The efficacy of a verification stage for determining V˙O2max and the impact of sampling intervals

IF 2.3 Q2 SPORT SCIENCES
Emily J. Kontos, Nicholas D. Luden, Stephanie Kurti, Christopher J. Womack
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引用次数: 0

Abstract

It is unknown whether oxygen uptake (V̇O2) sampling intervals influence the efficacy of a verification stage following a graded exercise test (GXT). Fifteen females and 14 males (18–25 years) completed a maximal treadmill GXT. After a 5 ​min recovery, the verification stage began at the speed and grade corresponding with the penultimate stage from the GXT. Maximal oxygen consumption (V̇O2max) from the incremental GXT (iV̇O2max) and V̇O2max from the verification stage (verV̇O2max) were determined using 10 seconds (s), 30 ​s, and 60 ​s from breath ​× ​breath averages. There was no main effect for V̇O2max measure (iV̇O2maxvs. verV̇O2max) 10 ​s ([47.9 ​± ​8.31] ml∙kg−1∙min−1 vs [48.85 ​± ​7.97] ml∙kg−1∙min−1), 30 ​s ([46.94 ​± ​8.62] ml∙kg−1∙min−1 vs [47.28 ​± ​7.97] ml∙kg−1∙min−1), and 60 ​s ([46.17 ​± ​8.62] ml∙kg−1∙min−1 vs [46.00 ​± ​8.00] ml∙kg−1∙min−1]. There was a stage ​× ​sampling interval interaction as the difference between (verV̇O2max−iV̇O2max) was greater for 10-s than 60-s sampling intervals. The verV̇O2max was > 4% higher than iV̇O2maxin 31%, 31%, and 17% of the tests for the 10-s, 30-s, and 60-s sampling intervals respectively. Sensitivity for the plateau was < 30% for 10-s, 30-s, and 60-s sampling intervals. Specificity ranged from 44% to 60% for all sampling intervals. Sensitivity for heart rate ​+ ​respiratory exchange ratio was > 90% for all sampling intervals; while specificity was < 25%. Findings from the present study suggest that the efficacy of verification stages for eliciting a higher V̇O2max may be influenced by the sampling interval utilized.

验证阶段对确定V˙O2max的有效性和采样间隔的影响
目前尚不清楚吸氧量(V̇O2)采样间隔是否会影响分级运动测试(GXT)后验证阶段的疗效。15名女性和14名男性(18-25岁)完成了最大跑台GXT。在5​min恢复,验证阶段以与GXT倒数第二阶段相对应的速度和等级开始。增量GXT的最大耗氧量(V̇O2max)(iV \775 O2max​s、 和60​s来自呼吸​×​呼吸平均值。对V̇O2max测量没有主要影响(iV \775 O2maxvs.verV \771 O2max)10​s([47.9​±​8.31]ml∙kg−1∙min−1 vs[48.85​±​7.97]ml∙kg−1∙min−1),30​s([46.94​±​8.62]ml∙kg−1∙min−1 vs[47.28​±​7.97]ml∙kg−1∙min−1)和60​s([46.17​±​8.62]ml∙kg−1∙min−1 vs[46.00​±​8.00]毫升∙千克−1∙分钟−1]。有一个舞台​×​采样间隔相互作用,因为(verV̇O2max−iV \775 O2max)之间的差异在10s大于60s的采样间隔。verV̇O2max为>;在10秒、30秒和60秒的采样间隔内,iV̇O2maxin分别比31%、31%和17%的测试高4%。对平台的敏感性为<;10秒、30秒和60秒采样间隔为30%。所有采样间隔的特异性在44%至60%之间。心率敏感性​+​呼吸交换率>;所有采样间隔为90%;而特异性<;25%。本研究的结果表明,引发更高V̇O2max的验证阶段的有效性可能受到所使用的采样间隔的影响。
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来源期刊
Sports Medicine and Health Science
Sports Medicine and Health Science Health Professions-Physical Therapy, Sports Therapy and Rehabilitation
CiteScore
5.50
自引率
0.00%
发文量
36
审稿时长
55 days
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