving the performance in sports requiring explosive strength. Although RTD was reported to be increased after explosive-type strength training (Tillin et al . Exp Physiol 2012;97:630–41.), effect subsequent detraining on remains unclear. Therefore, this study aimed investigate and short-term during isometric knee extension. Ten male subjects participated study. They underwent 6 weeks (3 days per week) 3 weeks. The consisted...

The purpose of the present study was to examine influence tendon elasticity, muscle strength and activities on amount mechanical work enhancement associated with a counter movement. Twenty-one athletes performed unilateral maximal jump using only ankle joint (CMJ) without (no-CMJ) movement sledge apparatus. Mechanical done by calculated from ground reaction force kinematic parameters, difference between CMJ no-CMJ conditions (ΔWork) determined. During exercise, electromyographic (EMG) were...

Abstract Purpose This study aimed to investigate the medical care provided at venue of weightlifting event Tokyo 2020 Olympic Games. Methods We retrospectively evaluated athletes who availed services during In total, 194 participated in competition. Injuries and illnesses were classified into cases handled without physician or requiring examination by a physician. These tabulated for each location (athlete station, field play [FOP], first-aid station training floor warm-up area). Results...

BACKGROUND: We aimed to determine the relationship between bench press (BP) and throw (BT), with respect maximum mechanical power output (Pmax) load at Pmax (Pmax load).METHODS: Thirteen male collegiate football players participated in this study. During first testing session, we determined each subject’s one-repetition (1RM) strength using a Smith machine. second ballistic BP BT exercises were performed machine set different loads ranging from 30.0 kg 90% of 1RM. The barbell positions...