Sentence:  That same year the University of California 's Dr. Laurance Kinsell , <WSD>timing</WSD> oxidation rates of blood fats , stumbled onto the discovery that many vegetable fats cause blood cholesterol levels to drop radically , while animal fats cause them to rise . 
Meaning of the word marked with <WSD> tags:  measure the time or duration of an event or action or the person who performs an action in a certain period of time