TASK DEFINITION: In medical studies, the efficacy of medical treatments (called interventions) is evaluated within a group of study participants. You will be given a sentence of a study report in which your task is to list the phrases that describe the intervention(s) of the study. You should list the phrase in the same order that they appear in the text, separated by commas. If no information about the interventions is mentioned, just answer with "not found". Interventions are: a specific drug, surgery, talking therapy, a lifestyle modification, control or placebo treatment. Do not include details, dosages, frequency and duration, intervention mentions that are not in an informative span of text.
PROBLEM: Influence of diets rich in Maillard reaction products on calcium bioavailability .

SOLUTION: Maillard reaction

PROBLEM: In contrast , the number of wet nights and urodynamic parameters did not change significantly in group 2 .

SOLUTION: not found

PROBLEM: To study the effects of physical exercise on biochemical risk factors for ischaemic heart disease 31 healthy middle aged men undertook regular physical exercise for two months and 29 served as controls in a randomised trial .

SOLUTION:
physical exercise