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Validation of a lifestyle-based risk score for type 2 diabetes mellitus in Australian adults.

ABSTRACT: The study aimed to assess the performance of a lifestyle-based prognostic risk model (Diabetes Lifestyle Score) for the prediction of 5-year risk of type 2 diabetes mellitus. The model comprises nine self-reported predictors (sex, age, antihypertensive drugs, body mass index, family history of diabetes, physical activity, fruits, vegetables, and wholemeal/brown bread). We conducted an external validation and update of the model in an Australian cohort including 97,615 residents of New South Wales aged 45 years and older who were free of type 1 and 2 diabetes mellitus at baseline. Of all participants, 4,741 developed type 2 diabetes mellitus over 5 years. We conducted the statistical analyses in RStudio using the programming language R. The area under the receiver operating characteristic curve (AUC) of the original model was 0.726 (95% confidence interval: 0.719, 0.733). After adjusting the calibration intercept and slope, the original model performed reasonably well in the external cohort. The best performance was measured by using the numerical predictors as continuous variables and refitting all coefficients (AUC: 0.741, 95% confidence interval: 0.734, 0.748). The results of the original model after calibration were comparable to those received from the AUSDRISK score which is routinely used in Australian clinical practice. Hence, the lifestyle-based model might be a reasonable alternative for laypersons since the required information is most likely known by these. Further, the risk score may communicate the message about the importance of a healthy diet to reduce the risk of diabetes.

SUBMITTER: Buss VH

PROVIDER: S-EPMC8684002 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:Preclinical models of type 1 diabetes mellitus exhibit marked declines in skeletal muscle health including significant impairments in muscle repair. The present study investigated, for the first time, whether muscle repair was altered in young adults with uncomplicated type 1 diabetes (T1D) following damaging exercise.In this cohort study, eighteen physically-active young adults (M=22.1, SEM=0.9 years) with T1D (n, male/female=4/5; MHbA1c= 58, SEMHbA1c=5.9 mmol/mol) and without T1D (n, male/female=4/5) performed 300 unilateral eccentric contractions (90°s-1) of the knee extensors. Prior to exercise, at 48-hours and at 96-hours after exercise, participants gave a venous blood sample and vastus lateralis biopsy and performed a maximal voluntary isometric knee extension. Skeletal muscle extracellular matrix content, and satellite cell content/proliferation were assessed by immunofluorescence. Transmission electron microscopy was used to quantify ultrastructural damage.Maximal isometric strength was comparable between T1D and their sex-matched control group prior to exercise for both sexes. Immediately following damaging exercise, strength was decreased in both groups but there was a moderate effect size for lower strength during recovery in the T1D group at both 48-hours and 96-hours. Serum creatine kinase, an indicator of muscle damage, was moderately higher in T1D participants compared to controls at rest, and exhibited a small elevation 96-hours after exercise. Immunofluorescence analyses showed satellite cell content was lower at all timepoints in those with type 1 diabetes. T1D participants demonstrated a moderate delay in satellite cell proliferation (as assessed by Pax7+/Ki67+ nuclei counts) after exercise, reaching peak levels of proliferation 48-hours after control participants. Despite these differences, those with T1D did not exhibit greater ultrastructural muscle damage than controls as assessed by electron microscopy. Finally, a transcriptomic investigation of T1D muscle revealed several networks of dysregulated genes involving RNA translation as well as mitochondrial respiration function, providing potential explanations for previous observations of mitochondrial dysfunction in similar T1D cohorts. Our novel findings indicate that skeletal muscle from physically active, young adults with moderately controlled T1D may have a reduced ability to handle, and repair from, damaging exercise. While larger cohort studies are clearly needed, these results suggest that those with T1D may require longer recovery times following damaging exercise.

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Validation of a lifestyle-based risk score for type 2 diabetes mellitus in Australian adults.

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