Publication Date

1998

Document Type

Dissertation/Thesis

First Advisor

Plowman, Sharon A.

Degree Name

M.S. Ed. (Master of Education)

Department

Department of Physical Education

LCSH

Rowing--Physiological aspects||Respiration

Abstract

The lower lumbar vertebrae of rowers are subjected to high levels of shear and compression at mid-drive during the rowing stroke, and these forces may be partially neutralized by increasing intra-abdominal pressure (IAP). Since IAP fluctuates with ventilation, the purpose of this study was to compare the IAP response between two breathing patterns, inspiring during the drive and expiring during the drive, to determine if one breathing pattern might increase the IAP at mid-drive more than the other. Ten moderately active volunteers (5M, 5F; age: 25.1 yr ± 2.9; Ht: 176.4 cm ± 6.6; Wt: 73.6 kg ± 12.3) with and without rowing experience performed two sets (inspiration and expiration) of five 2-minute intervals on a Concept II rowing ergometer. The intervals began at a workload of 100 watts (W) and increased to 200 W by increments of 25 W. IAP was measured every .032 s for 30 s during each interval using a pressure transducer catheter. A position sensor was attached to the seat of the ergometer and interfaced with the data acquisition program so that the IAP responses could be expressed relative to the position of the body during the drive. Statistical analyses were completed using a 2 x 5 (breathing pattern by workload) repeated measures analysis of variance with Tukey or dependent 1-test follow-ups. There was no interaction between breathing pattern and workload for the dependent variables minimum IAP (IAPmin), maximum IAP (IAPmax) or change in IAP (?IAP) (p>.05); however, there was a significant interaction for middrive IAP (M-D IAP), with M-D IAP increasing at a greater rate as workload increased while expiring during the drive than inspiring during the drive (p<.05). When collapsed across breathing patterns, a significant difference in IAPmin, IAPmax, ?IAP and M-DIAP occurred as workload increased (p<.05). When collapsed across workload, a significant difference occurred in IAPmin and M-D IAP between the two breathing patterns (p<.05), but there was no difference in either IAPmax or ?IAP (p>.05). The data show that expiring during the drive offers more protection to the lower lumbar vertebrae at middrive than inspiring during the drive.

Comments

Includes bibliographical references (pages [63]-65)

Extent

vii, 91 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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