标题：Effect of the verbal interaction of the coach, decrease of the space and number of players in the cardiac frequency and in the subjective perception of the effort in Futsal
其他摘要：The aim of this study was to examine the impact of changes in pitch size/number of players on heart rate responses, subjective effort perception and technical requirements of small-sided futsal games. Eight male futsal players participated in the study (mean ± S.D.; age 11±0.9 years). All players participated in small-sided games on two different pitch sizes/number of players (SSG1 3x3, 12m×20 m; SSG2 4x4, 16m×20 m). Games consisted of 4×4 min of game play, interspersed by 3 min of active recovery. Heart rate measurements were made using a Polar Team System and for the registering of subjective effort perception it was used the OMNI- Resistance Exercise Scale. Each game was also filmed to evaluate the technical actions. These tapes were analysed using a hand notation system. Data were analyzed through independent samples t-tests. Statistical significance was set at 5%. All data were analyzed with the statistical package SPSS for Windows, release 16.0 (SPSS Inc., Chicago, IL). Mean ± S.D. heart rates for the two games were not significantly different between conditions (SSG1: 171±8; SSG2: 165±9). The technical actions that changed as a result of changes in pitch size/number of players were the number of passes (SSG1: 14±4; SSG2: 11±3.6, p<0.05) and receptions (SSG1: 10±4.8; SSG2: 8±3.3, p<0.05). The main conclusions of this study are that the reduction of the number of players and the dimension of the field promoted an increase in heart rate and a larger number of technical actions of the players in 3x3 in comparison to 4x4.
