We observed peripheral circulation in patients suffering from peripheral neuropathy in order to quantify the effect of spa therapy on peripheral neuropathy.
The peripheral circulation was observed using thermography and Laser-Doppler blood flowmetry. Thirteen patients with a mean age of 71.9 years (range of 59-82) suffering from diabetic neuropathy with coldness, numbness, neuralgia in their feet or walk disturbance, and 11 patients with a mean age of 72.3 years (range of 60-84) suffering from lumbago, were examined by the methods. The blood flow, mass and velocity were measured by a Laser-Doppler blood flowmetry, after pre-loading with hot water at 36°C for 5min (hot loading), and after cold loading with cold water at 20°C for 5min. Thermographic results were analyzed quantitatively by calculating a recovery ratio as: Recovery ratio=[Total counts of thermography (Pixels) over 27°C after cold loading] ÷ [Initial counts over 27°C after hot loading]×100 (%).
The recovery ratio in diabetes mellitus was between 0-93.5% (mean=46.8%), whereas the recovery ratio in lumbago was between 0-91.3% (mean=41.3%). The blood flow in patients with diabetes mellitus was 1.11-5.36 (ml/min/100g tissue), (mean=2.44), the blood mass was 85-255 (mean=155), and the velocity was 0.447-0.784 (mean=0.591). The blood flow in patients with lumbago was 1.18-3.82, (mean=2.19), the blood mass was 89-195 (mean=144), and the velocity was 0.464-0.8 (mean=0.615). The recovery ratio and blood flow in patients with diabetes mellitus were correlated, r=0.62 and p<0.0002, as the recovery ratio and blood mass were correlated, r=0.59 and p<0.0001. However the blood flow and the velocity in these patients were not correlated, r=0.11. The recovery ratio and blood flow in patients with lumbago were not correlated, r=0.02, but the recovery ratio and blood mass showed some correlation, r=0.38. The recovery ratio and the velocity in these patients were correlated, r=0.64 and p<0.005. The blood flow in patients with diabetes mellitus was greater after hot loading (mean=2.89) than after cold loading (mean=2.44). The blood mass in patients with diabetes mellitus was greater after hot loading (mean=180) than after cold loading (mean=155). However, there was no significant change in the velocity after hot loading (mean=0.572) compared with the velocity after cold loading (mean=0.591).
It was revealed that patients with diabetes mellitus with low recovery ratios in thermography had low blood flow and blood mass in their peripheral circulation. Patients suffering from lumbago had different peripheral circulation compared with diabetes mellitus. Spa therapy was effective on diabetic peripheral neuropathy as the peripheral circulation improved with hot water at 36°C

Effects of spa therapy on asthma were studied in 64 patients with asthma in relation to the generation of leukotrienes B4 (LTB4) and C4 (LTC4) and bronchial hyperresponsiveness. 1. The efficacy of spa therapy was marked in 12 (18.8%), and moderate in 45 (70.3%) of 64 patients with asthma, and slight or no efficacy of the therapy was observed in the residual 7 patients (10.9%). 2. Bronchial hyperresponsiveness to methacholine was the highest in patients with slight or no efficacy of spa therapy, however, there were no significant differences among the three groups classified by clinical efficacy. 3. The generation of LTC4 by leucocytes was significantly higher in patients with slight or no efficacy compared with the generation in those with marked (p<0.01) and moderate efficacy (p<0.001). However, there were no significant differences in the generation of LTB4 among them. 4. The generation of LTC4 before spa therapy significantly decreased in patients with marked (p<0.001) and moderate efficacy (p<0.01) after spa therapy, but not in those with slight or no efficacy. The generation of LTB4 was not significantly different before and after spa therapy among patients with marked, moderate, and slight or no efficacy. These results show that the efficacy of spa therapy for patients with asthma is closely related to the generation of LTC4 by leucocytes, and that the generation of LTC4 significantly decreases after spa therapy in patients with spa efficacy.

Characteristics of low attenuation area (LAA) of the lungs on HRCT were studied in 132 patients with asthma, and long-term spa therapy on the LAA of the lungs was observed in 5 patients with asthma, whose me an %LAA was more than 30%.
1. The morphology of LAA of the lungs on HRCT observed in asthma was different from that in pulmonary emphysema. 2. The LAA of the lungs in asthma was closely related to residual volume (RV). 3. The mean %LAA value significantly decreased from 33.5% before spa therapy to 24.5% at 24 months after beginning of the therapy. CT number also significantly increased after long-term spa therapy. 4. %FEV1.0 value significantly improved from 52.1% before spa therapy to 72.1% at 24 months after spa therapy. The RV value also decreased by spa therapy, however, the decrease was not significant. These results suggest that LAA of the lungs in asthma is associated with hyperinflation, and the LAA of the lungs decreases after long-term spa therapy.

Clinical effects of spa therapy for patients with pulmonary emphysema (PE) were evaluated by observing changes in %LAA of the lung on HRCT, %RV, %FVC, %FEV 1.0, and %DLco values after the long-term therapy. The subjects in this study 16 patients with PE. The subjects were divided into two groups according to the extent of %LAA<-950 HU of the lung on HRCT: %LAA<50% (N=6) and 50%≤%LAA (N=8). 1. Spa therapy significantly improved %LAA (42.5% at the initial stage to 36.3% 24 months after spa therapy), %RV (202.1% to 156.1%) and %DLco 71.0% to 85.7%), but not %FVC and %FEV 1.0, in patients with PE of %LAA<50%, however, significant. Improvement of these parameters was not observed in patients without spa therapy. 2. Spa therapy did not improve the values of %LAA, %RV, and %DLco, as well as %FVC and %FEV 1.0, in patients with PE of 50%≤%LAA. These parameters tended to decrease in the patients of 50%≤%LAA. These results suggest that spa therapy improves %LAA and parameters related to pulmonary function when they are at early stage of PE, however, the therapy was not remarkably effective for these parameters when they were at advanced stage of PE.