Objective
Grip strength predicts functional decline and death, and is regarded as a biomarker of biological aging. The primary objective of this manuscript was to assess differences in the rate of decline in grip strength in persons aging with and without HIV.
Design
Grip strength was assessed in 1,552 (716 HIV+ and 836 HIV−) men ≥ 50 years participating in the Multicenter AIDS Cohort Study between 2007 and 2014.
Methods
Grip strength decline was modeled longitudinally, adjusting for serostatus, demographics, comorbidities, and conditions. In HIV-specific models, coefficients were included for cumulative viral load and history of AIDS.
Results
Grip strength at age 50 averaged 37.9 kg and 38.2 kg for HIV+ and HIV− men, respectively (p = 0.70). In fully adjusted models, grip strength declined 0.33 kg/yr in HIV− men (p <0.001) and 0.42 kg/yr in HIV+ men (p = 0.01). In HIV-stratified models, higher cumulative viral load indicated greater strength decline (−0.884 kg for 3.1 – 4.0 log10 copies-years/mL and −1.077 kg for ≥ 4.1 log10 copies-years/mL) relative to men with consistently low viral load (≤ 3.0 log10 copies-years/mL). Adjusted Cox proportional hazard models revealed a 70% greater risk of clinically weak grip strength in HIV+ men (aHR 1.70; 95% CI, 1.22 – 2.40).
Conclusions
Grip strength decline is accelerated in HIV-infected men, which may contribute to decreased life expectancy and lower quality of life with aging. Greater cumulative viral load exposure appears to be an important driver of this decline and underscores the importance of early initiation of therapy.