The phrase "activity and level of" is correct and usable in written English.
It can be used when discussing the intensity or extent of a particular activity or behavior in various contexts, such as health, fitness, or research.
Example: "The study measured the activity and level of physical exercise among participants to determine its impact on overall health."
Alternatives: "extent and intensity of" or "degree and frequency of".
As you might expect, it depends on both the activity and level of effort.
Talamonti, M. S., Roh, M. S., Curley, S. A. & Gallick, G. E. Increase in activity and level of pp60c-src in progressive stages of human colorectal cancer.
"There has been an increase in activity and level of damage in which violence is being used to intimidate and coerce people," said LaRae Quy, an F.B.I. spokeswoman in San Francisco.
These differences could be due to differences in the type, quality, or intensity of volunteering experiences, including differences in the number of hours, volunteering activity, and level of engagement among the adult-required volunteers and self-volunteers.
Although the PASC degradation activity and level of cellulase gene transcription of the cellulase/cellodextrin transporter-co-expressing strain was very similar to that of the strain expressing cellulase only (Figures 2 and 3), it produced more ethanol from PASC than did the strain expressing only cellulase (Figure 4).
Activity and level of Cdk5 were significantly elevated after spinal ischemia-reperfusion injury.
A separate group of squirrel monkeys (n=14) was used for quantification of FAAH activity and levels of fatty acid ethanolamides (FAEs) in the brain and liver.
In the first, 60 students, ages 14 to 17, were assessed for baseline cardiovascular activity and levels of cortisol, a stress hormone.
To assess the effect of varicocelectomy on sperm function (DNA integrity and mitochondrial activity) and levels of lipid peroxidation in seminal plasma of adolescents.
Similarly, intracisternal administration of 6-hydroxydopamine produced tissue-selective alterations in ornithine decarboxylase activity and levels of the polyamines.
