Study on the Consistency of Modified Conconi Exercise Lactate Threshold,Ventilation Threshold and Heart Rate Deviation Point among Students Aged 13～18 Year Old at Different Altitudes
Objective:This study aims to investigate the consistency of indicators related to the Heart Rate Devi-ation Point(HRDP),Ventilatory Threshold(VT),and Lactate Threshold(LT)in the modified Conconi test among adolescents aged 13～18 at varying altitudes.It seeks to propose a straightforward,non-invasive,and universal-ly applicable method for assessing aerobic endurance training suitability among students residing at high and sub-high altitudes.Method:A total of 113 students from high altitude(Hi group),120 from sub-high altitude(Sub Hi group),and 120 from a control group(Con group),all aged 13～18,were selected as participants.Modi-fied Conconi tests were conducted using a grade 8 protocol with 3 minutes per grade and an initial speed of 6 m·s-1,with 1 minute intervals between stages.Heart rate,blood lactate levels,and lung ventilation data were collected immediately after each exercise load.The Bland-Altman method was employed for analysis to assess consisten-cy.Results:All participant groups exhibited LT,VT,and HRDP phenomena during the Conconi test.Among fe-males in the Sub Hi group,there was a delayed LT phenomenon.Female students demonstrated earlier VT1 and VT2 compared to males.Male students exhibited higher HRDP speeds than females,with the Sub Hi group show-ing higher HRDP speeds than the Con and Hi groups.Younger subjects had lower HRDP speeds than older sub-jects.Pearson analysis indicated significant correlations between LT,VT,and HRDP across all altitude groups and genders(r≥0.50,P<0.05).Bland-Altman tests revealed weighted κ values exceeding 0.60 for all groups and genders,with less than 1％of observation samples falling outside the consistency limit range.Mean deviation tended towards zero,indicating strong consistency among LT,VT,and HRDP indicators.Conclusion:The modi-fied Conconi test demonstrates high correlation and consistency in assessing LT,VT,and HRDP among adoles-cents aged 13～18 at different altitudes.Thus,HRDP in the Conconi test can serve as an effective indicator for evaluating anaerobic threshold in students residing at high and sub-high altitudes.
improved Conconi exercisemiddle school studentsaltitudeLactate ThresholdVentilatory Thresh-oldHeart Rate Deflection Point
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