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. 2013 Sep;4(3):175-80.
doi: 10.5812/asjsm.34255. Epub 2013 Mar 28.

Narita target heart rate equation underestimates the predicted adequate exercise level in sedentary young boys

Marefat Siahkouhian  1 , Davar Khodadadi  1
Affiliations

Narita target heart rate equation underestimates the predicted adequate exercise level in sedentary young boys

Marefat Siahkouhian et al. Asian J Sports Med. 2013 Sep.

Abstract

Purpose: Optimal training intensity and the adequate exercise level for physical fitness is one of the most important interests of coaches and sports physiologists. The aim of this study was to investigate the validity of the Narita et al target heart rate equation for the adequate exercise training level in sedentary young boys.

Methods: Forty two sedentary young boys (19.07±1.16 years) undertook a blood lactate transition threshold maximal treadmill test to volitional exhaustion with continuous respiratory gas measurements according to the Craig method. The anaerobic threshold (AT) of the participants then was calculated using the Narita target heart rate equation.

Results: Hopkin's spreadsheet to obtain confidence limit and the chance of the true difference between gas measurements and Narita target heart rate equation revealed that the Narita equation most likely underestimates the measured anaerobic threshold in sedentary young boys (168.76±15 vs. 130.08±14.36) (Difference ±90% confidence limit: 38.1±18). Intraclass correlation coefficient (ICC) showed a poor agreement between the criterion method and Narita equation (ICC= 0.03).

Conclusion: According to the results, the Narita equation underestimates the measured AT. It seems that the Narita equation is a good predictor of aerobic not AT which can be investigated in the future studies.

Keywords: Aerobic Threshold; Anaerobic Threshold; Heart Rate Performance Curve (HRPC); Training Intensity.

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Figures

Figure 1
Figure 1
RER curve during the GXT protocol in the subjects
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References

    1. Bodner ME, Rhodes EC. A review of the concept of the heart rate deflection point. Sports Med. 2000;30:31–46. - PubMed
    1. Amann M, Subudhi A, Foster C. Influence of testing protocol on ventilatory thresholds and cycling performance. Med Sci Sports Exerc. 2004;36:613–22. - PubMed
    1. Erdogan A, Cetin C, Karatosun H, et al. Non-invasive indices for the estimation of the anaerobic threshold of oarsmen. J Int Med Res. 2010;38:901–15. - PubMed
    1. Fabre N, Balestreri F, Pellegrini B, et al. The modified dmax method is reliable to predict the second ventilatory threshold in elite cross-country skiers. J Strength Cond Res. 2010;24:1546–52. - PubMed
    1. Fell JW. The modified D-max is a valid anaerobic threshold measurement in veteran cyclists. J Sci Med Sport. 2008;11:460–3. - PubMed

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