Assessment of child-specific aerobic fitness and anaerobic capacity by the use of the power-time relationships constants.

This study first aimed to compare critical power (CP) and anaerobic work capacity (AWC), to laboratory standard evaluation methods such as maximal oxygen uptake (VO(2)max) and maximal accumulated oxygen deficit (MAOD). Secondly, this study compared child and adult CP and AWC values. Subjects performed a maximal graded test to determine VO(2)max and maximal aerobic power (MAP); and four constant load exercises. In children, CP (W * kg(-1)) was related to VO(2)max (ml * kg(-1) * min(-1); r = .68; p = .004). AWC (J * kg(-1) in children was related to MAOD (r = .58; p = .018). Children presented lower AWC (J * kg(-1); p = .001) than adults, but similar CP (%MAP) values. CP (%MAP and W * kg(-1) and AWC (J * kg(-1) were significantly related to laboratory standard evaluation methods but low correlation indicated that they cannot be used interchangeably. CP (%MAP) was similar in children and adults, but AWC (J * kg(-1) was significantly lower in children. These conclusions support existing knowledge related to child-adults characteristics.