This is a substudy of the Generation-100 study (NCT01666340). Self reported physical activity versus objectively measured physical activity and its correlation to maximal oxygen uptake in an elderly Norwegian population (observational study).

Data is collected using activity monitors. This data then compared to self reported physical activity obtained through questionnaires. Questionnaires are based on recall. Overall physical activity will then be correlated to maximal oxygen uptake to see whether people with high activity also have high maximal oxygen uptake.

Inclusion Criteria:

• ability to walk at least 1km,
• born in 1938,1939,1940,1941 or 1942
• Sufficiently good health to be able to take part in the study, as determined by the researchers

Exclusion Criteria:

• Illness or disability that precludes exercise or hinders completion of the study
• Uncontrolled hypertension
• Symptomatic valve disease, hyper tropic cardio-myopathy or unstable angina
• Active cancer
• Test results indicating that study participation is unsafe
• Inclusion in other studies conflicting with participation in this one

Norwegian elderly population 70-77 years of age