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작성일 2016-10-25 조회수 647
파일첨부 BROWN_IMTreducesBloodLactateConcentrationDuringVolitionalHyperpnoea.pdf
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(PB)Inspiratory muscle training reduces blood lactate concentration
Abstract Although reduced blood lactate concentrations ([lac-]B) have been observed during whole-body exercise following inspiratory muscle training (IMT), it remains unknown whether the inspiratory muscles are the source of at least part of this reduction. To investigate this, we tested the hypothesis that IMT would attenuate the increase in [lac-]B caused by mimicking, at rest, the breathing pattern observed during high-intensity exercise. Twenty-two physically active males were matched for 85% maximal exercise minute ventilation _V E max and divided equally into an IMT or a control group. Prior to and following a 6 week intervention,
participants performed 10 min of volitional hyperpnoea at the breathing pattern commensurate with 85% _VE max : The IMT group performed 6 weeks of pressure-threshold IMT; the control group performed no IMT. Maximal inspiratory mouth pressure increased (mean ± SD) 31 ± 22% following
IMT and was unchanged in the control group. Prior to the intervention in the control group, [lac-]B increased from 0.76 ± 0.24 mmol L-1 at rest to 1.50 ± 0.60 mmol L-1 (P\0.05) following 10 min volitional hyperpnoea. In the IMT group, [lac-]B increased from 0.85 ± 0.40 mmol L-1 at rest to 2.02 ± 0.85 mmol L-1 following 10 min volitional hyperpnoea (P\0.05). After 6 weeks, increases in [lac-]B during volitional hyperpnoea were unchanged in the control group. Conversely, following IMT the increase in [lac-]B during volitional hyperpnoea was reduced by 17 ± 37% and 25 ± 34% following 8 and 10 min, respectively (P\0.05). In conclusion, increases in [lac-]B during volitional hyperpnoea at 85% _VE max were attenuated following IMT. These findings suggest that the inspiratory muscles were the  source of at least part of this reduction, and provide a possible explanation for some of the IMT-mediated reductions in [lac-]B, often observed during wholebody
exercise.
이전글 (PB)The effect of inspiratory muscle training upon maximum lactate
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