The relationship between dietary pattern and physical activity combinations to physical performance in 85+ Japanese population: A cross-sectional study from the TOOTH study

Background

Physical performance is a major contributor to frailty and sarcopenia. Healthier behaviour (diet and physical activity (PA)) are important, but the applicability of the evidence should be carefully discussed in the general older population and the population aged 85 years and older (85+ population). Evidence in the 85+ population is rare and there are no studies focusing on the healthier behaviours.

Methods

Data (n = 519) from the Tokyo Oldest Old survey on Total Health study were used. From each validated questionnaire in this age group, the dietary patterns (DPs) was identified, and the PA was estimated. Physical performance tests included grip strength, timed up-and-go test, and chair standing, which are important for assessing frailty or sarcopenia. Linear regression models were used to examine the relationship between the combination of DP and PA to physical performance.

Results

DPs identified `Various plant foods' (DP1), `Fish and mushrooms' (DP2), and `Cooked rice and miso soup' (DP3) were identified. The median PAI was 9.0 METs × h/week. Based on the characteristics of the combination of DP and PA with unhealthy behaviour as the reference group, all combinations were significantly associated with all physical performance tests if both achieved. However, it was observed that some combinations were not significantly associated with DP or PA alone.

Conclusions

Healthy behaviours (both diet and PA) are important for physical performance in the 85+ population. The association of PA in the 85+ population may vary depending on the dietary status of the individual.