Key result
Six-minute all-out rowing linked to ~12% lower supine DLCO, driven by decreased pulmonary blood volume.
Why the study?
The mechanisms underlying postexercise reduction in pulmonary diffusion capacity and its relation to central blood volume changes in athletes were not fully understood.
Does a 6-min "all-out" row reduce pulmonary diffusion capacity and central blood volume in oarsmen compared to controls?
Observational (n=15)
Does a 6-min "all-out" row reduce pulmonary diffusion capacity and central blood volume in oarsmen compared to controls?
p-value: p=< 0.05
Approximately one-half of the postexercise reduction in pulmonary diffusion capacity is explained by a decrease in pulmonary blood volume, associated with central blood volume depletion.
May inform post-exercise lung function interpretation in athletes; leaves open ANP's causal role in central volume depletion.
Pulmonary diffusion capacity for carbon monoxide (DLCO), regional electrical impedance (Z0), and the distribution of technetium-99m-labeled erythrocytes together with concentration of plasma atrial natriuretic peptide (ANP) were determined before and after a 6-min "all-out" row in nine oarsmen and in six control subjects. Two and one-half hours after exercise in the upright seated position, DLCO was reduced by 6 (-2 to 21; median and range) %, the thoracic-to-thigh electrical impedance ratio (Z0 thorax/Z0 thigh) rose by 14 (-1 to 29) %, paralleled by a 7 (-3 to 11) % decrease and a 3 (-5 to 12) % increase in the thoracic and thigh blood volume, respectively. These responses were associated with a decrease in the plasma ANP concentration from 15 (13-31) to 12 (9-27) pmol/l (P < 0.05). Similarly, in the supine position, Z0 thorax/Z0 thigh increased by 10 (-5 to 28) % when DLCO was reduced 12 (6-26) % (P < 0.05), whereas DLCO remained stable in the control group. The increase in Z0 thorax/Z0 thigh and the corresponding redistribution of the blood volume in both body positions show that approximately one-half of the postexercise reduction of DLCO is explained by a decrease in the pulmonary blood volume. The role of a reduced postexercise central blood volume is underscored by the lower plasma ANP, which aids in upregulating the blood volume after exercise in athletes.
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Hanel et al. (1997) conducted an observational in Postexercise physiological changes (n=15). 6-min all-out row vs. Control subjects was evaluated on Reduction in pulmonary diffusion capacity for carbon monoxide (DLCO) in the supine position (p=< 0.05). A 6-minute all-out row reduced supine pulmonary diffusion capacity by 12% (P<0.05), driven by a decrease in pulmonary blood volume and associated with lower plasma ANP.
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