Abstract
Assessment of Air Way Resistance Indexes and Exercise-Induced Asthma after a Single Session of Submaximal Incremental Aerobic Exercise The present study aimed at assessing air way resistance indexes that include FEV1 (Force expiration Volume in one second), FVC (Forced vital capacity) and FEV1/FVC and exercise-induced asthma (EIA) after one session of sub maximal incremental aerobic exercise. Fifty healthy male subjects (age 19-26) from the faculty of Physical Education, University of Shahid Chamran served as the participants of the study. They were randomly assigned to either exercise or control groups. Body height, body mass and pulmonary factors were measured in the pre-test conditions. The study protocol included a sub maximal incremental Astrand - Rhyming test on an ergocycle. After performing this test by the exercise group, FEV1, FVC and FEV1/FVC, were measured again for both groups and compared with pre test evaluations. The data were analyzed through descriptive and inferential statistics (dependent and independent t test). Results showed that there was a significant difference in FEV1 between the two groups after the exercise protocol (p ≤ 0.05). There was no significant difference in FVC between the two groups after exercise, and a significant difference was registered in FEV1 and FEV1/FVC between pre-test and post-test results in the group that performed the aerobic test protocol (p ≤ 0.05). Our results indicate that one sub maximal incremental aerobic exercise session causes a significant change in FEV1 and FEV1/FVC, and causes exercise-induced asthma.
Highlights
Diurnal variations may lead to changes in athlete’s performance through changing blood, metabolic and pulmonary responses at rest and during exercise
Absolute values of FEV1 and FEV1/FVC decreased after the test in the exercise group, but there was not significant different in FVC after the test protocol (Table 3, Fig.1)
Significant differences in FEV1 and FEV1/FVC were observed between the two groups after the test (Fig. 2, Table 4)
Summary
Diurnal variations may lead to changes in athlete’s performance through changing blood, metabolic and pulmonary responses at rest and during exercise. Pulmonary ventilation has a linear relationship with oxygen uptake at different levels of exercise. According to Fatemi (2009), pulmonary function parameters have close interactions with maximum oxygen uptake (VO2max), and subjects with higher. The effect of exercise on pulmonary muscles has been verified in athletes, as they pose higher lung capacity in comparison to untrained subjects (Prajapati, 2008). More studies have revealed that exercise can result in broncospasm and can lead to an increase in airway resistance which is referred to as Exercise-Induced Asthma (EIA) (Ucok, 2004, Smith, 2002, Mehmet, 2004). Among methods for EIA diagnosis, there are several incremental exercise protocols. In such methods, the respiratory assessment of FEV1/FVC is evaluated after each stage of the protocol. The diagnostic standard for EIA was considered as a 15% decline in FEV1 (Fatemi, 2009, Tan, 1998), more than 10% decline in FEV1 or 15% in force
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