<Originals>Assessment of Running Speed at Predicted Maximal Heart Rate (vHRmax.pred) in Trained Runners

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Purpose: The purpose of the present study was to verify whether vHRmax.pred (a running speed corresponding to a HRmax predicted by the formula [220-age (yrs)]) was a useful index of endurance performance. vHRmax.pred was comapared with V^^・o_2max, vV^^・o_2max (maximal aerobic running speed), vOBLA (running speed at a blood lactate level of 4mmol・L^<-1>) and running speed at exhaustion in 20 male master runners (46-70yrs), twelve young male runners (21-31yrs) and 25 junior male runners (12-18yrs). Methods: Physiological responses (V^^・o_2, HR and LT) were measured during progressive sub-maximal and maximal treadmill running. Running speeds corresponding to HRmax.pred, V^^・o_2max and OBLA were estimated from regression relating the individual's running speed to V^^・o_2, HR, and LA, respectively. Results: A statistically significant correlation (p<0.05) was admitted between vHRmax.pred and V^^・o_2max, vV^^・o_2max, vOBLA, RVE (running speed at the exhaustion or termination point) for the three groups and all participants, except between vHRmax.pred and relative V^^・o_2max for young runners, and relative V^^・o_2max and vOBLA for junior runners. Conclusion: It was suggested that vHRmax.pred was a potential index of endurance performance regardless of age.