Abstract:
This study examined the validity of the Yo-yo Intermittent Endurance
Test (Level l; YYIET) as indicator of aerobic power in
youth soccer players. Cardiorespiratory responses were determined
in 18 moderately trained nonelite youth soccer players
(age, 16.6 +- 0.8 years; height, 178.7 +- 6.2 cn; body mass, 69.8
+- 6.0 kg; Vo.peak, 52.8 +- 7.4 ml·kg-1·min-1) while performing
the YYIET and an incremental treadmill test. Maximal heart
rate (Hlcmaxi, respiratory exchange ratio (RER), O2 pulse,
Vo2peak, and maximal ventilation (VEmax) were measured.
Group YYIET V02peak, HRmax, RER, and O2 pulse were not
significantly diffeient from treadmill responses (p > 0.05). YEmax
was significantly lower (p < 0.05) during the YYIET compared
to the treadmill condition. No significant correlation was
found between treadmill Vozpeak and YYIET performance (p >
0.05). This study showed that the YYIET elicits peak vo, and
HR responses. However, YYIET performance results were not
related to V02peak measured in laboratory. Furthermore, the
individual V02peak reached during the TM did not reflect the
Vo.peak obtained during the YYIET, as shown by the large limits
of agreement. As a consequence, compared to other shuttle
run field tests, YYIET seems to be a weak indicator of aerobic
power in youth moderately trained youth soccer player.
