Match internal load in youth elite soccer players is period, playing position and intermittent running capacity dependent

The aims of this study were: i) to verify whether player internal load (PIL) monitored via heart rate (HR) varies with game-time and playing position; ii) whether intermittent running capacity (IRC) is related to the maintenance of within-match PIL in elite youth (U-15) soccer players. Method: Twenty-one elite soccer players (14±0.5 yrs, 172±7 cm, 63±6 kg) had their heart rate monitored (beats/min) in five matches and were tested twice for IRC (Yo-YoIR2, distance [m]) over a seven-week competitive season. Percentage of maximal heart rate (%HRmax) and time spent (TS%) in five zones (Z1[<70%]; Z2[71-85%]; Z3[86-90%]; Z4[91-95%] and Z5[>96%]) were our PIL indexes. Data from three complete games in the same position of each player were analyzed and matches halves, time intervals (T1 to T6), and playing positions (fullbacks, central defenders and forwards [N=5 each], midfielders [N=6]) were compared, and the relationship between IRC and within-match PIL was determined. Results: PIL was higher in 1st (86±3%) than in the 2nd half (84±4%; p<.001). The 2nd half had more TS% in Z1 and Z2 (p<.05). PIL in T4 was the lowest (p<.01), and in T6, it was lower than T1 and T2 (p<.01). Fullbacks and midfielders showed higher PIL and higher TS% in Z4 (p<.05) than the other positional roles. The average IRC correlated with PIL in T6 (r=.56, p<.01) only. Conclusion: In conclusion, the internal load in elite youth (U-15) soccer players varies with game-time and playing position; and their IRC is related to the maintenance of within-match PIL.(AU)

Comparação entre a PSE planejada pelo treinador com a percebida por jovens atletas de atletismo / Comparison between the RPE planned by coach with perceived by youth athletes of track and field

O sucesso do treinamento esportivo para jovens depende, também, de uma relação ótima entre a intensidade da sessão de treinamento prescrita pelo treinador e percebida pelo atleta, desta maneira, o objetivo do trabalho foi comparar a percepção subjetiva de esforço (PSE) indicada por jovens atletas de atletismo com a planejada pelo treinador para sessão de treinamento. Participaram do estudo 28 voluntários, de ambos os sexos, atletas de atletismo com pelo menos seis meses de treinamento, com média de idade 14,0 ± 1,32 anos, massa corporal 52,4 ± 11,5 e estatura 162,7 ± 9,3 cm, e o treinador da equipe, que tinha seis anos de experiência. O treinador apresentou previamente a execução do treinamento a PSE planejada para cada atleta, e a PSE dos jovens foi coletada 30 minutos após o término de cada sessão. A PSE planejada pelo treinador foi diferente da indicada pelo atleta (3,6 ± 1,2 e 3,1 ± 1,54, respectivamente) e também nas três intensidades; leve 1,80 ± 0,41 e 2,92 ± 1,13, moderada 3,54 ± 0,72 e 4,19 ± 1,45 e forte 7,35 ± 1,33 e 4,46 ± 0,63, respectivamente. Os jovens participantes deste trabalho percebem valores distintos de PSE quando comparada com a planejada pelo treinador, sendo que, para as intensidades leve e moderada sua PSE é menor e para a intensidade pesada é maior do que a planejada. Preconiza-se que haja acompanhamento diário das intensidades percebidas pelos atletas de atletismo durante o treinamento e também comparação constante com o que é planejado pelo treinador...(AU)

The success of sport training for young athletes, also depends, a great relationship between the intensity of the training session prescribed by coach and perceived by athlete, in this way, the aim of this study was to compare the rate of perceived exertion (RPE) indicated by the athlete and coach was planned to training session. The study included 28 healthy volunteers of both sexes , track and field athletes with at least 6 months of training, mean age 14.0 ± 1.32 years, body mass 52.4 ± 11.5 and 162.7 ± height 9.3 cm, and the coach of the team, he had 6 years of experience. The coach had previously done the training PSE planned for each athlete, and PSE youth was collected 30 minutes after the end of each session. The PSE planned by the coach was different from the athlete indicates (3.6 ± 1.2 e 3.1 ± 1.54, respectively), and also in the three intensities; Lightweight 1.80 ± 0.41 and 2.92 ± 1.13 , moderate 3.54 ± 0.72 and 4.19 ± 1.45 strong and 7.35 ± 1.33 and 4.46 ± 0.63, respectively. The young participants of this study perceive different values of RPE compared with planned by the coach and for low and moderate intensities, his RPE is smaller and the strong intensity is higher than planned. We recommend that there is daily monitoring of intensities perceived by track and field athletes during the training and also regular comparison between coaches planned and athletes perceived...(AU)