Major Factor of the Deterioration of Physical Fitness in Poststroke Hemiplegics
1990 Volume 27 Issue 1 Pages 53-57
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1990 Volume 27 Issue 1 Pages 53-57
We reported in 1985 on the deterioration of physical fitness in poststroke hemiplegics in the 5th and 6th decade. Physical fitness was measured by the oxygen up take at the heart rate of 100 or 120 beats/min. [(VO2)100, (VO2)120]. The purpose of the present study is to clarify the major factor of the deterioration of (VO2)100 in poststroke hemiplegics. (VO2)100 consists of heart rate (100 beats/min.), stroke volume and arterial-mixed venous oxygen difference at the heart rate of 100 beats/min.. In this study, (VO2)100 and stroke volume ((SV)100) were measured during exercise at the heart rate of 100 beats/min., and arterial-mixed venous oxygen difference was calculated from these data. Subjects were 10 male hemiplegics due to stroke and 8 normal men in the 5th to 7th decade. The mean age in hemiplegics was 54.0 years, and that of the normal men was 54.9. All the hemiplegic patients could walk independently within the hospital. The exercise at the heart rate of 100 beats/min. was performed with Cybex II in sitting position with the repeated full flexion and extention of the uninvolved lower extremity in hemiplegics, and with the right side leg in normal control. The exercise was performed for 4min.. During the last 1min., the expired gas was collected by the Douglas bag and (SV)100 was measured by the dyedilution technique. (VO2)100 was 9.5ml/kg·min in hemiplegics, and 12.7ml/kg·min in normal men (p<0.05), (SV)100 was 49.3ml/beat/m2 in hemiplegics, and 62.6ml/beat/m2 in normal men (p<0.01). Difference between two groups in arterial-mixed venous oxygen difference was not statistically significant. From these results, we concluded that major factor of deterioration of (VO2)100 in poststroke hemiplegics is the decrease in (SV)100.
