Validity of the W170 test for predicting maximal oxygen intake.

Recent research has related pedalling frequency to perceived exertion, indicating that subjects pedalling at higher frequencies tend to perceive lower levels of exertion. If tests administered at higher pedalling speeds are valid, then more accurate data on extremely low fit individuals might be possible. The purpose of this study was to determine the validity of the Wahlund-Sjostrand W170 test administered at 50 and 80 rpm. Maximal oxygen intake was determined for thirty male volunteer college students using standard open-circuit techniques. W170 tests were administered at 50 and 80 rpm using standard test protocol. The results indicated a differential effect of pedalling speed upon the validity of the W170 tests. Validity coefficients of rxy = 0.73 and rxy = 0.64 were found for the 50 and 80 rpm tests, respectively. Maximal oxygen intake predicted from the W170 test administered at 80 rpm was significantly different from both the criterion maximal oxygen intake and the W170 prediction at 50 rpm. This difference was attributed to a significantly higher heart rate response to 80 rpm tests at the lower workload of 600 kpm/min. It was concluded that more valid W170 tests are attained at the conventional pedalling speed of 50 rpm.