You will be shown an abstract from a biomedical research paper. Given this abstract, your task is to extract all unique entities of the following types: ["Outcome", "Participant", "Intervention"].

Please return the output as a JSON object of the format: {"Participant" : ["patients with COPD", ...], "Intervention" : ["Atenolol", ...], "Outcome" : ["blood pressure", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Abstract:

Moderate-intensity exercise training with elements of step aerobics in patients with severe chronic heart failure . OBJECTIVE To evaluate whether a specific program of moderate-intensity step aerobics training may be sufficient to improve the exercise tolerance of patients with severe chronic heart failure . PATIENTS Twenty-six patients ( 22 men , 4 women ; mean +/- SD age , 54 +/- 9yrs ) with a history of severe chronic heart failure ( left ventricular ejection fraction of 18 % +/- 8 % ) . STUDY DESIGN Prospective , randomized , controlled trial . Patients were randomized into exercise and control groups . All patients underwent a clinical examination and a ramp pattern cycle exercise test before and after the observation period . The exercise group underwent a moderate-intensity ( 50 % of peak oxygen uptake ) 12-week training program , progressing to 100 minutes per week of step aerobics and 50 minutes per week of cycling . The control group did not perform a training program . MAIN OUTCOME MEASURES Peak oxygen uptake , peak workload , percent of predicted power ability . RESULTS Significant increases in peak oxygen uptake ( 15 +/- 3.4 to 18.5 +/- 2.9mL/kg/min ; p = .001 ) , peak workload ( 77 +/- 26 to 99 +/- 31 watts ; p = .000 ) , and percent of predicted power ability ( 43 % +/- 10 % to 56 % +/- 13 % ; p = .000 ) were observed in the exercise group . No significant changes in baseline parameters occurred in the control group . There were no critical changes in heart rate or blood pressure in either group . CONCLUSION Moderate-intensity step aerobics training significantly increases peak oxygen uptake and peak workloads in patients with severe chronic heart failure .
{"Intervention": ["moderate-intensity step aerobics training", "moderate-intensity ( 50 % of peak oxygen uptake ) 12-week training program", "progressing to 100 minutes per week of step aerobics and 50 minutes per week of cycling", "Moderate-intensity exercise training", "perform a training program"], "Outcome": ["blood pressure", "percent of predicted power ability", "peak workload", "heart rate", "peak oxygen uptake", "Peak oxygen uptake", "peak workloads"], "Participant": ["patients with severe chronic heart failure ."]}