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Gonzalez-Badillo J.J.,Pablo De Olavide University | Pareja-Blanco F.,Pablo De Olavide University | Rodriguez-Rosell D.,Pablo De Olavide University | Abad-Herencia J.L.,Pablo De Olavide University | And 2 more authors.
Journal of Strength and Conditioning Research | Year: 2015

This study aimed to analyze the effect of velocity-based resistance training (RT) with moderate loads and few repetitions per set combined with jumps and sprints on physical performance in young soccer players of different ages. A total of 44 elite youth soccer players belonging to 3 teams participated in this study: an under-16 team (U16, n 17) and an under-18 team (U18, n 16) performed maximal velocity RT program for 26 weeks in addition to typical soccer training, whereas an under-21 team (U21, n 11) did not perform RT. Before and after the training program, all players performed 20-m running sprint (T20), countermovement jump (CMJ), a progressive isoinertial loading test in squat to determine the load that elicited a ∼1 m·s -1 velocity (V1LOAD) and an incremental field test to determine maximal aerobic speed (MAS). U16 showed significantly (p 0.000) greater gains in V1LOAD than U18 and U21 (100/0/0%). Only U16 showed significantly (p 0.01) greater gains than U21 (99/1/0%) in CMJ height. U18 obtained a likely better effect on CMJ performance than U21 (89/10/1%). The beneficial effects on T20 between groups were unclear. U16 showed a likely better effect on MAS than U21 (80/17/3%), whereas the rest of comparisons were unclear. The changes in CMJ correlated with the changes in T20 (r -0.49) and V1LOAD (r 0.40). In conclusion, velocity-based RT with moderate load and few repetitions per set seems to be an adequate method to improve physical performance in young soccer players. © 2015 National Strength and Conditioning Association. Source

Martinez-Ramirez A.,Public University of Navarra | Lecumberri P.,Public University of Navarra | Gomez M.,Public University of Navarra | Izquierdo M.,Research and Sports Medicine Center
Clinical Biomechanics | Year: 2010

Background: Ankle sprains are one of the most common lower extremity injuries. Real time human motion tracking is an accurate, inexpensive and portable system to obtain kinematic and kinetic measurements. The purpose of this study was to discriminate between subjects with chronic ankle instability and subjects with stable ankles through inertial tracking technology and force plates. Methods: Twelve subjects (mean (SD) 23.16 (5.32) years, 174.83 (8.78) cm, 73.58 (17.10) kg) with stable ankles and 13 (mean (SD) 24.69 (5.91) years, 173.31 (9.07) cm, 69.61 (15.32) kg) with chronic ankle instability performed the Star Excursion Balance Test. Time-frequency information based on wavelet decomposition was used for analysing all signals. Findings: Dynamic balance impairment associated with chronic ankle instability was observed in the peak amplitude in the wavelet approximation as well as the absolute sum of the coefficients of the wavelet details of the acceleration, orientation and force signals. These results were found despite Star Excursion Balance Test performance during anterior, posteromedial and posterolateral excursions lead to similar specific reach distances in both limbs in either the chronic ankle instability or stable ankle groups. Interpretation: These parameters could be of great interest in detecting dynamic balance impairment in individuals at risk of sprains that might otherwise go undetected by only reach distance assessment. © 2009 Elsevier Ltd. All rights reserved. Source

Pallares J.G.,University of Castilla - La Mancha | Sanchez-Medina L.,Research and Sports Medicine Center | Perez C.E.,University of Murcia | De La Cruz-Sanchez E.,University of Murcia | Mora-Rodriguez R.,University of Castilla - La Mancha
Journal of Sports Sciences | Year: 2014

This study analysed the effect of imposing a pause between the eccentric and concentric phases on the biological within-subject variation of velocity- and power-load isoinertial assessments. Seventeen resistance-trained athletes undertook a progressive loading test in the bench press (BP) and squat (SQ) exercises. Two trials at each load up to the one-repetition maximum (1RM) were performed using 2 techniques executed in random order: with (stop) and without (standard) a 2-s pause between the eccentric and concentric phases of each repetition. The stop technique resulted in a significantly lower coefficient of variation for the whole load-velocity relationship compared to the standard one, in both BP (2.9% vs. 4.1%; P = 0.02) and SQ (2.9% vs. 3.9%; P = 0.01). Test-retest intraclass correlation coefficients (ICCs) were r = 0.61-0.98 for the standard and r = 0.76-0.98 for the stop technique. Bland-Altman analysis showed that the error associated with the standard technique was 37.9% (BP) and 57.5% higher (SQ) than that associated with the stop technique. The biological within-subject variation is significantly reduced when a pause is imposed between the eccentric and concentric phases. Other relevant variables associated to the load-velocity and load-power relationships such as the contribution of the propulsive phase and the load that maximises power output remained basically unchanged. © 2014 © 2014 Taylor & Francis. Source

Garcia-Fernandez M.,Spanish Royal Canoeing Federation | Sanchez-Medina L.,Pablo De Olavide University | Izquierdo M.,Research and Sports Medicine Center
European Journal of Applied Physiology | Year: 2010

This study was undertaken to compare training-induced changes in selected physiological, body composition and performance variables following two training periodization models: traditional (TP) versus block periodization (BP). Ten world-class kayakers were assessed four times during a training cycle over two consecutive seasons. On each occasion, subjects completed an incremental test to exhaustion on the kayak ergometer to determine peak oxygen uptake (VO 2peak), VO 2 at second ventilatory threshold (VO 2 VT2), peak blood lactate, paddling speed at VO 2peak (PS peak) and VT2 (PS VT2), power output at VO 2peak (Pw peak) and VT2 (Pw VT2), stroke rate at VO 2peak (SR peak) and VT2 (SR VT2) as well as heart rate at VO 2peak and VT2. Volume and exercise intensity were quantified for each endurance training session. Both TP and BP cycles resulted in similar gains in VO 2peak (11 and 8.1%) and VO 2 VT2 (9.8 and 9.4%), even though the TP cycle was 10 weeks and 120 training hours longer than the BP cycle. Following BP paddlers experienced larger gains in PS peak, Pw peak and SR peak than those observed with TP. These findings suggest that BP may be more effective than TP for improving the performance of highly trained top-level kayakers. Although both models allowed significant improvements of selected physiological and kayaking performance variables, the BP program achieved similar results with half the endurance training volume used in the TP model. A BP design could be a more useful strategy than TP to maintain the residual training effects as well as to achieve greater improvements in certain variables related to kayaking performance. © 2010 Springer-Verlag. Source

Garcia-Pallaris J.,University of Murcia | Sanchez-Medina L.,Pablo De Olavide University | PIrez C.E.,University of Murcia | Izquierdo-Gabarren M.,Orio Rowing and Research Center | Izquierdo M.,Research and Sports Medicine Center
Medicine and Science in Sports and Exercise | Year: 2010

PURPOSE: This study analyzed changes in neuromuscular, body composition, and endurance markers during 4 wk of tapering and subsequent 5 wk of reduced training (RT) or training cessation (TC). METHODS: Fourteen world-class kayakers were randomly assigned to either a TC (n = 7) or an RT group (n = 7). One-repetition maximum (1RM) strength, mean concentric velocity with 45% 1RM (V45%) in the bench press (BP) and prone bench pull (PBP) exercises, and body composition assessments were conducted at the start (T0) and end (T1) of a 43-wk training program, after tapering for the world championships (T2) and after TC or RT (T3). A graded exercise test on a kayak ergometer for determination of maximal oxygen uptake at T0, T1, and T3 was also performed. RESULTS: After tapering, no significant changes were observed in 1RM or V 45%. TC resulted in significantly greater declines in 1RM strength (-8.9% and-7.8%, P < 0.05, respectively, for BP and PBP) than those observed for RT (-3.9% and-3.4%). Decreases in V45% in BP and PBP were larger for TC (-12.6% and-10.0%) than for RT (-9.0% and-6.7%). Increases in sum of eight skinfolds were observed after both TC and RT, whereas declines in maximal aerobic power were lower for RT (-5.6%) than for TC (-11.3%). CONCLUSIONS: Short-term TC results in large decreases in maximal strength and especially V45% in highly trained athletes. These results suggest the need of performing a minimal maintenance program to avoid excessive declines in neuromuscular function in cases where a prolonged break from training is required. © 2010 by the American College of Sports Medicine. Source

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