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Table 3 Breathing pattern before and after respiratory muscle training

From: Combination of inspiratory and expiratory muscle training in same respiratory cycle versus different cycles in COPD patients: a randomized trial

 

Sham training

(n=23)

IMT

(n=23)

CTSC

(n=23)

CTDC

(n=23)

P 2

RR(breaths/min)

 Pre-test

20.3 (18.6 to 21.9)

20.3 (18.7 to 22)

20.7 (19 to 22.3)

20.0 (18.3 to 21.6)

 

 Post-test

20.1 (18.6 to 21.6)

20.1 (18.6 to 21.6)

18.7 (17.1 to 20.2)

19.8 (18.3 to 21.3)

P2=0.949

 P1

0.584

0.275

<0.01

0.466

 

Ti(S)

 Pre-test

1.489 (1.353 to 1.624)

1.481 (1.346 to 1.617)

1.435 (1.299 to 1.570)

1.501 (1.366 to 1.637)

 

 Post-test

1.486 (1.354 to 1.617)

1.435 (1.303 to 1.566)

1.388 (1.257 to 1.520)

1.457 (1.325 to 1.588)

P2=0.851

 P1

0.691

<0.01

<0.01

<0.01

 

Te(S)

 Pre-test

1.751 (1.521 to 1.980)

1.719 (1.489 to 1.948)

1.687 (1.457 to 1.916)

1.661 (1.431 to 1.890)

 

 Post-test

1.755 (1.527 to 1.984)

1.757 (1.528 to 1.985)

1.752 (1.524 to 1.981)

1.723 (1.495 to 1.952)

P2=0.989

 P1

0.571

<0.01

<0.01

<0.01

 

Ti/Ttot

 Pre-test

0.466 (0.434 to 0.497)

0.474 (0.442 to 0.506)

0.476 (0.444 to 0.508)

0.488 (0.456 to 0.520)

 

 Post-test

0.466 (0.435 to 0.496)

0.460 (0.430 to 0.490)

0.457 (0.427 to 0.488)

0.470 (0.439 to 0.500)

P2=0.922

 P1

0.886

<0.01

<0.01

<0.01

 

Vt(L)

 Pre-test

0.469 (0.447 to 0.491)

0.467 (0.444 to 0.489)

0.463 (0.441 to 0.485)

0.479 (0.457 to 0.501)

 

 Post-test

0.465 (0.444 to 0.485)

0.471 (0.450 to 0.492)

0.462 (0.441 to 0.482)

0.477 (0.457 to 0.498)

P2=0.762

 P1

0.127

0.127

0.645

0.539

 

IC(L)

 Pre-test

1.613 (1.461 to 1.766)

1.568 (1.416 to 1.720)

1.541 (1.389 to 1.693)

1.665 (1.513 to 1.818)

 

 Post-test

1.600 (1.456 to 1.744)

1.575 (1.431 to 1.720)

1.537 (1.393 to 1.682)

1.652 (1.508 to 1.796)

P2=0.909

 P1

0.068

0.313

0.634

0.077

 
  1. Data are presented as adjusted mean differences (95% confidence interval of the differences) unless otherwise indicated; P1 results of mixed linear model comparison of baseline versus week 8 in each group (within-subject effects); P2 results of mixed linear model comparison among the four groups(between-group effects)
  2. Abbreviations: RR respiratory rate, Ti inspiratory time, Te expiratory time, Ti/Ttot inspiratory time/ total breath cycle duration, Vt tidal volume, IC inspiratory capacity