The phrase "activity had changed" is correct and usable in written English.
It can be used to indicate that a particular activity has undergone a transformation or alteration over time.
Example: "After reviewing the data, it was clear that the activity had changed significantly since last year."
Alternatives: "the activity shifted" or "the activity evolved."
They said it was too soon to say climate change caused by human activity had changed the flow.
The study participants had to give a similar speech at the end of the treatment period, so researchers could assess whether their patterns of brain activity had changed.
Where physical activity had changed by less than two MET hours per day in either direction, this was coded as 'no change' and used as the reference group.
Once the surveillance signal occurred, we allocated the provisional diagnoses of visits admitted to critical care into our diagnosis-based syndromes and assessed how their relative contribution to recent activity had changed.
For example, when it was revealed that control of glycaemic and other variables had worsened, that dietary intake, including quantity and content, and alcohol intake had changed, that patterns of physical activity had changed or that patients tended to forget to take their medicine, possible strategies for improving lifestyle and habits were discussed.
Naysayers aside, the world appears to have nudged its way towards the view that there is a scientific consensus that human activity has changed our climate.
Human activity has changed Earth irreversibly to form the present biosphere, and humans are now a force for further irreversible change.
When we look at how physical activity has changed over the past 50 years, there has been a global decrease in physical activity and an increase in sedentary behaviour (time spent sitting).
Like the reassuring but unsettling sight of armed members of the National Guard patrolling Newark International Airport and Pennsylvania Station, the closed roads serve are yet another reminder of how heightened military activity has changed New Jersey.
