Different cardiorespiratory fitness expressions based on the maximal cycle ergometer test show no effect on the relation of cardiorespiratory fitness to the academic achievement of nine-year-olds | PLOS ONE
![Young woman carries out an ergometer test in the medical practise - Young woman on an ergometer in the surgery, Junge Frau führt einen Ergometer-Test Stock Photo - Alamy Young woman carries out an ergometer test in the medical practise - Young woman on an ergometer in the surgery, Junge Frau führt einen Ergometer-Test Stock Photo - Alamy](https://c8.alamy.com/comp/JGMEHD/young-woman-carries-out-an-ergometer-test-in-the-medical-practise-JGMEHD.jpg)
Young woman carries out an ergometer test in the medical practise - Young woman on an ergometer in the surgery, Junge Frau führt einen Ergometer-Test Stock Photo - Alamy
![Young woman carries out an ergometer test in the medical practise - Young woman on an ergometer in the surgery, Junge Frau führt einen Ergometer-Test Stock Photo - Alamy Young woman carries out an ergometer test in the medical practise - Young woman on an ergometer in the surgery, Junge Frau führt einen Ergometer-Test Stock Photo - Alamy](https://c8.alamy.com/comp/JGMEAP/young-woman-carries-out-an-ergometer-test-in-the-medical-practise-JGMEAP.jpg)