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LAB 5: BALKE TREADMILL PROTOCOL By: Keely Paxton Tyler Kybartas 3/12/2019

Statement of Purpose: The purpose of the Balke Treadmill Protocol was to determine an individual’s cardiorespiratory fitness level using a submaximal test. Heart rate, blood pressure, and RPE were measured every two minutes while the subject walked at a constant pace of 3 mph and a 2.5% grade increase every two minutes. It is important for us to practice taking these measurements because they will be frequently and commonly used later on. Results: Name: Keely Paxton

Pre-exercise HR: 124 bpm

Weight: 120 lbs. / 54.5 kg

Pre-exercise BP: 137/79 mmHg

Height: 64 in.

Post- exercise HR: 129 bpm

Age- predicted HR max: 198 bpm

Post- exercise BP: 139/89 mmHg

Time

Speed

(min)

(mph)

Grade %

METs

HR

BP

MAP

(bpm)

(SBP/DBP)

(mmHg)

RPE

(mmHg) 2

3

0

3.29

132

136/88

104

6

4

3

2.5

4.33

134

135/84

101

6

6

3

5

5.36

142

138/81

96.67

8

8

3

7.5

6.404

151

139/85

103

9

10

3

10

7.43

160

142/83

102.67

10

12

3

12.5

8.47

175

139/89

105.67

12

-! METs: [(0.1 * speed) + (1.8 * speed * grade) + 3.5] / 3.5 o! Speed = 3 mph * 26.8 = 80.4 m/min

o! 0 % grade: [(0.1 * 80.4 m/min) + (1.8 * 80.4 m/min * 0) + 3.5] / 3.5 = 3.29 METs o! 2.5 % grade: [(0.1 * 80.4 m/min) + (1.8 * 80.4 m/min * 2.5) + 3.5] / 3.5 = 4.33 METs -! MAP: DBP + 1/3 * (SBP-DBP) o! Minute 2: [88 + 1/3 * (136 – 88)] = 104 mmHg o! Minute 4: [84 + 1/3 * (135 – 84)] = 101 mmHg Discussion Questions:

1.!

2.!

3.!

o! Exact Max MET Level: X = 198-100 / 8.3319 = 11.76 4.! Two disadvantages of the Balke Treadmill test are that leg fatigue may settle in before actual body fatigue due to the incline, and an individual’s max level may be overestimated, if the subject finds the test too hard, or underestimated, if the subject finds the test too easy. In these cases, an individual’s MET value could be inaccurate, which could ultimately increase their risks and affect the way their progress is monitored. 5.! The main difference in the Balke and Bruce Treadmill protocols is just that they are simply two different tests. The Balke test is a submaximal exercise test, whereas the Bruce test is a maximal exercise test. This is why the METs in the Bruce Test appeared significantly higher and more intense than the Balke. In the Bruce test, the amount of time in each interval is longer and the grade increases are much more vigorous, whereas in the Balke test, the individual is walking at a constant speed with gradual increases in the grade. 6.! I think the Balke test would be more appropriate for a cardiac patient with a low maximum aerobic capacity, due to the smaller increments and because of the 1 MET increases between the stages. Using the Balke test would be the safer option with fewer risks and it would also provide more accurate results than the Bruce test would....