Reproducibility of Running Anaerobic Sprint Test for soccer players.
BACKGROUND
Although the Running Anaerobic Sprint Test (RAST) presents reliability when performed on firmer surfaces (i.e. athletic track), its application on less rigid surfaces can compromise the measure determinations. Thus, the aim of the present study was to evaluate the RAST reliability for soccer players performing on grass, and wearing soccer cleats.


METHODS
Fourteen soccer players (16±1 years, 72.3±10.3 kg, 177.2±8.4 cm, 14.5±5.3% of fat mass, and VO2MAX of 52.0±5.1 mL∙kg-1∙min-1) performed six maximal 35-meter effort interspersed by 10s of passive rest (RAST). After 48h the RAST was repeated to test the reliability. The main variables analyzed were the peak power (PP), mean power (MP), fatigue indexes (FI), and impulse (ImP). The reproducibility of test and re-test was tested through the Student's t Test to paired samples, intraclass correlation (ICC), typical error (TE), and coefficient of variation (CV%).


RESULTS
The PP (test=701.4±169.5 W; re-test 712.4±142.3 W), MP (test=538.6±111.4 W; re-test=551.9±101.1 W), and the ImP (test=2841.2±461.8 N∙s; re-test=2797.2±575.9 N∙s) were not different, presented significant correlation between the situations (ICC=0.88; 0.96 e 0.93; respectively), and low values of TE (71.9 W; 30.6 W e 191.1 N∙s, respectively) and CV% (10.2%; 5.9% e 6.8%, respectively). The FI (test=40.1±5.8; re-test=38.7±7.7%) were not significantly related between the test and re-test, and presented high TE (5.7%) and CV% (14.4%).


CONCLUSIONS
We can conclude that RAST presents high reliability when performed on grass with soccer cleats, just as rigid surfaces. Besides, the ImP is more robust than the.
Faculty of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil - mpapoti@usp.br.
Vitor L
VL
De Andrade
Paul R Pereira
PR
Santiago
Carlos A
CA
Kalva Filho
Eduardo Zapaterra
EZ
Campos
Marcelo
M
Papoti
D000293:Adolescent; D015308:Anaerobic Threshold; D004777:Environment; D005080:Exercise Test / Q000379:methods*; D005221:Fatigue / Q000503:physiopathology; D006801:Humans; D015203:Reproducibility of Results; D012420:Running / Q000502:physiology*; D012775:Shoes; D012916:Soccer / Q000502:physiology*; D019876:Sports Equipment