AComparison of the Point of Deflection from Linearity of Heart and the Ventilatory Threshold in the Determination of the Anaerobic Threshold in Indian Boys

The purpose ofthe study was to asscss whcthcr the point of deilection from linearjty of heart rate (HRD) could bc uscd as an alternative method to determine the ventilatory threshold (VT) in Indian (Bengali) boys that rcprcscnts thc detcrmination of the anaerobic threshold (M), and also to standardize an cxcrcise test to be efTt]ctive in eliciting AT in Indian (Bensali) boys by using HRD. [[",enty six (26) beys with a mean age of 12,8 (± 1,18) years perforrned a graded ' maximal exercise tcst on a treadmill to determine peak V02, HRD and VT. The mean peak V02, weight related peak VO,, peak pulmenary ventilation, and pcak heart rate of the boys were found to be 1.751,'min, 47.1ml/kg/min. 66.9limin and 200.2beatshnin rcspcctivcly. There were no signiticant differences between mean VO?, wcight rclatcd V02, pulmonary ventilation {VE), heart rate and rcspiratory cxchaiige ratio ' (RER) that were measured at VT and HRD, The mean V02 mcasured at VT and HRD was fbund to be 1,46 and 1.45 Limin, which were about 84% and 83% of their rcspcctivc pcak va]ucs. Linear regression analysis revealed a correlation of O.94 (p<e.O[) between V02 measured at VT and SiO, measured at HRD, so the present study indicates that the point of deflection from lincarity of heart rate (HRD) may be an accurate predictor of VT in most but not all boys. J Ph.vsiol AnthFqpol 26aY.' 31-3Z 2007 httpillwww,jstage.jst,go,jp/ browseijpa2 [DOI: le.2114ijpa226,31]