Skip Navigation LinksHome > February 2007 - Volume 39 - Issue 2 > Relationship between %HRmax, %HR Reserve, %V˙O2max, and %V˙O...
Medicine & Science in Sports & Exercise:
doi: 10.1249/01.mss.0000246996.63976.5f
APPLIED SCIENCES: Physical Fitness and Performance

Relationship between %HRmax, %HR Reserve, %V˙O2max, and %V˙O2 Reserve in Elite Cyclists

LOUNANA, JOSEPH1; CAMPION, FREDERIC1; NOAKES, TIMOTHY D.2; MEDELLI, JEAN1

Collapse Box

Abstract

Purpose: To evaluate the relations between %HRmax, %HRR, %V˙O2max, and %V˙O2R in elite cyclists and to check whether the intensity scale recommended by ACSM in its 1998 position stand is also applicable to this specific population.

Methods: Twenty-six male elite road cyclists (25.1 ± 0.7 yr, 71.0 ± 1.2 kg, 70.9 ± 1.2 mL·kg−1·min−1, 433.9 ± 9.8 W) performed an incremental maximal exercise test (50 W·3 min−1). Individual linear regressions based on HR and V˙O2 values measured at rest, end of each stage, and maximum, were used to calculate slopes and intercepts, and to predict %HRmax, %HRR, %V˙O2max, or %V˙O2R for a given exercise intensity.

Results: Below 85% V˙O2max or V˙O2R, predicted %HRmax values were significantly higher (P < 0.001) than the ACSM intensity scale (58, 65, 73, and 87% vs 55, 62, 70, and 85% HRmax at 40, 50, 60, and 80% V˙O2max, and 48, 61, 74% vs 35, 55, and 70% HRmax at 20, 40, and 60% V˙O2R). The %HRR versus %V˙O2max regression mean slope (1.069 ± 0.01) and intercept (−5.747 ± 0.80) were significantly different (P < 0.0001) from 1 and 0, respectively. Conversely, the %HRR versus %V˙O2R regression was indistinguishable from the line of identity (mean slope = 1.003 ± 0.01; mean intercept = 0.756 ± 0.7). Predicted %V˙O2R values were equivalent to %HRR in the 35-95%HRR range. %V˙O2max was equivalent to %HRR at and above 75%HRR, and it was significantly higher at (P < 0.05) and below 65%HRR (P < 0.001).

Conclusion: The intensity scale recommended by ACSM underestimates exercise intensity in elite cyclists. Prediction of %HRR by %V˙O2R is better than by %V˙O2max. Thus, elite cyclists should use %HRR in relation to %V˙O2R rather than in relation to %V˙O2max.

©2007The American College of Sports Medicine

Login

Article Tools

Share

Search for Similar Articles
You may search for similar articles that contain these same keywords or you may modify the keyword list to augment your search.

Connect With Us