Aims In the current study we investigated effects of resisted sprint training on sprinting performance and underlying mechanical parameters (force-velocity-power profile) based two different protocols: (i) loads that represented maximum power output (Lopt) a 50% decrease in unresisted velocity (ii) lighter 10% velocity, as drawn from previous research (L10). Methods Soccer [n = 15 male] rugby 21; 9 male 12 female] club-level athletes were individually assessed for horizontal force-velocity...

The ability to rise from a chair is important for independence in everyday life. This study was conducted determine what extent knee extension force (KEF) could explain sit-to-stand (STS) performance standard chair.This descriptive and correlational of patients receiving acute rehabilitation (N=107). Measurements KEF both lower extremities were obtained using manual muscle testing (MMT) hand-held dynamometers (HHDs). HHD measurements normalized based on body weight age- sex-specific...

This study aimed to evaluate whether an individualised sprint-training program was more effective in improving sprint performance elite team-sport players compared a generalised program. Seventeen female handball (23 ± 3 y, 177 7 cm, 73 6 kg) performed two weekly training sessions over eight weeks addition their regular practice. An group (ITG, n = 9) targeted based on horizontal force-velocity profile from the pre-training test. Within ITG, displaying lowest, highest and mid-level slope...

Rakovic, E, Paulsen, G, Helland, C, Haugen, T, and Eriksrud, O. Validity reliability of a motorized sprint resistance device. J Strength Cond Res 36(8): 2335-2338, 2022-An increasing number sprint-related studies have used devices to provide while sprinting. The aim this study was establish within-session criterion validity times obtained from Seventeen elite, female, handball players (22.9 ± 3.0 years; 176.5 6.5 cm; 72.7 5.5 kg; training volume 9.3 0.7 hours per week) performed two 30-m...

Horizontal deceleration is a critical locomotor skill underpinning the many changes of speed and direction performed by athletes in multi-directional sports. Despite its importance there are currently no evidence-based guidelines on how to improve horizontal ability. Therefore, aim this article provide practitioners tasked with preparing for demands sports practical recommendations their athlete’s The proposes concept use Braking Performance Framework help guide selection training methods...

Purpose : To analyze and compare the effects of 4 different resisted sprint training (RST) modalities on youth soccer players’ performance after 8 weeks training. Methods Forty-eight players were first randomly assigned to groups only then completed RST: horizontal sprint, vertical (VRS), combined unresisted sprint. Performance in jumps, change direction (COD) ability assessed 1 week before intervention. Magnitude-based inference analysis was performed for calculating within-group pre–post...

ABSTRACT Purpose Force-velocity (FV) profiling is a tool for classifying athletes as force- or velocity-deficient, allowing tailored training prescriptions. However, classification may vary depending on the measurement method used. This study compared FV profile variables derived from countermovement jumps (CMJs) using four approaches: Flight-time method, Kinetic and two Kinematic methods. Methods Sixteen National-level female handball players completed CMJs with 0, 20, 40, 50, 70 kg of...

The purpose of this study was to establish the relationships between 50 m sprint swimming performance and variables acquired from a load-velocity profile established by semi-tethered butterfly swimming. Twelve male elite swimmers participated in present performed with different loads. mean velocity among all upper-limb cycles obtained (race velocity), maximum load were predicted test. There very large correlation (r=0.885, p<0.01) high intra-class (0.844, p<0.001) race velocity. Significant...

The purpose of this study was to examine whether athletes with highly flexible hamstring muscle-tendon units display different passive and contractile mechanical properties compared controls. Flexibility, passive, active torque-angle were assessed in 21 female elite rhythmic gymnasts 16 age-matched athletes. Passive resistance stretch measured during knee extension the hip fixed at 100° flexion. Concentric isokinetic maximal voluntary flexion torques 60°/s same position. Tests flexibility...

The purposes of this study were to establish test-retest reliability calculating load-velocity profiles in front crawl swimming using five and three different external loads, if outcome results comparable between calculation methods for monitoring performance over time. Fifteen swimmers at either national or international competition level (seven females eight males) participated study. subjects performed 25 m semi-tethered with maximal effort progressive loads (females 1, 2, 3, 4, 5 kg...

The purpose of the present study was to establish relationships between sprint front crawl performance and a swimming load-velocity profile. Fourteen male national-level swimmers performed 50 m semi-tethered with three progressive loads. recorded multi-camera system, which two-dimensional head displacement beginning each arm-stroke motion were quantified. Forward velocity (V 50m ), stroke length (SL) frequency (SF) quantified for cycle, mean value all cycles, excluding first last used...

Non-contact anterior cruciate ligament injuries typically occur during cutting maneuvers and are associated with high peak knee abduction moments (KAM) within early stance. To screen athletes for injury risk or quantify the efficacy of prevention programs, it may be necessary to design tasks that mimic game situations. Thus, this study compared KAMs ranking consistency female handball players in three sport-specific fake-and-cut increasing complexity. The biomechanics ( n = 51, mean ± SD:...

The aim of this study was to determine validity velocity measurements a motorized resistance device (MRD) during change direction (CoD). Eight male (age: 22.1 ± 4.2 yrs; weight: 83.3 17.1 kg; height: 181.6 12.6 cm) and three female participants 21.7 1.5 mass: 69.7 2.4 167.0 3.6 completed the modified 505 CoD test (m505) with turning off left right foot while exposed external loads (3, 6, 9 kg) provided by MRD. Three-dimensional kinematic data were measured (200 Hz) for all tests using...

<h3>Background</h3> Anterior cruciate ligament injury (ACL) prevention programs lack game specificity, and the effect on knee loading movement technique during sport-specific cutting tasks has rarely been investigated. <h3>Objective</h3> To determine of a handball-specific ACL program in reducing joint optimizing techniques. <h3>Design</h3> Pre-posttest control group design. <h3>Setting</h3> Biomechanical laboratory. <h3>Participant</h3> 40 young female elite handball players were assigned...

Tests of dynamic postural control eliciting full-body three-dimensional joint movements in a systematic manner are scarce. The well-established star excursion balance test (SEBT) elicits primarily lower extremity with minimal trunk and no upper movements. In response to these shortcomings we created the hand reach (HSEBT) based on SEBT directions. aims current study were 1) compare HSEBT measurements, 2) elicited by both normative range motion values published literature. Ten reaches for...

Measuring dynamic postural control and mobility using task-based full-body movements has been advocated. The star excursion balance test (SEBT) is well-established, but it does not elicit large upper body joint movements. Therefore, the hand reach (HSEBT) was developed. purpose of current study to assess inter-rater test-retest reliability validity HSEBT. Twenty-nine healthy male subjects performed ten HSEBT reaches on each leg four different occasions, led by three raters. Reach distances...

The influence of anthropometric measurements, age, sex and activity level have been found to tests dynamic postural control such as the star excursion balance test (SEBT). hand reach (HSEBT) measures different aspects control. purpose present study was explore these factors on HSEBT. A convenience sample 223 subjects performed four horizontal (L45, R45, L135 R135) two rotational (LROT RROT) reaches. measurements (height, arm length, leg length wingspan) were assessed using stepwise linear...

To assess muscle strength characteristics in patients with resection and megaprosthetic reconstruction of the knee for bone sarcoma compared to age- sex-matched controls.This was a cross-sectional, case-control study. Muscle extension -flexion were assessed isokinetically at three different joint velocities: 60, 120 180°/s, by rate force development (RDFmax) extension. The Toronto Extremity Salvage Score (TESS) used patients.Eighteen (91.6 months postop.) 18 controls included. Relative...

This study was conducted to determine if any one strength measure or combination of measures provided an explanation ambulatory independence among 107 acute rehabilitation patients. a retrospective, descriptive, and correlational where function quantified using the Functional Independence Measure (FIM). Lower extremity by sit stand performance, knee extension force measured manual muscle testing hand held dynamometry. Descriptive, correlational, multiple regression statistical analysis were...

To present a case of right-handed professional tennis player with left internal abdominal oblique muscle tear sustained while serving. We document the progress rehabilitation program consisting primarily kinetic chain isokinetic strength training where symmetrical measurements (<10% side difference) force and dynamic postural control were used as criteria for return to sport.Isokinetic exercises (bilateral rotational pull, unilateral vertical press anterior push) target trunk specific...

The ability to attain standing without assistance is important independent functioning. objectives of this study, therefore, were to: (1) determine the effectiveness Easy-Up Handle for enabling otherwise dependent patients from an armless chair and (2) establish whether knee extension force played a role in such effectiveness.Cross-sectional descriptive study explicatory experiment.Acute rehabilitation unit.A subset (n = 26) 107 primarily elderly described previous study. subjects selected...