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Bicycling but not walking is independently associated with fasting insulin in abdominally obese women.
Karolinska institutet.ORCID iD: 0000-0001-7335-3796​
2011 (English)In: Journal of Physical Activity and Health, ISSN 1543-3080, E-ISSN 1543-5474, Vol. 8, no 6, 820-3 p.Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: The impact of walking and bicycling on insulin resistance (IR) in women with abdominal obesity is unclear.

METHODS: Pooled analysis of data from a randomized trial on physically active commuting (bicycling + walking vs walking only) in women with abdominal obesity [n = 98; age:47.3 ± 7.6 yrs; waist circumference (WC):103.1 ± 7.8 cm]. Bicycling and walking data were collected during 7 consecutive days by trip meters (Trelock FC-410) and pedometers (Yamax digiwalker SW-200) at baseline, 2, 4, and 6 months. Owing to a skew distribution we analyzed bicycling as a binary dummy variable with a 10 km/week cut-off. Fasting serum insulin and homeostatic model assessment - insulin resistance (HOMA-IR) were assessed at baseline and 6 months, as were body mass index (BMI), WC, and dual x-ray absorptiometry (DXA)-assessed % whole-body fat.

RESULTS: Increased bicycling by 10 km/wk was associated with reductions in fasting serum insulin at follow-up independent of age, treatment allocation, baseline phenotype, Δ walking, and Δ % body fat (β = -10.9, P = .042), but not HOMA-IR (β = -2.0, P = .13). Increased walking was not associated with fasting serum insulin (P = .33) or HOMA-IR (P = .44) at follow-up, after adjustment for the same covariates and Δ bicycling.

CONCLUSION: Increased bicycling but not walking was associated with reduced insulin levels at follow-up. Bicycling may be more effective than walking for reducing insulin levels in abdominally obese women.

Place, publisher, year, edition, pages
2011. Vol. 8, no 6, 820-3 p.
National Category
Public Health, Global Health, Social Medicine and Epidemiology
Identifiers
URN: urn:nbn:se:gih:diva-4743PubMedID: 21832297OAI: oai:DiVA.org:gih-4743DiVA: diva2:1068881
Available from: 2017-01-26 Created: 2017-01-26 Last updated: 2017-01-31Bibliographically approved

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