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Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
Online ISSN 1827-1928
Alessandro RUBINI 1, Alex RIZZATO 1, Simone FAVA 1, Nicola OLIVATO 1, Devanand MANGAR 2, Enrico M. CAMPORESI 2, Gerardo BOSCO 1
1 Physiological Laboratory, Department of Biomedical Sciences, University of Padua, Padua, Italy; 2 TEAMHealth Research Institute, TGH, Tampa, FL, USA
BACKGROUND: An increased sympathetic activity during muscular effort is a well established physiological response, whose intensity is known to increase with the muscular load. Spirometry was described to improve as an effect of swimming training in healthy and asthmatic subjects, suggesting a decrease in airway resistance The aim was to investigate the possible effect of muscular exercise (swimming) on spirometry, in particular searching for possible differences because of different swimming times.
METHODS: The measurements were performed on 9 highly trained male competitive swimmers (age: 41± 12,79 yrs., height: 1,69± 0,06 m., weight: 66,14± 14,28 Kg., BMI: 22,8± 3,61 kg/m2) during an official competition. The data were collected at the border of the swimming-pool before (control, C) and few minutes after the swimming sessions (exercise, E), which consisted either of 800 m (7 subjects) or 1500 m (5 subjects) free style.
RESULTS: A general trend indicating a post-exercise increase in spirometry was observed. We found post-exercise significant increments in FEV1 and in MEF75 for both the 800 and 1500 m swimming sessions, and in FEF25-75 and in MEF25 for the shorter distance.
CONCLUSIONS: We conclude that, as it may be expected, muscular exercise induces an improvement of spirometry both because of a smooth muscle relaxation-induced modulation of airway diameter and resistance to airflow, and because of an enhanced expiratory muscle contraction strength. Both of these mechanisms are related to an increased sympathetic activity which is well known to accompany muscular exercise.