Answer to Question 1
A meta-analytic study of exercise interventions in advanced-age participants without clinical disorders found that the effect size for psychological well-being was three times greater than for control groups; aerobic exercise was the type and moderate intensity activity was the activity level that were the most beneficial. The study's authors noted that physical activity had a significant effect on self-efficacy and that well-being was linked to indicators of cardiovascular fitness.
Answer to Question 2
Although there are some mixed findings, when examining the studies with better methodology, it appears that it does. For example, using a large scale community sample from the Alameda County Study, epidemiologists were able to determine that physical activity was protective against developing later depression both through cross-sectional and longitudinal analysis even after controlling for potentially confounding variables.
Evaluation measures to determine the success of goals
Research Methods
How to find two positive angles less than 360° that have a tangent of −2.25
Drug Effects
Dental Related Adverse Effects in Patients Undergoing Cancer Treatment
Sleep Studies