Henrique P Neiva1, Mário C Marques1, Tiago M Barbosa2, Mikel Izquierdo3, João L Viana4, Daniel A Marinho1. 1. University of Beira Interior, Department of Sport Sciences, Portugal; Research Center in Sport Sciences, Health Sciences and Human Development, CIDESD, Portugal. 2. Research Center in Sport Sciences, Health Sciences and Human Development, CIDESD, Portugal; National Institute of Education, Nanyang Technological University, Singapore. 3. Department of Health Sciences, Public University of Navarre, Spain. Electronic address: mikel.izquierdo@gmail.com. 4. Research Center in Sport Sciences, Health Sciences and Human Development, CIDESD, Portugal; University Institute of Maia, ISMAI, Portugal.
Abstract
OBJECTIVES: The aim of this study was to compare the effect of 10min vs. 20min passive rest post warm-up on performance in a 100m freestyle time-trial. DESIGN: Randomized crossover. METHODS:Eleven competitive male swimmers performed two experimental trials on different days, consisting of 100m freestyle time-trials following 10min or 20min passive rest after a standard 1200m warm-up. Performance (time-trial), biomechanical (stroke length, stroke frequency, stroke index, propelling efficiency), physiological (blood lactate concentrations, heart rate, core and tympanic temperature), and psychophysiological (perceived effort) variables were assessed during both trials. RESULTS:Time-trial performance was faster after 10min as opposed to 20min passive rest (58.41±1.99s vs. 59.06±1.86, p<0.01). This was supported by strong effect sizes (d=0.99) and the qualitative indication of "likely" positive effects. Heart rate before the time-trial was also higher after 10min passive rest (89±12bpm vs. 82±13bpm; p<0.01). Furthermore, net core temperature and oxygen uptake values before the time-trial were substantially lower after 20min passive rest. CONCLUSIONS: These data suggest that the 10min post warm-up passive rest enhances 100m freestyle performance when compared to a 20min period. An improvement that appears to be mediated by the combined effects of a shorter post warm-up period on core temperature, heart rate and oxygen uptake.
RCT Entities:
OBJECTIVES: The aim of this study was to compare the effect of 10min vs. 20min passive rest post warm-up on performance in a 100m freestyle time-trial. DESIGN: Randomized crossover. METHODS: Eleven competitive male swimmers performed two experimental trials on different days, consisting of 100m freestyle time-trials following 10min or 20min passive rest after a standard 1200m warm-up. Performance (time-trial), biomechanical (stroke length, stroke frequency, stroke index, propelling efficiency), physiological (blood lactate concentrations, heart rate, core and tympanic temperature), and psychophysiological (perceived effort) variables were assessed during both trials. RESULTS: Time-trial performance was faster after 10min as opposed to 20min passive rest (58.41±1.99s vs. 59.06±1.86, p<0.01). This was supported by strong effect sizes (d=0.99) and the qualitative indication of "likely" positive effects. Heart rate before the time-trial was also higher after 10min passive rest (89±12bpm vs. 82±13bpm; p<0.01). Furthermore, net core temperature and oxygen uptake values before the time-trial were substantially lower after 20min passive rest. CONCLUSIONS: These data suggest that the 10min post warm-up passive rest enhances 100m freestyle performance when compared to a 20min period. An improvement that appears to be mediated by the combined effects of a shorter post warm-up period on core temperature, heart rate and oxygen uptake.
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