Long-Term Changes in Vertical Jump, H:Q Ratio and Interlimb Asymmetries in Young Female Volleyball Athletes.

The present study aimed to examine the changes that occurred in vertical jump and isokinetic dynamometer (ISK) performances at the beginning of a preparatory period (PRE) and at the start of the competitive period (POST). Sixteen U-17 elite female volleyball players, from a national level (15.34 ± 1.

Metabolic and immune/inflammatory alterations induced by a triathlon under extreme conditions.

Purpose: To investigate the effects of triathlon racing under extreme conditions on metabolic and immune/inflammatory responses.

Methods: Thirteen amateur athletes participated in an extreme triathlon competition (swim - 3.8 km; cycling - 180 km; running - 4 2 km; with a 3,700 m accumulated altitude).

Using Physiological Laboratory Tests and Neuromuscular Functions to Predict Extreme Ultratriathlon Performance.

This study aims to investigate the relationship between split disciplines and overall extreme ultra-triathlon (EUT) performance and verify the relationship among physiological and neuromuscular measurements with both fractional and total EUT performance while checking which variables could predict partial and overall EUT race time. Eleven volunteers (37 ± 6 years; 176.9 ± 6.

Psychophysiological Stress Markers During Preseason Among Elite Female Soccer Players.

Botelho, R, Abad, CCC, Spadari, RC, Winckler, C, Garcia, MC, and Guerra, RLF. Psychophysiological stress markers during preseason among elite female soccer players. J Strength Cond Res 36(6): 1648-1654, 2022-This study aimed to investigate changes and correlations between mood states and various physiological stress markers after a 7-week preseason period among elite female soccer players.

What teachers need to know and be able to do: A view from teachers, students, and principals in the Brazilian context.

The aim of this study was to determine the main characteristics of a "good teacher" through the use of questionnaires designed to assess teaching skills and competences, considering the point of view of teachers, principals, and students. In total, 82 teachers, 14 principals, and 625 middle-school students from 5 public schools in São Paulo state participated in this study. Two questionnaires were applied, one designed for teachers and principals and the other for students.

Reference power values for the jump squat exercise in elite athletes: A multicenter study.

The present study aimed to provide reference values for lower-limb muscle power assessed during the incremental jump squat (JS) test in elite athletes (i.e., professional athletes competing at international level).

Effects of Drop Jumps on 1000-m Performance Time and Pacing in Elite Male and Female Endurance Runners.

Purpose: To evaluate the effect of drop jumps (DJs) on performance time and pacing in a field test (ie, 1000 m) commonly used to evaluate endurance runners and to evaluate running and jumping performance in male and female athletes separately.

Methods: Twenty elite endurance runners (male, n = 10, 27.8 [7.

Change of Direction Performance in Elite Players From Different Team Sports.

Loturco, I, Pereira, LA, Reis, VP, Abad, CCC, Freitas, TT, Azevedo, PHSM and Nimphius, S. Change of direction performance in elite players from different team sports. J Strength Cond Res 36(3): 862-866, 2022-The primary aim of this study was to examine the differences in change of direction (COD) deficit between elite futsal, soccer, handball, and rugby players.

Centesimal Age and Relative Age Effect in Elite Futsal Players.

To investigate centesimal age (CA) and relative age effect (RAE) in elite male futsal players their date of birth and court-position were accessed through the official FIFA website. The absolute and relative frequency distributions of player births were quantified by quartiles and semesters. The two-way ANOVA and the Chi-Square analysis were applied to check for possible differences.

Do asymmetry scores influence speed and power performance in elite female soccer players?

This study examined the relationships between vertical jump asymmetries and speed and power performance in elite female soccer athletes. Sixteen professional female soccer players (age: 23.0 ± 3.

Relationship Between Resting Heart Rate Variability and Intermittent Endurance Performance in Novice Soccer Players.

: This study examined the relationships between the Yo-Yo Intermittent Recovery Test level 1 (Yo-Yo IR1) and resting heart rate variability (HRV) and submaximal 5'-5' test derived measures in novice male soccer players. : Forty players (11.54 ± 0.

Short-Term Cardiac Autonomic Recovery after a Repeated Sprint Test in Young Soccer Players.

The aim of this study was to describe the time course (within 2 h post-exercise) of heart rate variability (HRV) recovery following a traditional repeated sprint ability (RSA) test applied to youth soccer players. Twenty-four young soccer players (18.4 ± 0.

Is Tensiomyography-Derived Velocity of Contraction a Sensitive Marker to Detect Acute Performance Changes in Elite Team-Sport Athletes?

Purpose: To examine the variations in the velocity of contraction (Vc) assessed using tensiomyography, vertical jumping ability, and sprinting speed induced by 4 different exercise protocols (ie, strength, sprint, plyometric, and technical training sessions) in 14 male national-team rugby players (age 21.8 [2.6] y, weight 83.

Change-of-direction, speed and jump performance in soccer players: a comparison across different age-categories.

This study examined the age-specific development of vertical jump height, straight and change-of-direction (COD) speed, and COD deficit in one-hundred and eighty-two elite soccer players from different age-categories (U15, U17, U20, and Senior). All participants were players of two distinct clubs and were undertaking different training routines, as planned by their technical staff members. For this purpose, the soccer players performed: (1) squat and countermovement jumps; (2) a maximal 20-m linear sprint speed test, and (3) the Zigzag COD test.

Selective Influences of Maximum Dynamic Strength and Bar-Power Output on Team Sports Performance: A Comprehensive Study of Four Different Disciplines.

This study examined the selective influences of one-repetition maximum (1RM) values [assessed in the half-squat (HS)] and bar-power production [assessed in both HS and jump squat (JS) exercises] on the physical performance of male and female team sport athletes from four different sports. Three-hundred and three elite players (31 Olympians) from four different disciplines (47 male soccer players, 58 female soccer players, 28 male handball players, 58 female handball players, 49 male rugby players, and 63 male futsal players) participated in this study. The physical tests were performed over 2 consecutive days for soccer and rugby players, and in 1 day for the remaining athletes.

Functional Screening Tests: Interrelationships and Ability to Predict Vertical Jump Performance.

There are several methods used in sports science to identify asymmetries in athletes, given their purported relevance to injury prevention and performance optimization. We aimed to verify whether asymmetries provided by isokinetic assessments, jump tests, and tensiomyography (TMG) are associated with each other, and whether their respective functional indices are related to jumping ability. TMG parameters, unilateral and bilateral squat-jump (SJ) and countermovement-jump (CMJ) performances, and peak torque in knee-extension and flexion with angular velocities of 60/s and 300/s for twenty-four soccer players were retained for analyses.

Erratum: Interval and continuous aerobic exercise training similarly increase cardiac function and autonomic modulation in infarcted mice.

[This corrects the article on p. 257 in vol. 13, PMID: 28702435.

10 km running performance predicted by a multiple linear regression model with allometrically adjusted variables.

The aim of this study was to verify the power of VO, peak treadmill running velocity (PTV), and running economy (RE), unadjusted or allometrically adjusted, in predicting 10 km running performance. Eighteen male endurance runners performed: 1) an incremental test to exhaustion to determine VO and PTV; 2) a constant submaximal run at 12 km·h on an outdoor track for RE determination; and 3) a 10 km running race. Unadjusted (VO, PTV and RE) and adjusted variables (VO, PTV and RE) were investigated through independent multiple regression models to predict 10 km running race time.

Mechanical Differences between Barbell and Body Optimum Power Loads in the Jump Squat Exercise.

This study compared the values of bar-peak force (PF) and power (PP), body-peak force (PF) and power (PPBody) and bar-mean propulsive power (MPP) in different jump-squat (JS) conditions: unloaded condition (UC); bar-loaded condition (BLC) and optimum bar-MPP condition (OBC). Twenty-five soccer players performed the JS using a bar with negligible mass (UC), using the Smith-machine bar (BLC) and using the load capable of maximizing the bar-MPP (OBC). The PF was significantly higher in the UC (2847.

Power and Speed Differences Between Brazilian Paralympic Sprinters With Visual Impairment and Their Guides.

This study compared the physical performance of Paralympic sprinters with visual impairments (PSVI) and their guides in jump and sprint tests. Ten PSVI and guides executed squat jumps (SJ), countermovement jumps (CMJ), horizontal quintuple right/left-leg jumps (QR/QL), decuple jumps (DEC), and 50-m-sprint tests. The guides were superior to the PSVI in SJ (35.

Muscle Contraction Velocity: A Suitable Approach to Analyze the Functional Adaptations in Elite Soccer Players.

Tensiomyography (TMG) has been used as a simple and non-invasive tool to assess the mechanical properties of skeletal muscles. The TMG-derived velocity of contraction (Vc), which can be calculated from the ratio between maximal radial displacement and the sum of contraction time and delay time, has been proposed for evaluating athletes. However, its sensitivity to training effects and possible relation with changes in soccer players' neuromuscular performance have not yet been addressed.

Correction: Caffeine Ingestion Increases Estimated Glycolytic Metabolism during Taekwondo Combat Simulation but Does Not Improve Performance or Parasympathetic Reactivation.

[This corrects the article DOI: 10.1371/journal.pone.

Bar velocities capable of optimising the muscle power in strength-power exercises.

This study aimed at testing whether there are mean propulsive velocities (MPVs) capable of maximising the mean propulsive power (MPP) during the execution of bench press (BP), bench throw (BT), half squat (HS) and jump squat (JS). Additionally, we assessed the differences in MPP/MPV between ballistic and traditional exercises. Seventeen male rugby sevens players performed MPP tests in BP, BT, HS and JS and maximum isometric force (MIF) tests in HS and BP.

Cardiac Autonomic and Neuromuscular Responses During a Karate Training Camp Before the 2015 Pan American Games: A Case Study With the Brazilian National Team.

Purpose: To quantify the training loads reported by karate athletes of the Brazilian national team in the week immediately before their participation in the 2015 Pan American Games.

Methods: Eleven elite karate athletes (7 men and 4 women, 24.42 ± 3.