Relación entre la frecuencia cardiaca y el rendimiento en precisión del lanzamiento en waterpolo

Relación entre  frecuencia cardiaca  y rendimiento en la precisión del lanzamiento en Waterpolo”. Propósito: evaluar si la precisión del lanzamiento desde 4 metros a diferentes intensidades de frecuencia cardiaca (180, 150 y 120 p/m) se ve alterada, y qué magnitud tiene esta pérdida de efectividad en el lanzamiento a puerta. Metodología:  Se trabajó con 12 jugadores de campo de Water-polo pertenecientes a la selección nacional de Costa Rica, con una experiencia de juego internacional de más de 4 años. Como instrumento de medición se utilizó un test de precisión para el lanzamiento a portería. Cada jugador tuvo 5 intentos en cada intensidad de frecuencia cardiaca y se contabilizó el porcentaje de aciertos. Este procedimiento se  repitió  en tres días distintos. Se realizó un ANOVA de una vía de medidas repetidas y análisis Post Hoc de Tukey, para determinar si las diferencias fueron estadísticamente  significativas. Resultados: El análisis estadístico indicó una diferencia estadísticamente significativa entre los tres niveles de lanzamiento que se utilizaron. Hubo un aumento continuo en la precisión conforme la frecuencia cardiaca disminuyó. Discusión: Al pasar de 120p/m a 150p/m  la precisión disminuyó un 20,53%, mientras que cuando se pasó de 150p/m a 180p/m  hubo un descenso del 33,94 %. Estos resultados hacen ver la importancia de realizar entrenamientos donde el apartado de lanzamientos con precisión a portería  se realice a altas pulsaciones  y siempre cercano a la franja real de juego

Relació entre la freqüència cardíaca i el rendiment en la precisió del llançament en waterpolo

Propòsit: avaluar si la precisió del llançament des de 4 metres a diferents intensitats de freqüència cardíaca (180, 150 i 120 p/m) es veu alterada, i quina magnitud té aquesta pèrdua d’efectivitat en el llançament a porta. Metodologia: Es va treballar amb 12 jugadors de camp de waterpolo perta­nyents a la selecció nacional de Costa Rica, amb una experiència de joc internacional de més de 4 anys. Com a instrument de mesura es va utilitzar un test de precisió per al llançament a porteria. Cada jugador va disposar de 5 intents en cada intensitat de freqüència cardíaca i es va comptabilitzar el percentatge d’encerts. Aquest procediment es va repetir en tres dies distints. Es va realitzar una ANOVA d’una via de mesures repetides i anàlisi Post Hoc de Tukey, per determinar si les diferències van ser estadísticament significatives. Resultats: L’anàlisi estadística va indicar una diferència estadísticament significativa entre els tres nivells de llançament que es van utilitzar. Va haver-hi un augment continuat en la precisió a mesura que la freqüència cardíaca va disminuir. Discussió: En passar de 120 p/m a 150 p/m la precisió va disminuir un 20,53 %, mentre que quan es va passar de 150 p/m a 180 p/m es va produir un descens del 33,94 %. Aquests resultats palesen la importància de realitzar entrenaments en els quals l’apartat de llançaments amb precisió a porteria es realitzi a pulsacions altes i sempre properes a la franja real de joc

Effects of Plyometric, Strength and Change of Direction Training on High-School Basketball Player's Physical Fitness

The study aim was to compare the effects of a 7-week plyometric, strength and change of direction (COD) training program on basketball-specific performance measures in high-school players. Forty male players were randomly assigned to one of the four groups: plyometric (PG, n = 10), strength (SG, n = 10), COD (CODG, n = 10), and control group training (CG, n = 10). Two training sessions were performed at weekly intervals before basketball training. Performance of the counter movement jump (CMJ), Abalakov jump (ABKJ), 10 m zig-zag sprint, 20 m in line sprint (measurements at 10 and 20 m), and sit and reach flexibility test (SRFT) was assessed before and after the intervention. A 4 (group) x 2 (time) repeated measures analysis of variances (ANOVA) was conducted for each variable. Bonferroni post-hoc tests were used when the interaction was significant. Significant (all p < 0.05) time x group interaction was noted for SRFT, CMJ, ABK, sprint, and zig-zag 10 m, in favor of the experimental groups compared to the control group. However, improvements in physical fitness were similar between the three experimental groups. In conclusion, 7 weeks of specific plyometric, strength and COD training produced similar medium to large improvements in physical fitness of high-school basketball players

Effects of plyometric jump training on jump and sprint performance in young male soccer players: a systematic review and meta-analysis.

Abstract Background: Even from a young age, modern soccer requires high levels of physical fitness development, particularly jumping and sprinting. Plyometric jump training (PJT), combined with young athletes’ regular soccer sessions, has the potential to improve jumping and sprinting. However, studies exploring the effects of PJT are generally limited by small sample sizes. This problem of underpowered studies may thus be resolved by pooling study results in a meta-analysis. Objective: The objective of this systematic review with meta-analysis (SRMA) was to assess the effects of plyometric jump training (PJT) on jumping and sprinting among young male soccer players. Methods: The SRMA included peer-reviewed articles that incorporated PJT in healthy players (i.e., <23 years of age), a control group, and a measure of jumping or sprinting. Means and standard deviations of outcomes were converted to Hedges’ g effect sizes (ES), using the inverse variance random-effects model. Moderator analyses were conducted for PJT duration, frequency, total number of sessions, participants’ chronological age, and FIFA age categories (i.e., U-17 vs. U-20 vs. U-23). A multivariate random effects meta-regression was also conducted. Results: Thirty-three studies were included, comprising 1,499 participants. PJT improved vertical jump tests (ES = 0.60-0.98; all p 7 weeks and >14 PJT sessions induced greater effects compared to PJT with ≤7 weeks and ≤14 total sessions on 10-m sprint performance (between-group p = 0.038). Conclusion. Therefore, PJT is effective in improving jumping and sprinting performance among young male soccer players. Greater 10-m linear sprinting improvements were noted after interventions >7 weeks duration and >14 sessions, suggesting a greater return from exposure to longer PJT interventions, partially in support for the adoption of a long-term approach to athletic development in young athletes. However, with reference to the findings of the meta-regression, and those from the remaining subgroup and single factors analysis, a robust confirmation regarding the moderator role of participant’s age, or PJT configuration effects on young soccer player’s fitness qualities needs future confirmation

Effects of Maturation on Physical Fitness Adaptations to Plyometric Drop Jump Training in Male Youth Soccer Players

The objective of this study was to compare the effects of maturation on physical fitness adaptations to a twice weekly, 7-week plyometric drop jump training program. Seventy-six young male soccer players (aged 10–16 years) participated in this randomized controlled trial. Before and after the intervention, a physical fitness test battery was applied (countermovement jump; drop jump from 20 to 40 cm; 5 multiple bounds test; 20-m sprint time; change of direction speed; 2.4-km running time-trial; 5 repetition maximum [RM] squat; and maximal kicking distance). Participants were randomly divided into an active soccer-control group (CG) with Tanner stage maturation of 1–3 (CG-early; n = 16) or Tanner stage 4–5 (CG-late; n = 22), and to plyometric drop jump training groups with Tanner stage 1–3 (plyometric jump training [PJT]-early; n = 16) or 4–5 (PJT-late; n = 22). The analysis of variance and effect size (ES) measures revealed that when compared with their age-matched controls, the PJT-early (ES = 0.39–1.58) and PJT-late (ES = 0.21–0.65) groups showed greater improvements (p < 0.05) in sprint time, 2.4-km running time-trial, change of direction speed, 5RM squat, jumping, and kicking distance. The PJT-early exceeded the PJT-late group with greater (p < 0.05) improvements in drop jump from 20 cm (ES = 1.58 vs. 0.51) and 40 cm (ES = 0.71 vs. 0.4) and kicking distance (ES = 0.95 vs. 0.65). Therefore, a 7-week plyometric drop jump training program was effective in improving physical fitness traits in both younger and older male youth soccer players, with greater jumping and kicking adaptations in the less-mature athletes

Joint-level energetics differentiate isoinertial from speed-power resistance training—a Bayesian analysis

Background There is convincing evidence for the benefits of resistance training on vertical jump improvements, but little evidence to guide optimal training prescription. The inability to detect small between modality effects may partially reflect the use of ANOVA statistics. This study represents the results of a sub-study from a larger project investigating the effects of two resistance training methods on load carriage running energetics. Bayesian statistics were used to compare the effectiveness of isoinertial resistance against speed-power training to change countermovement jump (CMJ) and squat jump (SJ) height, and joint energetics. Methods Active adults were randomly allocated to either a six-week isoinertial (n = 16; calf raises, leg press, and lunge), or a speed-power training program (n = 14; countermovement jumps, hopping, with hip flexor training to target pre-swing running energetics). Primary outcome variables included jump height and joint power. Bayesian mixed modelling and Functional Data Analysis were used, where significance was determined by a non-zero crossing of the 95% Bayesian Credible Interval (CrI). Results The gain in CMJ height after isoinertial training was 1.95 cm (95% CrI [0.85–3.04] cm) greater than the gain after speed-power training, but the gain in SJ height was similar between groups. In the CMJ, isoinertial training produced a larger increase in power absorption at the hip by a mean 0.018% (equivalent to 35 W) (95% CrI [0.007–0.03]), knee by 0.014% (equivalent to 27 W) (95% CrI [0.006–0.02]) and foot by 0.011% (equivalent to 21 W) (95% CrI [0.005–0.02]) compared to speed-power training. Discussion Short-term isoinertial training improved CMJ height more than speed-power training. The principle adaptive difference between training modalities was at the level of hip, knee and foot power absorption

Healthcare workers hospitalized due to COVID-19 have no higher risk of death than general population. Data from the Spanish SEMI-COVID-19 Registry

Aim To determine whether healthcare workers (HCW) hospitalized in Spain due to COVID-19 have a worse prognosis than non-healthcare workers (NHCW). Methods Observational cohort study based on the SEMI-COVID-19 Registry, a nationwide registry that collects sociodemographic, clinical, laboratory, and treatment data on patients hospitalised with COVID-19 in Spain. Patients aged 20-65 years were selected. A multivariate logistic regression model was performed to identify factors associated with mortality. Results As of 22 May 2020, 4393 patients were included, of whom 419 (9.5%) were HCW. Median (interquartile range) age of HCW was 52 (15) years and 62.4% were women. Prevalence of comorbidities and severe radiological findings upon admission were less frequent in HCW. There were no difference in need of respiratory support and admission to intensive care unit, but occurrence of sepsis and in-hospital mortality was lower in HCW (1.7% vs. 3.9%; p = 0.024 and 0.7% vs. 4.8%; p<0.001 respectively). Age, male sex and comorbidity, were independently associated with higher in-hospital mortality and healthcare working with lower mortality (OR 0.211, 95%CI 0.067-0.667, p = 0.008). 30-days survival was higher in HCW (0.968 vs. 0.851 p<0.001). Conclusions Hospitalized COVID-19 HCW had fewer comorbidities and a better prognosis than NHCW. Our results suggest that professional exposure to COVID-19 in HCW does not carry more clinical severity nor mortality

A922 Sequential measurement of 1 hour creatinine clearance (1-CRCL) in critically ill patients at risk of acute kidney injury (AKI)

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