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The 20 Meter Shuttle Test as a measure of cardio-respiratory fitness in young adults with asthma.

(1) Litwin, Bini; (1) Bartlett, Maria; (1) Jez, Marcin; (1) Mago, Ramneek. 1Nova Southeastern University, Plantation, FL, United States.

Purpose/Hypothesis: People with asthma have marked physiological changes in lung volume and airflow during exercise, limiting them from performing at an optimal cardio respiratory level. Evidence shows the 20 Meter Shuttle Test (20MST) is a valid measure of cardio-respiratory fitness in well and impaired populations, including people with asthma. However, most studies have been conducted over 10 years ago, and primarily with non US populations. To provide more current evidence applicable to a US population, this pilot study investigated the use of the 20MST as a measure of cardio-respiratory fitness in young adults with asthma. Number of Subjects: In this descriptive pilot study, five young adults with asthma served as subjects. Ages ranged from 25-32, 4 female and 1 male. Three subjects were Caucasian and 2 were African American. All subjects had been diagnosed with pre-existing asthma limited to mild intermittent or mild persistent asthma. Materials/ Methods: The five subjects completed a 20MST and a Modified Bruce Treadmill Test (MBTT) in random order. Heart rate (HR), blood pressure (BP), oxygen saturation (SpO2), respiratory rate (RR) and rate of perceived exertion (RPE) were measured at baseline, test completion and 5 minutes post for both tests as well as every two minutes during the MBTT. Target heart rate (THR) was calculated at 85% of maximum heart rate (MHR). Results: Three of the five subjects reached THR during the 20MST, while two subjects displayed symptom limiting signs (SpO2 levels 88% or be-low) that required termination of the 20MST at 92% THR. All subjects reached THR during the MBTT. Peak increases in HR, BP and RR were attained in a shorter time period by all subjects with the 20MST as compared to the MBTT. The average time for completion of the 20MST was 2 minutes 52 seconds as compared to 13 minutes 53 seconds to complete the MBTT. Conclusions: Results indicate the 20MST may be an effective and efficient measure of cardio-respiratory fitness in young adults with asthma. The limitation of the 20MST appears to be the symptom limiting ventilatory response that is likely attributed to the restrictive nature of asthma, even in those individuals whose asthma is well controlled. Further research is warranted with a larger sample to measure oxygen consumption during the 20MST to establish the validity of the 20MST as a measure of cardio-respiratory fitness in young adults with asthma. Clinical Relevance: These findings demonstrate potential use of the 20MST as a measure of cardio-respiratory fitness that is low in cost, easy to administer and able to facilitate attainment of established parameters in a shorter time period as com-pared to treadmill tests that require special equipment. The 20MST also allows ease of administration in field conditions as well as within a clinical setting.
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Publication:Cardiopulmonary Physical Therapy Journal
Date:Dec 1, 2011
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