CPX/D underestimates VO2 in athletes compared with an automated Douglas bag system

被引:21
作者
Gore, CJ
Clark, RJ
Shipp, NJ
van der Ploeg, GE
Withers, RT
机构
[1] Australian Inst Sport, Henley Beach, SA 5022, Australia
[2] Flinders Univ S Australia, Sch Educ, Exercise Physiol Lab, Adelaide, SA 5001, Australia
[3] Royal Adelaide Hosp, Dept Thorac Med, Adelaide, SA 5000, Australia
关键词
oxygen consumption; indirect calortmetry; breath-by-breath; metabolic cart;
D O I
10.1249/01.MSS.0000079045.86512.C5
中图分类号
G8 [体育];
学科分类号
04 ; 0403 ;
摘要
Purpose: Based on persistent reports of low oxygen consumption (VO2) from Medical Graphics CPX/D metabolic carts, we compared the CPX/D against an automated Douglas bag system. Methods: Twelve male athletes completed three, randomized 25-min bouts (5 min at 100, 150, 200, 250, and 300 W) on a cycle ergometer with intervening 30-min rests. One bout was measured on each of the CPX/D, the CPX/D with altered software (CPX/DDelta), and an automated Douglas bag system at Flinders University (FU). The CPX/DDelta software alteration was an apparent lag time correction factor of 60 ms. Results: For the CPX/D, both VO2 and VCO2 were significantly lower than the FU system at 100-300 W, and the relative differences ranged -10.7 to -12.0% and -7.7 to -8.2%, respectively. Altering the software approximately halved the VO2 discrepancy between the CPX/DDelta and FU systems. When data from all five workloads were pooled, V-E of the CPX/D (67.2 +/- 26.4 L(.)min(-1)) and CPX/DDelta (67.5 +/- 26.9 L(.)min(-1)) were significantly lower than for the FU system (70.5 +/- 27.1 L(.)min(-1)); and at 300 W, the relative differences were -4.0% and -3.4% for the CPX/D and CPX/DDelta, respectively. Altering the software changed the pooled %O-2 from 16.24 +/- 0.40% for the CPX/D to 16.04 +/- 0.39% for the CPX/DDelta, and these were significantly different than pooled data for the FU system (16.15 +/- 0.39%). Conclusions: During submaximal exercise, the CPX/D yields VO2 values that are similar to11% lower than the criterion system, and the source of the discrepancy does not appear to be primarily related to volume measurement. A disturbing observation is that factory defaults for the lag time use different correction factors, which vary by 60 ms and this significantly alters VO2 and VCO2.
引用
收藏
页码:1341 / 1347
页数:7
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