Early Intervention With a Low-intensity Leg Cycling Exercise Program for Individuals After Stroke

This is a two-stage study. In the first stage, 30 subjects with stroke (onset \> 2 weeks) are recruited, and they are assessed and recorded with clinical characteristics, sympathetic nerve testing, and twice symptom-limit exercise capacity tests. The second stage would recruited 90 subjects with stroke (onset\>2 weeks), and they are randomized to one of three groups (control, low-intensity, high-intensity). They are evaluated before and after the four-week interval with clinical characteristics and twice symptom-limit exercise capacity tests (baseline and after four-week training) .