Trials to Criteria for Residual Lung Volume in College Aged Females
Kristin A. MathewsRebecca RomineJuliane GenevroMichael YeeRyan KunkleMarissa SumidaRonald K. Hetzler
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PURPOSE: To determine the number of trials needed to achieve a RLV measurement on land or submerged in water that compares to the recommended criteria value. METHODS: Thirty female subjects (22.5 ± 3.8 yr, 167.3 ± 9.1 cm, 66.9 ± 9.7 kg) had RLV collected 5 times across two different conditions (on land and fully submerged in water). Separate repeated-measures ANOVA were used to compare RLV means across the following criteria: means of the first two trials (FIR), the first two consecutive trials within 100mL (ROW), the first two trials (consecutive or non-consecutive) within 100ml (WIN), the lowest two trials within 100ml (LOW), and the number of trials necessary to satisfy criteria (TTC) of FIR, ROW, WIN and LOW. The alpha level was set at p<0.05. RESULTS: There was no significant difference between RLV means on land or submerged. When measured on land, TTC for FIR was significantly less than ROW, WIN, and LOW, and it took significantly more trials to obtain LOW than ROW and WIN. There was no significant difference between TTC for ROW and WIN on land. Mean differences between TTC for FIR, ROW, WIN and LOW submerged were all significantly different.Table 1: Mean for RLV(L) across trials on land and submerged in water, and of FIR, ROW, WIN, LOW, and TTC in each condition.CONCLUSION: In young, healthy females the lack of significance between trials suggests that two trials may be sufficient to determine RLV. However, because significant differences between trials to reach criteria exist, the number of trials needed to determine RLV depends upon the criteria selected. Based on means and standards deviations, it is recommended that at least 4 trials be used for ROW and WIN, and at least 5 trials be used to determine LOW for accurate determination of an individual’s RLV.Cite
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