November 16, 2018 Conference paper Open Access

West, C.R.; Gee, C.M.; Williams, A.M.; Sheel, A.W.; Eves, N.D.

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    <subfield code="a">6th International RehabMove State-Of-The-Art Congress 2018</subfield>
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    <subfield code="a">RehabMove 2018: EFFECT OF RESPIRATORY MUSCLE TRAINING ON EXERCISE CAPACITY AND RESPIRATORY MECHANICS IN ATHLETES WITH TETRAPLEGIA</subfield>
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    <subfield code="a">&lt;p&gt;&lt;strong&gt;PURPOSE&lt;/strong&gt;: To examine whether six weeks combined inspiratory and expiratory respiratory muscle&lt;br&gt;
training (RMT) improves peak exercise capacity and respiratory mechanics during sub-maximal exercise&lt;br&gt;
in wheelchair rugby athletes with tetraplegia.&lt;br&gt;
&lt;strong&gt;METHODS&lt;/strong&gt;: Six athletes (5M/1F, 33&amp;plusmn;5 years) were assessed for maximal, sub-maximal and field-based&lt;br&gt;
exercise performance pre and post six-week pressure-threshold RMT, and again following six-weeks of&lt;br&gt;
no RMT. During each testing session, athletes first completed a ramped arm-ergometer exercise test to&lt;br&gt;
exhaustion for the determination of peak work rate and peak oxygen uptake. Following a 30 minute break,&lt;br&gt;
athletes completed a sub-maximal arm-ergometer test at 20, 40, 60, and 80% of peak work rate. Inspiratory&lt;br&gt;
capacity maneuvers were performed in the final minute of each stage to determine end-expiratory lung&lt;br&gt;
volume (EELV) and calculate end-inspiratory lung volume (EILV). Breath-by-breath cardiopulmonary&lt;br&gt;
indices were recorded throughout both exercise tests. On a separate day, athletes were assessed for time&lt;br&gt;
to complete a field-based 20x20 metre repeated sprint test.&lt;br&gt;
&lt;strong&gt;RESULTS&lt;/strong&gt;: Following RMT, there were increases in peak work rate (69&amp;plusmn;22 post vs. 60&amp;plusmn;20 W pre, p=0.03),&lt;br&gt;
oxygen uptake (20.3&amp;plusmn;5.9 vs. 17.6&amp;plusmn;5.0 mL/kg/min, p=0.04), and minute ventilation (54&amp;plusmn;18 vs. 46&amp;plusmn;12 L/min,&lt;br&gt;
p=0.03). Dynamic hyperinflation was present during all tests as evidenced by an increase in EELV with&lt;br&gt;
increasing exercise intensity; however, during post-RMT testing both EELV and EILV were significantly&lt;br&gt;
lower than pre-RMT throughout exercise (p&amp;lt;0.05). At follow-up, no indices were different from post-RMT.&lt;br&gt;
Field-based repeat sprint performance was unchanged by RMT.&lt;br&gt;
&lt;strong&gt;DISCUSSION&lt;/strong&gt;: RMT enhances exercise capacity in athletes with tetraplegia. Whether this is due to an&lt;br&gt;
increased peak ventilation or the circulatory benefits of an enhanced respiratory muscle pump, lower&lt;br&gt;
operating lung volumes, and/or an attenuation of the respiratory muscle metaboreflex remains to be&lt;br&gt;
determined.&lt;/p&gt;</subfield>
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