Examinando por Autor "Romero Franco, Natalia"
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Ítem Anaerobic Speed Reserve, Sprint Force–Velocity Profile, Kinematic Characteristics, and Jump Ability among Elite Male Speed- and Endurance-Adapted Milers(MDPI, 2022-01-27) Jiménez Reyes, Pedro; Cuadrdo Peñafiel, Victor; Párraga Montilla, Juan A.; Romero Franco, Natalia; Casado, ArturoAbstract: This study aimed to compare sprint, jump performance, and sprint mechanical variables between endurance-adapted milers (EAM, specialized in 1500–3000-m) and speed-adapted milers (SAM, specialized in 800–1500 m) and to examine the relationships between maximal sprint speed (MSS), anaerobic speed reserve (ASR), sprint, jump performance, and sprint mechanical characteristics of elite middle-distance runners. Fifteen participants (8 EAM; 7 SAM) were evaluated to obtain their maximal aerobic speed, sprint mechanical characteristics (force–velocity profile and kinematic variables), jump, and sprint performance. SAM displayed greater MSS, ASR, horizontal jump, sprint performance, and mechanical ability than EAM (p < 0.05). SAM also showed higher stiffness in the 40-m sprint (p = 0.026) and a higher ratio of horizontal-to-resultant force (RF) at 10 m (p = 0.003) and RFpeak (p = 0.024). MSS and ASR correlated with horizontal (r = 0.76) and vertical (r = 0.64) jumps, all sprint split times (r 0.85), stiffness (r = 0.86), and mechanical characteristics (r 0.56) during the 100-m sprint, and physical qualities during acceleration (r 0.66) and sprint mechanical effectiveness from the force–velocity profile (r 0.69). Season-best times in the 800 m were significantly correlated with MSS (r = 0.86). Sprint ability has a crucial relevance in middle-distance runners’ performance, especially for SAM.Ítem The body balance variability of judo athletes during a contest(Editorial Boards of scientific journals,, 2021-07-13) Serrano Huete, Victor; Latorre Román, Pedro A.; García Pinillos, Felipe; Romero Franco, Natalia; Morcillo Losa, José A.; Párraga Montilla, Juan ABackground and Study Aim: One important aspect to know with accuracy and with influence in a judo contest is the balance response that it has on athletes. The purpose was to know the variability in body balance during the successive bouts of a judo contest and possible loss percentages in this ability. Material and Methods: Twenty-two men performed five 5-minute bouts with 15 minutes of passive rest. Immediately after each bout, in rest time, balance abilities indicators were tested in a Sway test: centre or pressures (COP), ellipse of area (EA), Sway long (SL) and mean velocity (MV) in dominant (D), non-dominant (ND) and both legs (B). To compare baseline test data and successive bouts, ANOVA was used. Results: ANOVA revealed significant differences in EAD (ellipse of area dominant leg) p = 0.05, SLND (Sway long no dominant leg) p<0.001, SL2 (Sway long both legs) p = 0.009, MVND (mean velocity no dominant leg) p = 0.01 and MVD (mean velocity dominant leg) p = 0.003. In percentages, some decreases of 51.24% in EAD, 44.92% in SLND, 24.48% in SLB, 62.10% in MVND, 27.18% in MVD and 48.86% in MV2 (mean velocity both legs) were found. Fifteen minutes of rest-time was not enough for recovery the baseline levels in body balance abilities. Conclusions: The balance ability is modified during a judo contest. There is an important loss that affects to assessment of dominant, no dominant and mean values to both legs. Due to the fact that there are a high variability of situations that occurs in judo and individuals adaptations postural to aim a high performance, there is not a proportional loss in balance that in others capacities.