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| Human coronary collateral recruitment is facilitated by isometric exercise during acute coronary occlusion |
| Lin S, Lu X, Chen S, Ye F, Zhang J, Ma Y, Li J |
| Journal of Rehabilitation Medicine 2012 Aug;44(8):691-695 |
| clinical trial |
| 5/10 [Eligibility criteria: No; Random allocation: Yes; Concealed allocation: No; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: Yes; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed* |
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OBJECTIVE: To determine whether isometric exercise increases collateral flow in remote ischaemic myocardium in acute coronary occlusion models of patients with coronary artery disease. DESIGN: A randomized controlled study. SUBJECTS: Sixty-five patients with 1-vessel coronary artery disease. METHODS: Subjects were randomly assigned to either the isometric exercise group or non-exercise group. Patients in the exercise group performed isometric handgrip exercises (50% maximal voluntary contraction) during 1 min coronary balloon occlusion, while patients in the non-exercise group remained sedentary. The collateral flow index, heart rate, systolic blood pressure and diastolic blood pressure were determined prior to and following 1 min of coronary occlusion. RESULTS: In the exercise group, difference values for collateral flow index (after coronary occlusion before coronary occlusion) were significantly higher than those in the non-exercise group (0.04 standard deviation (SD) 0.05 versus 0.01 (SD 0.03), p < 0.01). Differences in heart rate, systolic blood pressure and diastolic blood pressure were also significantly higher than controls (heart rate 7.84 (SD 8.20) versus 0.88 (SD 3.96), p < 0.01; systolic blood pressure: 3.25 (SD 7.17) versus 1.88 (SD 6.21), p < 0.01; diastolic blood pressure 5.88 (SD 6.40) versus 1.5 (SD 6.22), p < 0.01). CONCLUSION: Isometric exercise in patients with coronary artery disease induced an increase in coronary collateral flow during acute vessel occlusion, which was significantly different from control occlusion.
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