Health-related quality of life (HRQoL)
A measure of how a health condition and its treatment affect a person's physical, mental and social wellbeing.
Health related quality of life is a measure of how a condition and its treatment affect physical function, mental wellbeing and social participation. It captures how someone is actually living rather than what their test results say.
It matters because clinical endpoints and human experience can diverge. A treatment can improve a scan, a blood marker or even survival while making daily life worse, and one that shortens nothing and lets someone climb stairs again may matter more to them than either.
It is measured with validated questionnaires rather than by asking a vague question. Generic instruments such as the SF-36 and EQ-5D allow comparison across conditions; disease specific instruments capture the details that matter within one condition.
Those measures feed directly into how healthcare decisions are made. Quality adjusted life years, which combine length of life with quality of life, underpin the cost effectiveness assessments that bodies such as NICE use to decide what is funded.
For fitness and lifestyle research it is often the most honest endpoint available. Exercise interventions in older adults frequently show modest changes in physiology alongside meaningful improvements in function and independence, and reporting only the first understates the result.
It also connects directly to the healthspan idea: extending years of life without extending years of good function is not obviously a benefit, and quality of life measures are how that distinction gets quantified.
In practice, when reading a study, check whether anyone asked the participants how they were doing. Where a lifestyle intervention improves both markers and quality of life, that is a stronger result than either alone.