Abstract
Introduction 
 
 Understanding the physiological effects of immersion, particularly on pulmonary dynamics in healthy individuals is important to predict and interpret the physiological responds in unhealthy group. The aim of our study is to evaluate the inspiratory and expiratory muscle strength and cough strength in healthy individuals during water immersion at different water depths. 
 
 Methods
 A cross-sectional study was conducted in 24 healthy individuals with the mean age 20.0 years. Respiratory muscle strength test and cough force were tested on dry land and in pool at iliac crests, xiphoid appendix of the sternum and clavicles levels. Measurements were randomized at each level. The Friedman test was used for repeated measures with Wilcoxon signed ranks test with Bonferroni correction was applies to compare the variables. 
 Results
 A significant difference between dry land and immersion in water of different levels for MEP (p=0.001) and PEF (p= 0.015). multiple comparisons showed no difference between levels in PEF (p
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