Abstract:
BACKGROUND:To determine the trustworthiness of graded exercise test to exhaustion (GXT) to assess maximal oxygen uptake ( V ˙ O 2 max ) in metabolic syndrome individuals with obesity and poor cardiorespiratory fitness. METHODS: V ˙ O 2 max was assessed in 100 metabolic syndrome adults (57 ± 8 years; 34% women), with obesity (BMI 32 ± 5 kg·m-2 ) using GXT followed by supramaximal constant-load verification test (VerT) at 110% of maximal GXT work rate. V ˙ O 2 data from GXT and VerT were compared using paired t test and plotted for Bland-Altman analysis. GXT sensitivity and specificity to detect V ˙ O 2 max were also calculated. RESULTS:Seventy individuals did not achieve V ˙ O 2 plateau during GXT. GXT underestimated V ˙ O 2 max in 40 subjects. In these subjects, the magnitude of V ˙ O 2 max underestimation with GXT was 9% (167 mLO2 ·min-1 ; P < .001). In the whole sample (n = 100), bias error differences between GXT and VerT was 63 mLO2 ·min-1 (3% underestimation). This error was constant regardless of differences in fitness levels among individuals (R = -0.07; homoscedasticity). GXT results were unreliable in 62% of the sample with 16% of false-positive and 46% of false-negative results. Sensitivity and specificity of GTX to assess V ˙ O 2 max were low (ie, 23% and 60%, respectively). CONCLUSION:Our data indicate that the magnitude (3%-9%) and prevalence (40% of subjects) of V ˙ O 2 max underestimation with the use of a GXT alone is high in a large sample of unfit metabolic syndrome individuals with obesity. Our data advocate for the need of using VerT after GXT to avoid significant cardiorespiratory fitness underestimation in metabolic syndrome individuals with obesity and low fitness level.
journal_name
Scand J Med Sci Sportsjournal_title
Scandinavian journal of medicine & science in sportsauthors
Moreno-Cabañas A,Ortega JF,Morales-Palomo F,Ramirez-Jimenez M,Mora-Rodriguez Rdoi
10.1111/sms.13602subject
Has Abstractpub_date
2020-03-01 00:00:00pages
583-590issue
3eissn
0905-7188issn
1600-0838journal_volume
30pub_type
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