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Research ArticleOriginal Research

Effect of Volume-Oriented Versus Flow-Oriented Incentive Spirometry on Chest Wall Volumes, Inspiratory Muscle Activity, and Thoracoabdominal Synchrony in the Elderly

Adriana C Lunardi, Desiderio C Porras, Renata CC Barbosa, Denise M Paisani, Cibele CB Marques da Silva, Clarice Tanaka and Celso RF Carvalho
Respiratory Care March 2014, 59 (3) 420-426; DOI: https://doi.org/10.4187/respcare.02665
Adriana C Lunardi
Department of Physical Therapy, School of Medicine, University of São Paulo, São Paulo, Brazil.
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Desiderio C Porras
Department of Physical Therapy, School of Medicine, University of São Paulo, São Paulo, Brazil.
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Renata CC Barbosa
Department of Physical Therapy, School of Medicine, University of São Paulo, São Paulo, Brazil.
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Denise M Paisani
Department of Physical Therapy, School of Medicine, University of São Paulo, São Paulo, Brazil.
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Cibele CB Marques da Silva
Department of Physical Therapy, School of Medicine, University of São Paulo, São Paulo, Brazil.
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Clarice Tanaka
Department of Physical Therapy, School of Medicine, University of São Paulo, São Paulo, Brazil.
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Celso RF Carvalho
Department of Physical Therapy, School of Medicine, University of São Paulo, São Paulo, Brazil.
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  • For correspondence: [email protected]
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Abstract

BACKGROUND: Aging causes physiological and functional changes that impair pulmonary function. Incentive spirometry is widely used for lung expansion, but the effects of volume-oriented incentive spirometry (VIS) versus flow-oriented incentive spirometry (FIS) on chest wall volumes, inspiratory muscle activity, and thoracoabdominal synchrony in the elderly are poorly understood. We compared VIS and FIS in elderly subjects and healthy adult subjects.

METHODS: Sixteen elderly subjects (9 women, mean ± SD age 70.6 ± 3.9 y, mean ± SD body mass index 23.8 ± 2.5 kg/m2) and 16 healthy adults (8 women, mean ± age 25.9 ± 4.3 y, mean ± body mass index 23.6 ± 2.4 kg/m2) performed quiet breathing, VIS, and FIS in randomized sequence. Chest wall kinematics (via optoelectronic plethysmography) and inspiratory muscle activity (via surface electromyography) were assessed simultaneously. Synchrony between the superior thorax and abdominal motion was calculated (phase angle).

RESULTS: In the elderly subjects both types of incentive spirometry increased chest wall volumes similarly, whereas in the healthy adult subjects VIS increased the chest wall volume more than did FIS. FIS and VIS triggered similar lower thoracoabdominal synchrony in the elderly subjects, whereas in the healthy adults FIS induced lower synchrony than did VIS. FIS required more muscle activity in the elderly subjects to create an increase in chest wall volume.

CONCLUSIONS: Incentive spirometry performance is influenced by age, and the differences between elderly and healthy adults response should be considered in clinical practice.

  • breathing exercises
  • physical therapy
  • incentive spirometry
  • elderly
  • respiratory mechanics
  • electromyography
  • chest wall
  • biomechanics
  • lung volumes

Introduction

The aging process is associated with a progressive reduction in physiological capacity, which can compromise several organs and systems and impair their function. In the respiratory system, age-related functional changes result from a decrease in the static elastic recoil of the lungs, chest wall compliance, and respiratory muscle strength.1–3 This decrease in the static elastic recoil of the lungs is related to changes in the quantity and composition of the supporting structures within the lung parenchyma.4

The reduced physiological capacity of the respiratory system with aging can predispose vulnerable individuals to an increased risk for respiratory diseases, such as respiratory insufficiency, atelectasis, and respiratory infection.5,6 Some breathing exercises are commonly used in the treatment and prevention of aging-related respiratory conditions.

Incentive spirometry is a type of deep breathing exercise that is widely used for lung expansion and the prevention of pulmonary complications in children, adults, and the elderly.7,8 Two types of incentive spirometry are commercially available: volume-oriented incentive spirometry (VIS) and flow-oriented incentive spirometry (FIS). Both VIS and FIS are used to encourage the patient to inhale to lung capacity through maximal inspiration aided with visual feedback. These maneuvers increase transpulmonary pressure and therefore increase chest-wall volume.9

Parreira et al10 and Paisani et al11 showed that VIS promotes a greater chest wall volume with a larger abdominal contribution than does FIS in healthy adult subjects. In addition, Chang et al (2010)7 and Parreira et al (2005)10 suggested that the inspiratory flow, rather than the type of incentive spirometry, determines the breathing pattern and the respiratory muscle activation in this population.7,10 However, to the best of our knowledge, the effects of VIS and FIS in elderly subjects has not been evaluated. We compared the effects of VIS and FIS on chest wall volume, inspiratory muscle activity, and thoracoabdominal synchrony in healthy elderly and adult subjects.

QUICK LOOK

Current knowledge

It is not known whether volume-oriented and flow-oriented incentive spirometry differently affect chest wall volumes, inspiratory muscle activity, or thoracoabdominal synchrony in the elderly.

What this paper contributes to our knowledge

The 2 types of incentive spirometry similarly increased chest wall volumes and lower thoracoabdominal synchrony in healthy elderly subjects, whereas in healthy adult subjects volume-oriented incentive spirometry increased chest wall volume more. Flow-oriented incentive spirometry required more muscle activity in the elderly subjects to create an increase in chest wall volume.

Methods

This randomized controlled clinical trial was approved by our hospital's research ethics committee (study 606/11), and all subjects provided written informed consent.

Subjects

We recruited 22 healthy elderly (> 65 y old) and 18 healthy adult (< 40 y old) subjects, matched by body mass index and height, from a university population. We excluded patients with deformities of the chest wall or spine, FEV1 or FVC < 80% of predicted, or forced expiratory flow during the middle half of the FVC maneuver < 60% of predicted,11 respiratory symptoms (dyspnea, cough, breathlessness), cardiac disease, or current smoking (Fig. 1).

Fig. 1.
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Fig. 1.

Flow chart.

Devices

The tested FIS was Respiron (NCS, Barueri, São Paulo, Brazil) and the tested VIS was Voldyne 5000 (Hudson RCI/Teleflex Medical, Research Triangle Park, North Carolina), which we chose because they are commonly used in clinical practice. With the Respiron the inhalation raises a ball inside a column, which serves as visible feedback about the inspiratory flow. With the Voldyne the inhalation raises a piston plate, which serves as visible feedback about the inspiratory volume.

Protocol

The assessment of thoracoabdominal kinematics and inspiratory muscle activity was performed during quiet breathing, followed by either VIS or FIS, guided by a respiratory therapist. The order of use (VIS or FIS) was randomly determined via sealed envelopes that were sequentially numbered by an independent researcher. All of the subjects performed 8 quiet breaths, followed by 8 deep breaths, with FIS and VIS, in the order specified by the randomization, with an interval of at least 2 min between the devices. During incentive spirometry the subject was asked to perform 8 breaths with a slow inhalation to raise the ball (FIS) or the piston plate (VIS) and to sustain the inflation for at least 5 seconds, followed by normal exhalation.12,13 An average of 6 homogeneous respiratory cycles was considered for the data analysis, which was performed by a bioengineer. The chest wall volumes and inspiratory muscle activity outcomes were assessed concurrently.

Thoracoabdominal Kinematics

Thoracoabdominal kinematics were evaluated with optoelectronic plethysmography (OEP System, BTS, Garbagnate Milanese, Italy), as previously described.12 This equipment is based on 8 video cameras (solid-state charge-coupled devices) operating at 100 frames per second and synchronized with a flashing infrared light-emitting diode. Four cameras are positioned in front of the subject and 4 behind. Eighty-nine retro-reflective markers are placed on the anterior and posterior sides of the trunk, according to the protocol previously described by Aliverti et al (2009).14 Three-dimensional calibration of the equipment was performed, based on the manufacturer's recommendations. Next, to evaluate the thoracoabdominal kinematics around the chest wall, the assessment was performed with the subject seated on a chair, without back support. The following variables were measured.

Total Chest Wall and Compartmental Volumes.

The optoelectronic plethysmograph's software reconstructs the 3-dimensional position of each marker during the measurements, and computes the volume variations of the whole chest wall and the thoracic and abdominal compartments. The values for the superior and inferior thorax and abdomen are expressed as absolute values and percentages.

Inspiratory Flow.

The mean inspiratory flow is quantified by dividing the total chest wall volume by the total inspiratory time.

Time Variables.

The mean inspiratory time, total breathing cycle time, and the ratio of the inspiratory time to the total breathing cycle time (the duty cycle) are quantified.

Thoracoabdominal Asynchrony.

The thoracoabdominal asynchrony is calculated based on the abdominal phase angle of the superior thorax, per the method of Agostoni et al (1966).15 The phase angle is calculated as the lag time between the peaks of the superior thorax and the abdominal signals, divided by the total breathing cycle time, multiplied by 360°.

Inspiratory Muscle Activity

The activity of the sternocleidomastoid and external superior and inferior intercostal muscles was assessed via electromyography (EMG) (FreeEMG, BTS, Garbagnate Milanese, Italy), simultaneously with the thoracoabdominal kinematics.

Electrode Position.

Each probe was attached to 2 reusable bipolar superficial electrodes, consisting of Ag/AgCl material and a conductive adhesive hydrogel (Maxicor, Brazil). The inter-electrode distance was 20 mm. Before placing the electrode the skin was cleaned with an alcohol swab at the attachment sites to remove oils from the contact surface and thus decrease the impedance of the skin. The superficial electrodes were fixed on the muscle belly, away from the motor point and parallel to the direction of the muscle fibers, in accordance with the European standards for surface EMG of the noninvasive assessment of muscles.16 The right sternocleidomastoid electrode was placed on the muscle body, 5 cm from the mastoid process.17 For the external intercostal muscle of the right superior thorax the electrode was placed on the second anterior intercostal space.18 For the external intercostal muscle of the left inferior thorax electrodes were placed on the seventh and eighth anterior intercostal spaces.18 All of the electrode positions were determined in accordance with the best signal capture, and the EMG analyses were performed as recommended by Hermens et al (2000) (Fig. 2).16

Fig. 2.
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Fig. 2.

Electrode placement. RSL = right sternocleidomastoid muscle. RIC = right external superior intercostal muscle. LIC = left external inferior intercostal muscle.

Data Acquisition and Processing.

Signals were obtained using an 8-channel EMG module with wireless probes, which had an acquisition frequency of 1,000 Hz. Each probe consisted of a mother electrode and a satellite electrode connected via a flexible cable, each fitted with a clip. The mother electrode contained an analog-to-digital converter (with a resolution of 16 bits), an antenna, and a battery. The satellite electrode contained a signal-conditioning, low-pass filter with a frequency of 500 Hz and an amplifier with a gain range of ± 1.62 mV. All of the data were captured and analyzed with the EMG system's software.

In the post-processing stage we applied a Butterworth high-pass filter with a cutoff frequency of 20 Hz, so the signal's frequency range was 20–500 Hz. To detect the linear envelope of the EMG signal, the signal was full-wave rectified and low-pass filtered. The electrical activity of the sternocleidomastoid and upper and lower intercostal muscles are reported as root mean square values.

Statistical Analysis

The sample size calculation was performed based on the mean ± SD difference between the pulmonary volumes generated by the VIS and the FIS (475 ± 71 mL), with a target power of 80%.10 The required sample size was 16 subjects per group. The normality of data distribution was tested with the Shapiro-Wilk test. The homoscedasticity between healthy adults and the elderly was tested with the t test. The analyses of differences between quiet breathing and breathing using incentive spirometry within the groups were via analysis of variance, with the post hoc Holm-Sidak method. Differences were considered significant when P < .05.

Results

Sixteen elderly subjects and 16 healthy adult subjects were evaluated, and all of the subjects presented normal lung function (Table 1).

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Table 1.

Subjects

Thoracoabdominal Volumes

In both the elderly and healthy adult subjects, FIS and VIS induced similar volume increases in the chest wall, superior and inferior thorax, and abdominal compartments, compared to quiet breathing. However, in the elderly subjects FIS and VIS had the same effect, but in the adults VIS caused a greater increase in the chest wall and abdominal compartments than did FIS (Table 2 and Fig. 3).

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Table 2.

Respiratory Variables and Muscle Activity During Quiet Breathing and Incentive Spirometry

Fig. 3.
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Fig. 3.

Percent increases in thoracic and abdominal compartment volumes during flow-oriented versus volume-oriented incentive spirometry in healthy adult and elderly subjects. * P < .05 for volume-oriented versus flow-oriented.

Respiratory Cycles, Thoracoabdominal Synchrony, and Inspiratory Flow

In the elderly subjects, neither FIS nor VIS significantly changed the inspiratory time or total breathing cycle time, compared to quiet breathing. In the adult subjects VIS increased the inspiratory time and total breathing cycle time, compared to FIS and quiet breathing (see Table 2). In both groups the inspiratory flow was higher during incentive spirometry than during quiet breathing, but there were no significant difference between the devices or groups (see Table 2).

In the elderly subjects both FIS and VIS induced lower thoracoabdominal synchrony (higher values) than did quiet breathing. In the adults only FIS significantly changed thoracoabdominal synchrony (see Table 2).

Inspiratory Muscle Activity

In both the elderly and adult subjects there were no significant differences in sternocleidomastoid or superior or inferior intercostal muscle electrical activity during FIS or VIS (see Table 2). However, during FIS the inspiratory muscles activity per chest wall volume was higher in the elderly subjects than it was in the adults (Fig. 4).

Fig. 4.
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Fig. 4.

Ratio of total respiratory muscle activity to total inspired lung volume. * P = < .05 compared to quiet breathing and volume-oriented incentive spirometry. † P < .05 = compared to flow-oriented incentive spirometry and volume-oriented incentive spirometry in healthy elderly subjects.

Discussion

VIS and FIS are widely used to reverse or prevent reductions in chest wall volumes, and incentive spirometry is employed in healthy adult subjects and the elderly as if the effect would be similar independent of the subject's age. In healthy adults, previous studies have reported that VIS induced greater chest wall expansion and abdominal displacement10,11,19 and lower inspiratory muscle activity9,11,20 and work of breathing21,22 than FIS. However, to the best of our knowledge the advice to use incentive spirometry has never been investigated in elderly subjects. This seems important because aging reduces chest wall compliance, decreases the size and number of respiratory muscle fibers, and causes changes in thoracoabdominal motion23 that can alter performance during incentive spirometry.

In our elderly subjects FIS required greater inspiratory muscle activity to generate similar volumes than did VIS, whereas in our adult subjects there was no significant difference in inspiratory muscle activity between FIS and VIS (see Fig. 3). This suggest that the subject's age must be considered when prescribing incentive spirometry, especially in elderly subjects who have symptoms or signs of respiratory muscle wasting. Interestingly, this increase in respiratory muscle activity was observed even in healthy elderly subjects, and might be explained by the elderly having reduced lung volumes and chest wall capacities,23,24 which place the diaphragm at a mechanical disadvantage in generating effective contraction.1,25

FIS and VIS induced similar volumes and displacement in all the thoracoabdominal compartments in the elderly, whereas in the adult subjects VIS induced greater abdominal displacement than did FIS.10,11 Contrary to the findings of previous studies, our adult subjects did not have higher sternocleidomastoid activity during FIS.10,11 The difference between our results and those studies might be due to differences in how the subjects were advised to perform incentive spirometry, or to different EMG electrode positioning. In our study the electrode positioning was standardized and the same researcher oriented all the subjects similarly. In addition, electrode positioning was performed as previously described in the literature,17,18 and the EMG signal capture and analyses were performed per international guidelines.16

Also contrary to other studies in healthy adult subjects,9,26 VIS and FIS induced similar inspiratory flow and similarly reduced thoracoabdominal synchrony in the elderly. Interestingly, our elderly subjects had shorter inspiratory time than did our adult subjects, which can be explained by aging-related physiological changes in the lung and respiratory system, which require greater inspiratory muscle activity that can reduce thoracoabdominal synchrony (higher values). Our hypothesis is supported by the finding that the inspiratory time in the adult subjects was twice that in the elderly (see Table 2), and, as a consequence, during VIS the elderly could not expand the chest wall as much as the healthy adult subjects could.

Limitations

First, the effects of incentive spirometry were evaluated in subjects with normal lung function; however, our research group is conducting studies in other populations, to increase the practical applicability of incentive spirometry. Second, muscle activity was evaluated with surface EMG, and there is no consensus about electrode positioning for the respiratory muscles. We placed the electrodes according to previous studies by experts in this field. In contrast, we used a novel technology for thoracoabdominal analysis, and it is the only available equipment that allows for simultaneous measurement of volume displacement and respiratory muscle activity.

Our results provide important information using incentive spirometry in clinical practice, despite that the prevention and treatment of respiratory complications using these devices as monotherapy remains poorly understood.27 It might also be important for future studies to evaluate incentive spirometry, either as monotherapy or associated with other respiratory care techniques, in various clinical situations, to determine appropriate therapy for the elderly.

Conclusions

FIS and VIS provided similar increases in chest wall and compartmental volumes in the elderly, but FIS required greater inspiratory muscle activity. Therefore, when evaluating a patient for incentive spirometry the clinician should consider the patient's age and clinical condition, as well as the goal of therapy.

Footnotes

  • Correspondence: Celso RF Carvalho PT PhD, Department of Physical Therapy, School of Medicine, University of São Paulo, Rua Cipotânea 51, São Paulo, Brazil, 05360-160. E-mail: cscarval{at}usp.br.
  • This study was partly supported by grants 2010/50120-4 and 2010/19196-4 from Fundação de Amparo à Pesquisa do Estado de São Paulo, São Paulo, Brazil.

  • The authors have disclosed no conflicts of interest.

  • Copyright © 2014 by Daedalus Enterprises

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Respiratory Care: 59 (3)
Respiratory Care
Vol. 59, Issue 3
1 Mar 2014
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Effect of Volume-Oriented Versus Flow-Oriented Incentive Spirometry on Chest Wall Volumes, Inspiratory Muscle Activity, and Thoracoabdominal Synchrony in the Elderly
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Effect of Volume-Oriented Versus Flow-Oriented Incentive Spirometry on Chest Wall Volumes, Inspiratory Muscle Activity, and Thoracoabdominal Synchrony in the Elderly
Adriana C Lunardi, Desiderio C Porras, Renata CC Barbosa, Denise M Paisani, Cibele CB Marques da Silva, Clarice Tanaka, Celso RF Carvalho
Respiratory Care Mar 2014, 59 (3) 420-426; DOI: 10.4187/respcare.02665

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Effect of Volume-Oriented Versus Flow-Oriented Incentive Spirometry on Chest Wall Volumes, Inspiratory Muscle Activity, and Thoracoabdominal Synchrony in the Elderly
Adriana C Lunardi, Desiderio C Porras, Renata CC Barbosa, Denise M Paisani, Cibele CB Marques da Silva, Clarice Tanaka, Celso RF Carvalho
Respiratory Care Mar 2014, 59 (3) 420-426; DOI: 10.4187/respcare.02665
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Keywords

  • breathing exercises
  • physical therapy
  • incentive spirometry
  • elderly
  • respiratory mechanics
  • electromyography
  • chest wall
  • biomechanics
  • lung volumes

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Print ISSN: 0020-1324        Online ISSN: 1943-3654

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