This study evaluates the mass concentration and chemical composition of particulate matter (PM), collected in the chamber complex of the underground health resort located in the Wieliczka Salt Mine in southern Poland. Physical and chemical properties of PM were examined from the standpoint of their possible connection with therapeutic effects of the subterranean air in the mine. We found that in three underground spots we measured the average concentration of PM did not exceed 30 μg/m. Chemical composition of PM was dominated by sodium chloride, making up 88 % of its mass, on average. It was shown that the underground ambient concentration of PM and its chemical composition depended mostly on the nature of the rock material present in the ventilation tunnel of the health resort, filtering the incoming air. The presence and effect of external sources of PM, including patients' activity, also had an impact on the underground PM concentration.

The 'Wieliczka' Salt Mine with specific stable, microclimatic conditions is a unique place, where pulmonary and allergy-related diseases are treated. The aim of this study was to determine the occurrence of biological particles in the air of the 'Wieliczka' Salt Mine in relation to the location and time. Twenty measurements were taken quarterly in 2012-2016, in four salt chambers. The volumetric and impact methods were used to measure microbiological contamination, while the mite and cat allergens were measured using FEIA assay. The statistically significant differences among the study sites and time of measurements, treated as the following seasons, for spores and bacteria were found. Pollen grains were observed in the underground chambers rarely and in significantly lower quantities than outdoors. No statistically significant differences between the content of Der p1 and Fel d1 allergens among the study locations, seasons and patient presence/absence were found. The qualitative content of microorganisms in the air of salt chambers seems to be related to the biological material carrying in by patients and staff. Keywords Underground air quality Á Allergen free zone Á Fungal spores Á Bacteria Á Impact and volumetric methods Á Subterraneotherapy Á Speleotherapy

Objective: Our aim was to determine the influence of pulmonary rehabilitation conducted in therapeutic salt mine chambers on the functional fitness of older adults. Methods: The study included 22 individuals of age >65 years with chronic respiratory conditions. The patients underwent the Fullerton test before and after a 3-week outpatient pulmonary rehabilitation in the “Wieliczka” Salt Mine Health Resort. Results: After the rehabilitation stay, the results showed statistically significant improvements within five of the six parameters evaluated. In the Arm Curl, the mean number of repetitions within 30 s increased from 14.55 ± 3.63 to 16.68 ± 3.83 and in the Chair Stand from 11.86 ± 2.55 to 14.41 ± 2.95. Beneficial changes were observed in the Back Scratch, but without statistical significance. In Sit and Reach results increased from -2.3 ± 11.11cm to 2.14 ± 9.19 cm. Time for performing the 8-Foot Up and Go decreased from 6.63 ± 1.27 s to 5.8 ± 0.86 s and in 2-Minute Step results increased from 88.27 ± 20.64 to 96.55 ± 16.38 repetitions. Conclusion: Functional fitness of examined older adults with pulmonary disorders has increased after a rehabilitation and treatment stay in underground salt mine chambers. The reviews of this paper are available via the supplemental material section.

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This study aimed to evaluate the mass concentration of size-resolved (PM1, PM2.5, PM4, PM10, PM100) particulate matter (PM) in the Wieliczka Salt Mine located in southern Poland, compare them with the concentrations of the same PM fractions in the atmospheric air, and estimate the dose of dry salt aerosol inhaled by the mine visitors. Measurements were conducted for 2 hours a day, simultaneously inside (tourist route, passage to the health resort, health resort) and outside the mine (duty-room), for three days in the summer of 2017 using DustTrak DRX devices (optical method). The highest average PM concentrations were recorded on the tourist route (54–81 µg/m3), while the lowest was in the passage to the health resort (49–62 µg/m3). At the same time, the mean outdoor PM concentrations were 14–20 µg/m3. Fine particles constituting the majority of PM mass (68–80%) in the mine originated from internal sources, while the presence of coarse particles was associated with tourist traffic. High PM deposition factors in the respiratory tract of children and adults estimated for particular mine chambers (0.58–0.70), the predominance of respirable particles in PM mass, and the high content of NaCl in PM composition indicate high health benefits for mine visitors.

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The place of residence (in or out of the industrial area) and exacerbations of chronic laryngitis are highly correlated. Air pollution seems to be the main factor influencing on the condition of upper respiratory tract. In our local conditions of Lesser Poland Voivodeship subterraneotherapy may be an interesting, non-invasive method preventing from exacerbations of upper respiratory tract diseases.

Backgrounds: As people age, they are more likely to experience balance disturbances. Pulmonary rehabilitation is recognized as a core component in the management of older adults with chronic respiratory diseases. The aim of the study was to assess the dynamic balance and chest mobility of older adults participating in speleotherapy combined with pulmonary rehabilitation, endurance and strength training. Methods: The study group consisted of 51 older adults with chronic respiratory disorders who participated in a 3-week pulmonary rehabilitation programme in underground salt chambers in the ‘Wieliczka’ Salt Mine Health Resort. These individuals underwent the Four Square Step Test (FSST) and circumferential chest mobility measurement before and after the outpatient rehabilitation programme conducted 135 m underground. Results: Before rehabilitation in the underground salt chambers, half of the results (50%, 22 patients) were below the norm in the assessment of chest mobility between maximal inhale and exhale. The average time needed to perform FSST decreased significantly (p ≤ 0.05) from 10.2 ± 1.9 s before the stay to 9.1 ± 1.7 s after the stay and the average increase in chest mobility increased significantly (p ≤ 0.05) from 4.5 ± 5.5 cm to 5.4 ± 2.8 cm. Conclusions: Speleotherapy combined with pulmonary rehabilitation, endurance and strength training increased the dynamic balance and chest mobility of older adults with chronic respiratory diseases, as measured by the FSST and circumferential chest expansion assessment.