passages.id: 1509
passages.type: sentence
passages.text: 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 .
entities.id: 1510
entities.type: intervention
entities.text: physical exercise
entities.id: 1511
entities.type: intervention
entities.text: regular physical exercise
entities.id: 1512
entities.type: outcome
entities.text: biochemical risk factors for ischaemic heart disease
entities.id: 1513
entities.type: participant
entities.text: 31 healthy middle aged men