Specificity and reversibility of inspiratory muscle training
Specificity and reversibility of inspiratory muscle training
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DOI：
10.1249/01.mss.0000048642.58419.1e
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发表时间：
2003-02-01
期刊：
影响因子：
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通讯作者：
McConnell, AK
中科院分区：
文献类型：
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作者：
Romer, LM;McConnell, AK
目的：本研究的目的是评估的压力-流量特异性的适应吸气肌训练（IMT），除了时间的影响，停训和减少频率的训练后，这些适应。研究方法：24名健康受试者被随机分配到四组之一（A：低流量-高压IMT; B：高流量-低压IMT; C：中等流量-压力IMT;和D：无IMT）。受试者进行IMT 6 d.wk（-1）共9 wk，并在基线和每3 wk评价吸气肌功能。然后将A、B和C组随机分为维持组（M）（IMT 2 d.wk（-1））或停训组（DT）（无IMT）。在IMT后9和18周重新评估吸气肌功能。结果如下：在9周时，A组的压力增加最大，B组的流量增加较大，C组的压力和流量增加更均匀，D组的压力和流量没有变化。A组、B组和C组的最大吸气肌力分别增加了48 +/-3%、25 +/-3%和64 +/-3%（平均值+/- SEM，P小于或等于0.01）。A、B和C组的最大压力发展速率分别增加59 +/-1%、10 +/-1%和29 +/-1%（P小于或等于0.01）。DT组在IMT后9周观察到吸气肌功能下降。吸气肌功能在9 - 18周之间达到稳定，但仍高于IMT前值。M组保留了吸气肌功能的改善。结论：这些数据支持IMT的压力-流量特异性的概念。停止训练导致吸气肌功能的小但显著的降低。减少三分之二的训练频率允许维持吸气肌功能长达18周后IMT。
Purpose: The purpose of this study was to evaluate the pressure-flow specificity of adaptations to inspiratory muscle training (IMT), in addition to the temporal effects of detraining and reduced frequency of training upon these adaptations. Methods: Twenty-four healthy subjects were assigned randomly to one of four groups (A: low-flow-high-pressure IMT; B: high-flow-low-pressure IMT; C: intermediate flow-pressure IMT; and D: no IMT). Subjects performed IMT 6 d.wk(-1) for 9 wk, and inspiratory muscle function was evaluated at baseline and every 3 wk. Groups A, B, and C were then assigned randomly to either a maintenance group (M) (IMT 2 d.wk(-1)) or a detraining group (DT) (no IMT). Inspiratory muscle function was reassessed at 9 and 18 wk post-IMT. Results: At 9 wk, group A exhibited the largest increase in pressure, B a large increase in flow, C more uniform increases in pressure and flow, and D no changes in pressure or flow. Maximum inspiratory muscle power increased in groups A, B, and C by 48 +/- 3%, 25 +/- 3%, and 64 +/- 3%, respectively (mean +/- SEM, P less than or equal to 0.01). Maximum rate of pressure development increased in groups A, B, and C by 59 +/- 1%, 10 +/- 1%, and 29 +/- 1%, respectively (P less than or equal to 0.01). A decrease in inspiratory muscle function was observed at 9 wk post-IMT in DT. Inspiratory muscle function plateaued between 9 and 18 wk but remained above pre-IMT values. Group M retained the improvements in inspiratory muscle function. Conclusion: These data support the notion of pressure-flow specificity of IMT. Detraining resulted in small but significant reductions in inspiratory muscle function. Reducing training frequency by two thirds allowed for the maintenance of inspiratory muscle function up to 18 wk post-IMT.