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Imposing a pause between the eccentric and concentric phases increases the reliability of isoinertial strength assessments |
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| Authors: | Jesús G Pallarés Luis Sánchez-Medina Carlos Esteban Pérez Ernesto De La Cruz-Sánchez Ricardo Mora-Rodriguez |
| Institution: | 1. Exercise Physiology Laboratory, University of Castilla-La Mancha, Toledo, Spainjesus.garcia.pallares@gmail.com;3. Studies, Research and Sports Medicine Centre, Government of Navarre, Pamplona, Spain;4. Sports Medicine Centre, University of Murcia, Murcia, Spain;5. Department of Physical Activity and Sport, University of Murcia, Murcia, Spain;6. Exercise Physiology Laboratory, University of Castilla-La Mancha, Toledo, Spain |
| Abstract: | AbstractThis 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. |
| Keywords: | resistance training muscle strength maximal power output bench press full squat |