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 Vol 1: Use of the HR index to predict maximal oxygen uptake during different exercise protocols.


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This article is from Physiological Reports, volume 1.AbstractThis study examined the ability of the HRindex model to accurately predict maximal oxygen uptake O2max across a variety of incremental exercise protocols. Ten men completed five incremental protocols to volitional exhaustion. Protocols included three treadmill Bruce, UCLA running, Wellness Fitness Initiative WFI, one cycle, and one field shuttle test. The HRindex prediction equation METs = 6 × HRindex − 5, where HRindex = HRmax-HRrest was used to generate estimates of energy expenditure, which were converted to body mass-specific estimates of O2max. Estimated O2max was compared with measured O2max. Across all protocols, the HRindex model significantly underestimated O2max by 5.1 mL·kg−1·min−1 95% CI: −7.4, −2.7 and the standard error of the estimate SEE was 6.7 mL·kg−1·min−1. Accuracy of the model was protocol-dependent, with O2max significantly underestimated for the Bruce and WFI protocols but not the UCLA, Cycle, or Shuttle protocols. Although no significant differences in O2max estimates were identified for these three protocols, predictive accuracy among them was not high, with root mean squared errors and SEEs ranging from 7.6 to 10.3 mL·kg−1·min−1 and from 4.5 to 8.0 mL·kg−1·min−1, respectively. Correlations between measured and predicted O2max were between 0.27 and 0.53. Individual prediction errors indicated that prediction accuracy varied considerably within protocols and among participants. In conclusion, across various protocols the HRindex model significantly underestimated O2max in a group of aerobically fit young men. Estimates generated using the model did not differ from measured O2max for three of the five protocols studied; nevertheless, some individual prediction errors were large. The lack of precision among estimates may limit the utility of the HRindex model; however, further investigation to establish the models predictive accuracy is warranted.



Autor: Haller, Jeannie M; Fehling, Patricia C; Barr, David A; Storer, Thomas W; Cooper, Christopher B; Smith, Denise L

Fuente: https://archive.org/







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