Key result
Fat mass and LDL explain 30% of exercise capacity variance in bariatric surgery candidates.
Why the study?
Individuals with obesity can have metabolic disorders affecting exercise ability, prompting investigation into how body composition and metabolic and lipid profiles influence maximal and submaximal functional test performance.
Do different functional tests (ITMT, 6MWT, 2MST) elicit different metabolic and cardiovascular responses in obese candidates for bariatric surgery?
Cross-Sectional (n=44)
No
Do different functional tests (ITMT, 6MWT, 2MST) elicit different metabolic and cardiovascular responses in obese candidates for bariatric surgery?
In obese candidates for bariatric surgery, the 2-minute step test elicits higher metabolic and chronotropic demands than the 6-minute walk test, making it a viable submaximal alternative when maximal testing is not feasible.
Answers are grounded in this paper and cite their sources.
Fat mass and LDL may influence VO2 in bariatric candidates; leaves open causal effects and intervention targets for prospective study.
Individuals with obesity can have metabolic disorders and may develop impairments that affect the ability to exercise. The maximal incremental cardiopulmonary exercise test is widely used to assess functional capacity. However, submaximal tests such as the two-minute step test (2MST) and the six-minute walk test (6MWT) also allow this assessment. We propose to analyze whether body composition, metabolic and lipid profile influence the maximal and submaximal performance, and investigate these variables in response to different functional tests. Forty-four individuals with obesity, aged 18–50 years, underwent analysis of body composition, metabolic and lipid profile, incremental treadmill test (ITMT), 6MWT, and 2MST. One-way ANOVA, Pearson or Spearman correlation, and Stepwise multiple linear regression analysis were performed. ITMT induced a greater metabolic, ventilatory, cardiovascular, and perceived exertion demand when compared to the 6MWT and 2MST (p < 0.05). In addition, 2MST elicited a higher chronotropic (HR) and metabolic (V̇O 2 ) demand when compared to the 6MWT (p < 0.05). Significant correlations were found between tests and body composition, metabolic and lipid profile. Fat mass and low-density lipoprotein can explain 30% of the V̇O 2 variance in the ITMT; and fat mass, glucose, and performance in the 2MST can explain 42% of the variance of the distance walked in the ITMT. Obesity and its metabolic impairments are capable of influencing responses to exercise. ITMT generated greater demand due to the high stress imposed, however, 2MST demanded greater metabolic and chronotropic demand when compared to the 6MWT.
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Ricci et al. (2021) conducted a cross-sectional in Obesity (candidates for bariatric surgery) (n=44). Incremental treadmill test (ITMT) vs. Six-minute walk test (6MWT) and two-minute step test (2MST) was evaluated on Variance in V̇O2 peak during ITMT explained by fat mass and LDL (R2 0.30, p=<0.05). Fat mass and low-density lipoprotein explained 30% of the variance in maximal oxygen uptake during the incremental treadmill test in candidates for bariatric surgery.
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