Gait Speed and Evolution of Verbal Fluencies in Frail or Prefrail Older People with Type 2 Diabetes. A Pilot Study.

OBJECTIVES: Type 2 diabetes (T2D) is a risk factor of frailty and cognitive impairment. Impaired gait in older people is associated with incident vascular dementia. We aimed to assess whether in frail or prefrail older subjects with T2D, lower gait speed can be associated with faster cognitive decline. DESIGN: Case-control study nested in a large randomized control trial (RCT, MID-frail); post hoc analysis. SETTING AND PARTICIPANTS: Older frail and prefrail subjects (>70y) with T2D and with no history of cognitive problems were enrolled in a single recruiting center. Participants were divided into two groups depending on their walking speed - above (fast walkers) or below (slow walkers) using a cut off of 1 m/sec. MEASURE: Cognitive function was assessed at baseline and during follow-up with the MMSE, category and letter fluencies at 15 sec (initiation) and 15-60 sec (late). RESULTS: 48 subjects were included, 22 were fast walkers, 26 were slow walkers. The mean follow-up was 60.9 (SD 17.5) weeks. The baseline 0-15 sec letter fluency was higher in fast walkers (p=0.008). There was no difference at baseline with MMSE scores and category fluency. The MID-Frail intervention did not change the evolution of any cognitive changes. Comparisons were adjusted for age, sex and baseline performance, and showed a steeper decline of category fluency score in slow walkers (fast walkers +0.04 (-1.49 to1.56) compared with -0.89 (-2.15 to 0.38), p=0.049) with a moderate effect size. CONCLUSION: In frail or prefrail older adults with diabetes, we observed a decline in category fluency in those with low gait speed.

The Use of Posturography in Investigating the Risk of Falling in Frail or Prefrail Older People with Diabetes.

BACKGROUND: In older people, diabetes is associated with an increased risk of falls and frailty. The value of using posturography for evaluating the risk of falling is unclear. In theory, a time-scale analysis should increase the metrological properties of the posturography assessment. OBJECTIVES: This study aimed to determine which posturographic parameters can be used to identify fall-risk patients in a frail diabetic older population and to assess their interest in comparison to usual clinical trials for gait and balance. DESIGN: This is a prospective observational cohort. SETTINGS: frail or pre-frail diabetic patients, in Bordeaux, France. PARTICIPANTS: 84 patients were included in the study (mean age 80.09 years, 64.5% of men).Criteria for inclusion were: age over 70 years, diabetes mellitus for over 2 years, and at least one of the Fried's frailty criteria. MEASUREMENTS: Gait and balance assessments were undertaken at baseline: Static posturography, the timed up and go test, short physical performance battery, and (gait) walking speed. Raw data from posturography were used for wavelet analysis. Data on self reported new falls were collected prospectively during 6 months. RESULTS: The posturography parameter most useful was area of 90% confidence ellipse of statokinesigram (COP90area): area under the ROC curve AUC = 0.617 (95% CI, 0.445-0.789) and OR=1.003 (95%CI 1.000-1.005) p =0.05. The optimum clinical test was the time to walk over 4m AUC=0.735 (95%CI, 0.587-0.882) and OR=1.42 (95%CI 1.08-1.87) p= 0.013. CONCLUSION: Posturography has limited utility for assessment of falls risk in frail older people with diabetes. Gait and balance clinical assessments such as walking speed continue to retain their value.