Abstract
Background
Anemia is the most common hematological abnormality among older adults, and it is associated with decreased physical performance. But the role of hemoglobin in the absence of anemia remains unclear. Thus, this study aimed to assess the impact of hemoglobin levels on physical performance in Brazilian older adults without anemia.
Methods
The study is longitudinal in that it relies on two waves of the Saúde, Bem-Estar e Envelhecimento (SABE; Health, Well-being, and Aging) study: 2010 and 2015–2016. Mixed-effects linear regression was used to determine the effects of the hemoglobin concentrations on the Short Physical Performance Battery-SPPB over time among the 1,020 who had complete data and did not have anemia in 2010. In the follow-up, there were 562 without anemia. Analyses were stratified by sex.
Results
In analyses adjusted for age, education, grip strength, comorbidities, and body mass index, hemoglobin levels were positively associated with physical performance scores among older women (β = 0.15, p < 0.05) and men (β = 0.18, p < 0.05) without anemia.
Conclusion
Our study demonstrates that higher hemoglobin levels were associated with better physical performance among older men and women without anemia. This finding is important because, in clinical practice, most health professionals focus on the World Health Organization definition of anemia. Our study suggests the importance of hemoglobin levels among older adults, even those without anemia.