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The Effect of Different Training Loads on the Lung Health of Competitive Youth Swimmers.
Airway hyperresponsiveness (AHR), airway inflammation, and respiratory symptoms are common in competitive swimmers, however it is unclear how volume and intensity of training exacerbate these problems. Thus, our purpose was to measure AHR, inflammation, and respiratory symptoms after low, moderate, and high training loads in swimmers. Competitive youth swimmers (n=8) completed nine weeks of training split into three blocks (Low, Moderate, and High intensity). Spirometry at rest and post-bronchial provocation [Eucapnic Voluntary Hyperpnea (EVH)] and Fractional Exhaled Nitric Oxide (FeNO) were completed at the end of each training block. A weekly self-report questionnaire determined respiratory symptoms. Session Rating of Perceived Exertion (sRPE) quantified internal training loads. Internal load was significantly lower after Moderate training (4840 ± 971 AU) than after High training (5852 ± 737 AU) ( p = 0.02, d = 1.17). Pre-EVH FEV1 was significantly decreased after Moderate (4.52 ± 0.69 L) compared to Low (4.74 ± 0.63 L) ( p = 0.025, d = 0.326), but not different from High load. Post-EVH FeNO after Moderate training was significantly decreased (9.4 ± 4.9 ppb) compared to Low training (15.4 ± 3.6 ppb) ( p = 0.012, r = 0.884). Respiratory symptom frequency was significantly correlated with percent decrease in FEV1 20 minutes post-EVH after Low and Moderate loads (both ρ = -0.71, sig = 0.05), and after High load was significantly correlated with percent decrease in FEV1 at 10 (ρ = -0.74, sig = 0.03), 15 (ρ = -0.91, sig = 0.00), and 20 minutes post (ρ = -0.75, sig = 0.03). In conclusion, Moderate load training resulted in the worst lung health results, suggesting there may be factors other than the total amount of stress within training blocks that influence lung health. Further research is needed to determine the effect of manipulating specific acute training load variables on the lung health of swimmers.
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