ࡱ> 7 :bjbjUU %7|7|6l00080$0`f222"222)4)4)4eeeeeee$g inf)44")4)4)4f6229f666)422e6)4e66<fZp]22 `f,06C]D]0f0`f]D j6 j]6RESPIRATORY RESPONSES TO CHANGES IN POSTURE AND TO EXERCISE (Martini p.850-852, 861-865) Work in groups of 4 Objectives: Define tidal volume (TV), inspiratory reserve volume (IRV), expiratory reserve volume (ERV), vital capacity (VC), residual volume (RV), total lung capacity (TLC) and respiratory rate Describe how these respiratory variables change with exercise, and account for the changes observed NOTE: one student is the subject, the second determines volumes, the third is the timer and determines respiratory frequencies and the fourth records the values and does the calculations. Record results in the space provided. I. PROCEDURE TO DETERMINING STANDARD RESPIRATORY VOLUMES A. Using The Spirometer Examine the spirometer to determine how it works. It consists of two cylinders, each of which is closed at one end and open at the other. The air hose is connected to a tube which runs in to the center of the outer cylinder at the bottom end, and then upwards in the center. The outer cylinder (spirometer body) is filled with water to within 3 or 4 cm of the top. The inner cylinder (spirometer bell) is positioned with the closed end up and the open end floating in the water. It contains air. A chain attached to the middle of its upper surface runs up over a calibrated pulley wheel, then down to where it is attached to a counter-weight within a tube on the outside of the outer cylinder. Exhaling increases the volume of air and raises the inner cylinder. The pulley wheel turns clockwise. The free-swinging pointer mounted in the center of the wheel should be set on the upper side of the fixed pin on its periphery. Adjust the position of the wheel by raising the weight and allowing the chain to slip around the pulley wheel as you turn it. Allow the bell to float freely again, and note the position of the pointer. It should point to a value just above 0 on the scale. The scale is graduated in liters and 0.l liters. Practice using the spirometer while standing comfortably beside it. Obtain a CLEAN disposable mouthpiece, attach it to the end of the air hose. You can breathe into the spirometer in two ways (use the method which allows you to breathe most comfortably). Place the mouthpiece up to your mouth, making sure that there is a good seal and air wont leak out around it. Breathe through your nose several times, then inhale through your nose, pinch your nose shut and exhale through the mouthpiece into the spirometer. DO NOT INHALE THROUGH THE MOUTHPIECE. Rather, release your fingers from your nose and inhale through it. Practice doing this until you become accustomed to the sequence. To determine the volume of air exhaled, note the dial readings at the beginning and end of exhalation, and subtract the initial from the final volume. Allow the disc to return to its initial position by removing the mouthpiece from your mouth (or opening your mouth around it). Using the second method, only place the mouthpiece up to your mouth when you exhale. Inhale normally without the mouthpiece, pinch your nose shut and place the mouthpiece up to your mouth when you exhale (forming a good seal around the mouthpiece). Between breaths the disc will return to its initial position when you remove the mouthpiece from your mouth. The subject counts the number of exhalations in a 60 second period timed by her partner. Make several counts until the result is consistent; this will indicate if you are breathing comfortably with the spirometer. Try counting while breathing freely, and while holding the spirometer in your mouth and breathing through the nose - the results should be the same. Resting Respiratory Rate (breaths/min)1st2nd3rdBreathing freelyBreathing with the spirometer Make several records of the amount of air exhaled in quiet breathing, repeating until your results are consistent. If the value exceeds 0.5 liters (500 ml) consistently, you are probably blowing into the apparatus; practice breathing with a normal rhythm. 1st2nd3rdVolume of air exhaled (mL) B. Determination of Resting Respiratory Rates EXERCISE A Equipment: stopwatch The subject counts the number of exhalations in a 60 second period timed by her partner. Make 3 counts of Respiratory Rate while standing quietly. Count for 60 seconds each time and average. Record your results below. 1st2nd3rdAverageResting Respiratory Rate (breaths/min) C. Determination of Standard Volume Respiratory volumes and capacities will be measured using the spirometer (except total lung capacity and residual volume - determination of these values requires more sophisticated techniques). Do all determinations with the subject standing erect beside the apparatus, but in a position where she cannot watch the dial. Readings are noted by the operator to the nearest 0.05L or 50mL. In all tests (except inspiratory reserve volume) exhaled volumes only are measured. The spirometer should be permitted to return to near 0 between each reading. Note: Air expands when heated and contracts when cooled. The volumes determined in the spirometer, which is at room temperature, are smaller than they would be at body temperature (37(C) and must be corrected to be representative of volumes in the lungs. Table 1 lists the correction factors by which the raw data must be multiplied to get the true volumes for body temperature. Table 1. Correction Factors for Converting Spirometer Volumes to Body Temperature. Spirometer Temperature (OC)Correction FactorSpirometer Temperature (OC)Correction Factor151.130231.085161.124241.08171.118251.075181.113261.068191.107271.063201.102281.057211.096291.045221.091301.039 These correction factors must be applied to all volumes determined using the spirometer. Select the appropriate factor and correct average for your standard volumes. Determine the temperature of the spirometer = (C. EXERCISE B Equipment: spirometer with disposable mouthpieces TIDAL VOLUME: (TV) Make 3 separate determinations while maintaining normal quiet breathing rhythm. Inhale and exhale through the nose several times. When you feel ready, exhale through mouth without forcing it and remove the mouthpiece. Repeat if the determinations are not within 0.l liters of each other. Resting TV (ml) 1st2nd3rdAverageCorrected value EXPIRATORY RESERVE VOLUME (ERV) Breathe normally in and out through the nose. At the end of a normal expiration pinch the nose closed and continue to blow out into the spirometer, emptying the lungs as completely as you can. Performance of this test often improves with practice. Rest between trials for a minute or two. Encouragement of the subject by the operator often helps ("Come on - Keep going - you can still blow out more"). Repeat several times until 3 consistently high values are obtained. Calculate mean, discarding initial values if they are not consistent with the rest. Resting ERV (ml) 1st2nd3rdAverageCorrected value INSPIRATORY RESERVE VOLUME (IRV) Before performing this test, remove the spirometer bell from the water and recharge it with fresh air. Adjust the dial of the spirometer to a high value, and subtract the final reading from the initial reading. The dial will turn counterclockwise during this test. Breathe normally in and out through the nose. At the end of a normal inspiration pinch the nose closed and inhale as much more air as possible through the mouthpiece. Note initial and final readings, subtract final from initial value, and record. This is the IRV. Repeat 3 times, with a rest between trials. Calculate the mean. Resting IRV (ml) 1st2nd3rdAverageCorrected value VITAL CAPACITY (VC) Readjust the spirometer pointer to near 0. Inhale as deeply as possible through the nose. Then pinch the nose closed and exhale into the mouthpiece as much as you can. Empty the lungs of air as completely as possible. Repeat 3 times. Record the largest value (NOT the mean). Test the consistency of your results. VC should equal TV + IRV + ERV. Measured Resting VC (ml) 1st2nd3rdLARGEST VALUECorrected value Predicted Measured Vital Capacity VC (ml): TV + IRV + ERV = Notes: Do not assume that these volumes should match exactly. Inconsistency is expected to be relatively large because the apparatus used is crude, and the results depend on voluntary efforts on the part of the subject. Vital capacity varies with sex, body size and age. Its value, based on data collected from large numbers of nonsmoking individuals living in a low pollution area, may be predicted as follows: Men: Predicted VC = 0.121 H  0.0136 A  3.18 Women: Predicted VC = 0.078 H  0.0154 A  1.05 H = height in inches A = age in years Predicted VC in Liters Calculate the predicted vital capacity for your gender, height and age, and compare with the measured value (corrected). Measured values within + 20% of predicted values are considered to be normal. Predicted Vital Capacity (ml) = RESIDUAL VOLUME (RV) and TOTAL LUNG CAPACITY (TLC) Residual Volume and Total Lung Capacity cannot be determined with the spirometer because they consist of (or include) the volume of air that cannot be exhaled under any circumstances. However, these values can be roughly predicted for normal individuals using the factors listed in Table 2. Table 2. Factors for Estimating Residual Volume (RV) and Total Lung Capacity (TLC) from Vital Capacity (VC). For VC, use the value that you measured with the spirometer. AgeResidual Volume (RV)Total Lung Capacity (TLC)1634RV = VC x 0.250TLC = VC x 1.2503549RV = VC x 0.305TLC = VC x 1.3055069RV = VC x 0.445TLC = VC x 1.445 Calculate your predicted Residual Volume and Total Lung Capacity from your measured Vital Capacity. Predicted Residual volume (ml) = Predicted Total Lung Capacity (ml) = II. DETERMINATION of RESPIRATORY MINUTE VOLUME (VENTILATION, V) As activity levels increase the amount of oxygen that is transferred from the air in the lungs to the blood must increase. Ventilation (V) or respiratory minute volume (ml/min) is calculated by multiplying the respiratory rate (breaths per minute) by the tidal volume (ml per breath). A. Respiratory Minute Volume (V): Resting EXERCISE C Equipment: stopwatch spirometer with disposable mouthpieces With the subject standing quietly at ease, determine respiratory rate, counting for 60 seconds. During the count, place the spirometer mouthpiece in your mouth and exhale once into the spirometer to measure the tidal volume. Repeat this twice and record the values in the table below. Respiratory rates and volumes (standing)1st2nd3rdAverageRespiratory rate (60 sec)TV (ml)TV corrected (ml)Respiratory Minute Volume (V in ml/min)= (Rate x TV corrected) B. Respiratory Minute Volume (V): After Exercise The measurements recorded immediately after exercise illustrate what happens during exercise. EXERCISE D Equipment: stopwatch spirometer with disposable mouthpieces Perform moderate exercise (eg. running up and down the stairs) at a level that you can maintain for 5 minutes. Use the average respiratory rates and volumes determined in Exercise H as your pre-exercise values (first column of the table below). Immediately upon stopping exercise, determine tidal volume and the respiratory rate (30 sec count). Repeat these measurements at 2, 4 and 6 minutes after stopping exercise. Record all results in the table below. Respiratory measurementsbefore exercisingimmediately after exercise2 min after exercise4 min after exercise6 min after exerciseRespiratory Rate (30 Sec. count)Respiratory Rate per minuteTV (ml)TV (ml) corrected valuesRespiratory Minute Volume (ml/min) NAME & section #: ________________________________________ Biology 153 LAB REPORT (2003-2004) EXERCISE 5: RESPIRATORY RESPONSES TO EXERCISE INTRODUCTION State the purpose of this exercise MATERIALS AND METHODS See the lab manual. RESULTS. Use separate pages. RESPIRATORY EFFECTS OF POSTURE AND EXERCISE. 1. Tabulate your results: (do not forget to correct for temperature)  resting respiratory rate  resting TV  resting ERV  resting IRV  resting VC  predicted vital capacity (see lab manual)  predicted residual volume (see lab manual) - predicted total lung capacity (see lab manual) 2. Using your own data, make a diagram showing your subjects respiratory volumes and capacities to scale. See Seeley p. 834 as a guideline. 3. Make a second table showing:  respiratory rate, TV, Respiratory minute volume standing immediately (time 0 min), 2, 4, 6, minutes after exercise 3. Calculate the percentage increase in respiratory rate, tidal volume and respiratory minute volume at each time (0, 2, 4, and 6 minutes) following exercise as compared to control values (before exercise). Percentage increase = after exercise value before exercise value X 100% before exercise value Tabulate your calculations and plot them on a graph. Under the graph, describe your results in no more than 5 lines. DISCUSSION. Use the spaces provided below. Do not use extra pages. 1. Outline the pattern of ventilation increase during (=immediately after) exercise. What are the mechanisms responsible for these changes that occur both immediately upon starting exercise and throughout exercise? 2. Does ventilation return to pre-exercise levels immediately? Describe and explain the trend you observe in recovery immediately following exercise and then for the next 6 minutes. Consider what needs to be accomplished during recovery from exercise to return the body to pre-exercise conditions. 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