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Use of Breath Stacking Technique on Regional Ventilation in Box Chest in Women With Morbid Obesity

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01551277
Recruitment Status : Completed
First Posted : March 12, 2012
Last Update Posted : March 12, 2012
Information provided by (Responsible Party):
Daniella Cunha Brandao, Universidade Federal de Pernambuco

Brief Summary:
Objectives: To evaluate the effects of the technique of Breath Stacking (BS) in the distribution of ventilation in the chest in women with morbid obesity. Methods: Randomized clinical trial, blinded, and controlled with 32 women (BMI ≥ 40kg/m2), separated into two groups: control (GC) with n = 16 and 41.94 ± 9.38 years and group Breath Stacking (GBS) , n = 16 and 40.38 ± 10.16 years. Optoelectronic plethysmography (POE) was used to assess lung ventilation. For the BS technique was used to mask the expiratory branch occluded and Wright spirometer. GBS held three techniques with an interval of three minutes. The GC used the same circuit without the occlusion of the expiratory branch. Results: GBS was found to be higher in the contribution of tidal volume (VT) into the chest circumference (p = 0.04) and decrease in abdominal compartment (p = 0.03), whereas the CG showed no difference in distribution. Spirometric variables: FEV1 (%), FVC (%), FEV1/FVC (%), VC and CI showed no difference before and after the technical BS and GBS in the GC. Conclusions: The technique BS altered the distribution pattern of regional ventilation, resulting in greater contribution in lung volume in the lower rib cage, corresponding to activity of the diaphragm, with redistribution of volume between compartments.

Condition or disease Intervention/treatment Phase
Morbidly Obese Other: Placebo-BREATH STACKING Other: BREATH STACKING Not Applicable

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 32 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double (Participant, Care Provider)
Primary Purpose: Treatment
Official Title: Use of Breath Stacking Technique on Regional Ventilation in Box Chest in Women With Morbid Obesity: Clinical Trial Controlled and Randominzado
Study Start Date : March 2010
Actual Primary Completion Date : December 2010
Actual Study Completion Date : January 2011

Arm Intervention/treatment
Placebo Comparator: Control Group Other: Placebo-BREATH STACKING
The control group used the same circuit in the intervention group, but without occlusion of the expiratory branch and followed the same protocol to capture the images, ie, basal respiration for five minutes, then three periods of breathing through the mask, the equivalent time the period of technical BS, and five minutes of respiration. The volunteers were instructed to maintain respiration during the period they were using the mask.

In the intervention group used a silicon mask, involving the nose and mouth with two outputs, one containing the Wright spirometer MARK 8 analog output and the other was occluded. It was explained that the mask would only allow the air entering during inspiration, and that should inspire the volunteer gradually filling the lungs with air until you feel that completely filled with an average time of 20 seconds, as shown in figure 1 obtained during the method of BS. The end of the technique would be in two situations: when the volunteer asked for it through a hand gesture, or when prearranged by Wright spirometer, was observed by the researcher that there was no change in the inspired volume.

Primary Outcome Measures :
  1. Chest wall regional volume [ Time Frame: ten months ]
    We considered as primary outcome regional tidal volumes: total current volume of the chest cavity (Vc), changes in tidal volume of pulmonary rib cage (ΔVc, ctp), tidal volume variation of the abdominal rib cage (ΔVc, CTA) and abdominal tidal volume (ΔVc, ab), and secondary outcome Inspiratory capacity (IC).

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Ages Eligible for Study:   19 Years to 60 Years   (Adult)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Women aged 19-60 years
  • BMI ≥ 40 kg/m2

Exclusion Criteria:

  • Women with chronic lung disease
  • Smokers
  • Neuromuscular disease
  • Disability in performing the procedures

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01551277

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Universidade Federal de Pernambuco
Recife, Pernambuco, Brazil
Sponsors and Collaborators
Universidade Federal de Pernambuco
Publications of Results:
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Responsible Party: Daniella Cunha Brandao, PhD, Universidade Federal de Pernambuco Identifier: NCT01551277    
Other Study ID Numbers: jaqueline 01
First Posted: March 12, 2012    Key Record Dates
Last Update Posted: March 12, 2012
Last Verified: March 2012
Additional relevant MeSH terms:
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Obesity, Morbid
Nutrition Disorders
Body Weight
Signs and Symptoms