Abstract:
PURPOSE:The aims of this study were to: (1) determine the relationships between maximum oxygen uptake ([Formula: see text]O2max) and walking economy during non-graded and graded walking among overweight women and (2) examine potential differences in [Formula: see text]O2max and walking economy before and after weight loss. METHODS:One-hundred and twenty-four premenopausal women with a body mass index (BMI) between 27 and 30 kg/m2 were randomly assigned to one of three groups: (a) diet only; (b) diet and aerobic exercise training; and (c) diet and resistance exercise training. All were furnished with standard, very-low calorie diet to reduce BMI to < 25 kg/m2. [Formula: see text]O2max was measured using a modified-Bruce protocol while walking economy (1-net [Formula: see text]O2) was obtained during fixed-speed (4.8 k·h-1), steady-state treadmill walking at 0% grade and 2.5% grade. Assessments were conducted before and after achieving target BMI. RESULTS:Prior to weight loss, [Formula: see text]O2max was inversely related (P < 0.05) with non-graded and graded walking economy (r = - 0.28 to - 0.35). Similar results were also observed following weight loss (r = - 0.22 to - 0.28). Additionally, we also detected a significant inverse relationship (P < 0.05) between the changes (∆, after weight loss) in ∆[Formula: see text]O2max, adjusted for fat-free mass, with non-graded and graded ∆walking economy (r = - 0.37 to - 0.41). CONCLUSIONS:Our results demonstrate [Formula: see text]O2max and walking economy are inversely related (cross-sectional) before and after weight loss. Importantly though, ∆[Formula: see text]O2max and ∆walking economy were also found to be inversely related, suggesting a strong synchrony between maximal aerobic capacity and metabolic cost of exercise.
journal_name
Eur J Appl Physioljournal_title
European journal of applied physiologyauthors
Borges JH,Carter SJ,Singh H,Hunter GRdoi
10.1007/s00421-018-3888-xsubject
Has Abstractpub_date
2018-08-01 00:00:00pages
1573-1578issue
8eissn
1439-6319issn
1439-6327pii
10.1007/s00421-018-3888-xjournal_volume
118pub_type
杂志文章,随机对照试验abstract::Microdialysis presents the unique possibility to measure metabolite concentrations in human interstitial fluid. During exercise, the recovery of these metabolites should be precisely monitored since it is known to increase greatly with muscle blood flow. The loss of ethanol, perfused at low concentration, can be accur...
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journal_title:European journal of applied physiology
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