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.text: physical exercise
entities.type: intervention
entities.text: regular physical exercise
entities.type: intervention
entities.text: biochemical risk factors for ischaemic heart disease
entities.type: outcome
entities.text: 31 healthy middle aged men
entities.type: participant