Abbreviations: RPE, rating of perceived exertion; SSG, small-sided games; POMS, profile of mood state questionnaire; HR, heart rate
IntroductionUsually, most coaches used training exercises without the ball to develop soccer players' physical conditioning.
1More recently, scientific research showed that one can maintain or develop the physical capacity while soliciting concomitantly the technical and tactical parameters in the same training session by using soccer specific training exercises, which usually include game.2−4 Furthermore, apart from physiological benefits, SSGs may result in better motivation and developed more positive attitudes.5 The most evident distinction between SSG and other training methods is the presence of the ball, which imposes a specific training soliciting the physical, technical and tactical enhancement with high player enjoyment.6 It has recently been proposed that SSG should be positive for physiological, technical, tactical and psychological enhancement 7 and may be more effective than other training modality in plummeting the possibility of sensitive consequences associated with obtaining lack of mood state.8 Indeed, Los Arcos et al.7 reported that the participation in the SSG can develop both physiological responses and psychological of players. In the same perspective Selmi et al.5 indicated that SSG can be used as a specific type of training for elite soccer players allowing soccer-specifically intensively soliciting their physiological responses while sparing their mood state. During SSGs, the verbal coach encouragement is considered as external motivation provided by coaches and physical trainer. It has been shown to attain high commitment, positive behavior and training adherence for instance.9 To the best of our knowledge no studies examined the effects of the verbal coach encouragement on mood state. Indeed, the verbal coach encouragement would directly impact the physical intensity (such as rating of perceived exertion (RPE)) of players' activity.10 Other studies reported the importance of the verbal coach encouragement on the game intensity and the player's physiological response to SSG. Verbal encouragement is considered as external motivation provided by technical staff. It has been shown to attain high commitment, positive behavior and training adherence for instance, during high-intensity training.9 However, Rampinini et al.4 studied the effect of coaches' verbal encouragement in soccer players' on physiological responses during different modality of SSG: 3 vs. 3, 4 vs. 4, 5 vs. 5 and 6 vs. 6 players on small, medium and large pitches area. Researchers indicated that the heart rate (HR), blood lactate concentration (La) and RPE responses to SSG were significantly higher SSG with verbal coach encouragement in comparison with no-verbal coach encouragement during all SSG formats. Carrying out these various findings, the aim of this study is to compare the mood state, the RPE and %HRmax between SSG with verbal coach encouragement (SSGE) and without verbal coach encoura...