Global ETD Search
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Showing 1 to 15 of 15 for “"reactive strength index"”.
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The effect of acute fatigue on reactive strength index in modern dancers
… cycle (SSC) performance measured by the Reactive Strength Index (RSI) derived from a drop jump. Methods: Twelve professional modern dancers (8 female, 4 male) participated in this study. Two force plates were utilized to record the force-time data during drop jumps (DJ) before and after …
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Training load quantification in professional Australian basketball and the use of the reactive strength index as a monitoring tool
Study 1: The intraday reliability of the reactive strength index (RSI) calculated from a drop jump in professional men’s basketball. Purpose: To evaluate the reliability of the reactive strength index (RSI) and jump height (JH) performance from multiple drop heights with elite basketball players. …
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Beyond jump height: Understanding the kinematics and kinetics of the countermovement jump from vertical ground reaction force data through the use of higher-order time derivatives
… rate of propulsive force development, modified reactive strength index) which are used to describe jump performance as well as the jumper’s overall neuromuscular function. The accurate calculation of these variables first requires precise identification of critical kinematic and kinetic ‘events’ …
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Evaluating Stretch-Shortening Cycle Function in Athletes After ACL Reconstruction Using a Repeat Hop Test
… ACLR limbs exhibited reduced hop heights and reactive strength index (jump height/ground contact time) during the HIGH condition relative to non-injured contralateral and healthy control limbs, but not during the FAST condition. It was also observed that isometric knee extensor strength, but …
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Injuries and adolescent ballet dancers: current evidence, epidemiology, and intervention
… whereas poor motor performance in power and strength as modifiable risk factors. Methods: A systematic review was conducted to evaluate the association of growth, maturation and overuse injuries in aesthetic sports/disciplines. This was followed by a prospective cross sectional study to …
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Which resistance training method best improves running economy in elite marathon runners: a 16-week randomised controlled study
… concurrent heavy-weight training (HWT) and reactive-strength (RST) to determine which leads to better running performance improvements and to investigate the underlying mechanisms and adaptation time-course. Methodology: This blocked, randomised controlled study tested participants (HWT = 8, …
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Examining the relationship between performance, recovery, and salivary biomarkers in NCAA DI American football athletes
… < 0.001) indicating a lack of supercompensation. Reactive strength index-modified (RSImod) decreased for the first half of the season, but rebounded following a bye week, indicating its regulation based on fatigue. Inflammatory biomarkers (IL-6 and TNF-alpha) decreased significantly from …
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Dynamic Strength Index and Countermovement Jump Performance in Female and Male Collegiate Basketball Athletes Across a Competitive Season
Background: Basketball demands high levels of strength and power for actions such as jumping, sprinting, and changing direction. Monitoring these physical attributes across a competitive season can help inform training strategies. The countermovement jump (CMJ) and isometric mid-thigh pull (IMTP) …
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The effect of vertically- and horizontally-directed plyometric exercise on sprint running performance
… jumps (SJs), and depth jumps (DJs) from 0.20 m (reactive strength index (RSI-20)) and 0.40 m (RSI-40). Muscle fascicle length (FL) and angle pennation (AP) of the GM were assessed using ultrasonography, while dual-energy x-ray absorptiometry (DEXA) was used to determine body fat percentages (BF%) …
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Anthropometry and physical characteristics in English premiership women’s rugby
… were heavier, and demonstrated greater absolute strength. Backs engaged in more high-speed running, were leaner, aerobically fitter, and relatively stronger. In study 2, anthropometry using dual-X-ray absorptiometry and physical characteristics made up of strength and power tests (countermovement …
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Position-specific isometric strength tests and their relationship with dynamic performance in collegiate athletes
… many sports and its correlation with isometric strength tests has garnered substantial attention considering the practical utility of isometric testing. Practitioners have assessed maximal isometric strength in athletic populations predominantly using bilateral isometric pulling tests to reveal …
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The countermovement rebound jump assessment: validity, reliability, associations with athletic performance and sensitivity to change
… was to compare the differences in jump height, reactive strength index modified (RSImod), and reactive strength index (RSI) computed using four different jump height calculation methods. Results revealed that time to take-off (TTTO) in the CMJ was significantly longer than in the first jump of …
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Asymmetries within elite youth soccer players: an investigation into the impact of soccer-specific loading
… adolescent growth spurt (Read et al., 2016). The reactive strength index of the SLDJ also exhibited poor reliability. The IMTP peak force was reliable; however, time-specific forces were less reliable across groups, with reliability varying among maturation groups. In Study 4, a body weight …
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Strength and power assessment in rehabilitation: profiling the athlete’s return to sport journey following ACL reconstruction
… The aim of the proposed research was to examine strength and power in the rehabilitation pathway of soccer players following ACL reconstruction. This enabled us to explore interrelationships between physical capacities, movement strategies, and subsequent injury risk. These data were also …
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Inter-limb asymmetry: longitudinal monitoring and associations with speed and change of direction speed in elite academy soccer players
… time points; however, ground contact time and reactive strength index (RSI) showed significant improvements at the end of the season, compared to both previous time points. When monitoring asymmetry, the group mean value showed no significant differences throughout the season with corresponding …