Introducción: El objetivo fue examinar la relación entre las características de la composición corporal y el rendimiento físico general y específico en competidores de TKD de nivel nacional de Chile de ambos sexos. Material y métodos: Diseño observacional con 14 competidores de diferentes categorías de peso corporal y que compiten habitualmente en torneos de nivel regional y nacional edad 19 (3) años; talla 164 (10) cm; peso corporal 62 (10) kg; años de experiencia 7,2 (2,9) años participaron en este estudio. Se evaluaron el peso corporal (kg) (PC), la masa grasa (kg), (MG), el porcentaje de masa grasa (%MG), la masa muscular (kg) (MM) y el índice de masa corporal (kg/m2) (IMC). Variables del RF general incluyeron squat jump (cm) (SJ), countermovement jump (cm) (CMJ), velocidad lineal en 5-m (s) (5-M) y 20-m shuttle run test (min) (20MSR) y de forma específica la prueba de agilidad específica en taekwondo (s) (TSAT) y la prueba de velocidad de frecuencia múltiple de patadas (FSKTMULT), específicamente el índice de disminución de patadas (FSKTMULT  KDI %) y el número máximo de patadas ejecutadas (FSKTMULT MAX). Resultados: Se documentó una relación grande significativa (p < 0,00) entre el %MG, la MG y la MM y la mayoría de las variables de rendimiento físico general analizadas. Relaciones grandes significativas (p < 0,05) se observaron entre %MG, la MG y la MM y la prueba TSAT. Una relación grande significativa se documentó entre la MM y FSKTMULT MAX (p<0,03) y entre la MG y FSKTMULT  KDI % (p<0,04). Correlaciones moderadas a bajas se observaron entre el PC y el IMC en la mayoría de las variables de rendimiento físico analizadas. Conclusiones: Los datos sugieren que un bajo %MG y MG seguido de una adecuada MM están relacionados con el rendimiento físico general específico en competidores chilenos de TKD de nivel nacional de ambos sexos.

El taekwondo (TKD) es caracterizado como un deporte intermitente y de alta-intensidad donde predominan la ejecución de movimientos rápidos y explosivos, con desplazamientos continuos y cambios de dirección (COD). Objetivo. El propósito de este estudio fue examinar la asociación entre la prueba TSAT y la fuerza explosiva y la velocidad lineal en 5-M en competidores de TKD de nivel nacional de ambos sexos. Material y métodos. A través de un diseño correlacional 14 competidores de ambos sexos que compiten habitualmente en torneos de nivel regional y nacional, (edad 19 ± 3 años; talla 164 ± 10 cm; peso corporal 62 ± 10 kg; experiencia 7.2 ± 2.9 años) participaron en este estudio. Como indicadores de fuerza explosiva se evaluó squat jump (SJ) y countermovement jump (CMJ), además de la velocidad lineal en 5-m (5-M) y la prueba de agilidad específica en taekwondo (TSAT) Resultados. Entre los principales hallazgos de este estudio se documentó una relación directa (r = .70) entre 5-M y TSAT; una relación inversa (r = -.63) entre SJ; CMJ (r = -.53) y TSAT respectivamente. Conclusiones. Nuestros datos muestran que la prueba de TSAT se relaciona con la velocidad lineal en 5-m y la fuerza explosiva. Los entrenadores deberían considerar el entrenamiento de estas cualidades, utilizando ejercicios similares para desarrollar la agilidad en competidores de TKD. Abstract. Taekwondo (TKD) is characterized as an intermittent and high-intensity sport in which predominates the execution of fast and explosive movements, with continuous movements and changes of direction (COD). Objective. The purpose of this study was to examine the association between the TSAT test, explosive strength, and 5-M line speed in national level TKD competitors of both sexes. Material and method. Through a correlational design, 14 competitors of both sexes who regularly compete in regional and national tournaments (age 19 ± 3 years; size 164 ± 10 cm; body weight 62 ± 10 kg; experience 7.2 ± 2.9 years), participated in this study. As indicators of explosive strength, squat jump (SJ) and countermovement jump (CMJ) were evaluated, as well as the 5-m linear speed (5-M) and the taekwondo-specific agility test (TSAT). Results. Among the main findings of this study, a direct relationship (r = .70) between 5-M and TSAT and an inverse relationship (r = -.63) between SJ, CMJ (r = -.53), and TSAT were documented, respectively. Conclusions. Our data shows that the TSAT test is related to 5-m linear velocity and explosive force. Coaches should consider training these qualities, using similar exercises to develop agility in TKD competitors.

Palma-Muñoz, I, Ramírez-Campillo, R, Azocar-Gallardo, J, Álvarez, C, Asadi, A, Moran, J, and Chaabene, H. Effects of progressed and nonprogressed volume-based overload plyometric training on components of physical fitness and body composition variables in youth male basketball players. J Strength Cond Res 35(6): 1642–1649, 2021—This study examined the effect of 6 weeks of progressed and nonprogressed volume-based overload plyometric training (PT) on components of physical fitness and body composition measures in young male basketball players, compared with an active control group. Subjects were randomly assigned to a progressed PT (PPT, n = 7; age = 14.6 ± 1.1 years), a non-PPT (NPPT, n = 8, age = 13.8 ± 2.0 years), or a control group (CG, n = 7, age = 14.0 ± 2.0 years). Before and after training, body composition measures (muscle mass and fat mass), countermovement jump with arms (CMJA) and countermovement jump without arms (CMJ), horizontal bilateral (HCMJ) and unilateral jump with right leg (RJ) and left leg (LJ), 20-cm drop jump (DJ20), sprint speed (10 m sprint), and change of direction speed (CODS [i.e., T-test]) were tested. Significant effects of time were observed for muscle and fat mass, all jump measures, and CODS (all p < 0.01; d = 0.37–0.83). Significant training group × time interactions were observed for all jump measures (all p < 0.05; d = 0.24–0.41). Post hoc analyses revealed significant pre-post performance improvements for the PPT (RJ and LJ: ∆18.6%, d = 0.8 and ∆22.7%, d = 0.9, respectively; HCMJ: ∆16.4%, d = 0.8; CMJ: ∆22.4%, d = 0.7; CMJA: ∆23.3%, d = 0.7; and DJ20: ∆39.7%, d = 1.1) and for the NPPT group (LJ: ∆14.1%, d = 0.4; DJ20: ∆32.9%, d = 0.8) with greater changes after PPT compared with NPPT for all jump measures (all p < 0.05; d = 0.21–0.81). The training efficiency was greater (p < 0.05; d = 0.22) after PPT (0.015% per jump) compared with NPPT (0.0053% per-jump). The PPT induced larger performance improvements on measures of physical fitness as compared to NPPT. Therefore, in-season progressive volume-based overload PT in young male basketball players is recommended.

BACKGROUND: Explosive strength and change of direction speed (CODS) are relevant physical abilities in karate. OBJECTIVE: To examine the relationship between the characteristics of explosive strength and the 5-m linear sprint (5M) with CODS performance and ii) to examine the influential characteristics of explosive strength on CODS performance. METHODS: Eighteen cadet and junior karate athletes, eight females and ten males were evaluated. The physical abilities assessments included: squat jump (SJ), countermovement jump (CMJ), 5M and CODS. Also, pre-stretch percentage increase (PSA), eccentric utilization index (EUR) reactive strength index (RSI) were calculated. RESULTS: Superior performance (p< 0.05) was documented in SJ, CMJ and CODS in male vs. female. Also, significant correlations between CODS with SJ and CMJ (r=-0.70 to -0.80; R2=-0.51 to -0.73; p< 0.05, respectively) and correlations (r=-0.14 to -0.22; R2= 0.01 to 0.04; p> 0.05) between CODS with RSI, EUR and PSA. Multiple regression model documented that only SJ significantly influenced CODS performance in male (R2= 60%; p= 0.009) and female (R2= 71%; p= 0.001). CONCLUSION: CODS correlate with SJ and CMJ. In particular, SJ influence CODS independently of gender.