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Peak Flow Measure: an Index of Respiratory Function? International Journal of Health Sciences and Research www.ijhsr.org ISSN: 2249-9571 Original Research Article Peak Flow Measure: An Index of Respiratory Function? D. Devadiga, Aiswarya Liz Varghese, J. Bhat, P. Baliga, J. Pahwa Department of Audiology and Speech Language Pathology, Kasturba Medical College (A Unit of Manipal University), Mangalore -575001 Corresponding Author: Aiswarya Liz Varghese Received: 06/12/2014 Revised: 26/12/2014 Accepted: 05/01/2015 ABSTRACT Aerodynamic analysis is interpreted as a reflection of the valving activity of the larynx. It involves measuring changes in air volume, flow and pressure which indicate respiratory function. These measures help in determining the important aspects of lung function. Peak expiratory flow rate is a widely used respiratory measure and is an effective measure of effort dependent airflow. Aim: The aim of the current study was to study the peak flow as an aerodynamic measure in healthy normal individuals Method: The study group was divided into two groups with n= 60(30 males and 30 females) in the age range of 18-22 years. The peak flow was measured using Aerophone II (Voice Function Analyser). The anthropometric measurements such as height, weight and Body Mass Index was calculated for all the participants. Results: The peak airflow was higher in females as compared to that of males. It was also observed that the peak air flow rate was correlating well with height and weight in males. Conclusions: Speech language pathologist should consider peak expiratory airflow, a short sharp exhalation rate as a part of routine aerodynamic evaluation which is easier as compared to the otherwise commonly used measure, the vital capacity. Key words: Peak expiratory flow rate, Height, Weight, Body mass Index, peak flow meter INTRODUCTION respiratory measure and is an effective Owing to the technological measure of effort dependent airflow. It is the advancement over the past 30 years, the most commonly used to monitor the lung respiratory function testing has gained function. [‎1] Peak expiratory flow rate can be momentum as a clinical measure and is defined as the highest flow rate sustained by presently considered as an essential an individual for at least ten seconds. [‎2] prerequisite to diagnose various obstructive Spirometry is the widely used and restrictive disorders of the respiratory screening test for lung function. Invariably, system. the measurement of peak expiratory air flow Respiratory function is measured by is generally carried out using sophisticated aerodynamic analysis of voice. This spirometer using forced vital capacity measurement involves changes with respect maneuver in clinical setup. At home, the to the air volume, airflow and air pressure. participants with chronic air flow Peak Expiratory Flow Rate is a widely used obstruction who carry out their Peak International Journal of Health Sciences & Research (www.ijhsr.org) 240 Vol.5; Issue: 2; February 2015 expiratory air flow measurement usually do glottal aerodynamic input power, acoustic so by using peak flow meters. The peak flow output power and glottal efficiency), and meter is one of the means of objectively velocity of articulation (registration of assessing and monitoring the airway adduction, Abduction rate of the glottis, function. A peak flow meter is a small hand- tongue or the velum as movements per held device that measures how fast a person second). can blow air out of the lungs when there is The peak expiratory flow rate forceful exhalation, after maximum basically provides information regarding the inhalation. The peak flow meter helps to force of the contraction of the expiratory assess the airflow through the airways and muscles of respiration. Peak expiratory flow thus helps to determine the degree of rate has been well correlated to maximum obstruction along them. expiratory pressure which is a representation The measurement of peak expiratory of respiratory muscle strength. [‎3] The higher flow rate was pioneered by Wright who the value, the stronger and more sudden is produced the first meter specifically the contraction of expiratory muscles of designed to measure this index of lung respiration. The peak expiratory flow is function. Since the original design was measured in ml/second. In an individual introduced in the late 1950s, a more whose lungs have not been affected by any portable, lower-cost‎ version,‎ the‎ ‘Mini- pathological condition, the factors affecting Wright’‎ peak‎ flow‎ meters‎ have‎ become‎ peak expiratory flow rate are the dimensions available these days across the world. of the large intra and extrathoracic airways, Certain softwares are also available for the [‎4] the force generated by the expiratory measurement of respiratory function. The muscles, the speed with which maximal clinical significance of airflow, volume and alveolar pressure is reached, [‎5] and how the pressure has been well documented in lung was stretched prior to the Peak research. The instrument Aerophone II expiratory flow rate manoeuvre. There is (Manufacturer: F.J. Electronics, Ellebuen 3 also research evidence that exercise training DK-290), offers a practical recording and increases the peak expiratory flow rate analysing system for airflow measurements. because of an increase in respiratory muscle It takes the advantage of a sophisticated strength. The Peak expiratory flow rate is an combination of a hardware transducer effort dependent parameter emerging from system with transducers recording the the large airways within about 100–120 ms aerodynamic signal, and a computerised data of the start of the forced expiration. [‎6] Peak processing. The aerophone II includes the flow rate is higher in physically fit or, measurements of respiratory parameters healthier population such as Armed forces (peak flow, vital capacity, forced 1 second personnel and Athletes. [‎7] expiration and duration), sustained Need for the study phonation parameters(minimum, maximum The measurement of peak expiratory and average sound pressure level, dynamic flow rate is useful in the clinical assessment range, volume of air used, mean flow rate, of airway obstruction. It is one of many tests phonation duration and quotient), speech that measure how well airways are parameters (sound pressure level, air functioning. Speech language pathologists pressure and airflow during running speech usually consider vital capacity as a sole and duration),voice parameters(voice range measure in the evaluation of respiratory profile), voice efficiency parametres function. The research focus on the peak (subglottal pressure, glottal resistance, airflow as an aerodynamic measure in Indian International Journal of Health Sciences & Research (www.ijhsr.org) 241 Vol.5; Issue: 2; February 2015 scenario is sparse. There have been no Manufacturer: F.J. Electronics, Ellebuen 3 reports of studies on peak expiratory flow DK-290, Denmark. rate for Indian population using Aerophone Procedure: The test procedure was II analyser. Hence, this investigation was explained to the participants and a undertaken with an objective of determining demonstration of maneuver was given to peak expiratory flow rate in Indian young each of them. The participants were asked to adults. remain in relaxed seated position. The The aim of the current study was to participants were asked to hold the peak study the peak flow as an aerodynamic flow meter horizontal to their mouth, take in measure in healthy individuals with a deep breath, make a tight seal with their objectives to study peak air flow rate lips around the mouth tube, and asked to measure range in young healthy adults, to blow out as hard and fast as they could in determine the effect of height, weight and one breath. They were requested to take a body mass index on peak air flow rate and to deep breath and exhale as forcefully as compare across the gender. possible in one single blow into the instrument. A short sharp breath was MATERIALS AND METHODS instructed rather than a prolonged forceful This study was conducted in a breath. Two satisfactory readings were taken multidisciplinary hospital and was approved and highest of the two was taken for further by the Institutional Ethical Committee. The analysis. The obtained data was analysed study followed a cross sectional design with with SPSS software. convenient sampling. Participants: The participants were divided RESULTS into 2 groups. Group 1 consisted of n=30 In the present study, peak airflow young males in the age range of 18- 22 was investigated in young males and years. Group 2 consisted of n=30 young females and was correlated with respect to females in the age range of 18 to 22 years. their height and weight. Descriptive The mean age of the male participants was statistics were employed to find out mean 21.3 (± 1.09) years and the mean age of the and standard deviation of peak airflow female participants was20.27 (±1.015) measure. It was observed that peak airflow years. All participants were free of was higher in females as compared to that of cardiovascular disease, diabetes, cancer, males. There was significant difference respiratory diseases, smoking and any observed between the two groups at surgery/ skeletal abnormality likely to affect p<0.001. In the present study, the lung functions. The anthropometric participants were divided into 2 groups for measurements such as height, weight and height (140-165 centimeters; 166- Body Mass Index (BMI) was calculated for 190centimetres) and weight (40-70 all the participants. Body Mass Index
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