John is a 38-year-old archeologist whose job requires some walking and hiking wh

Question

John is a 38-year-old archeologist whose job requires some walking and hiking when he is collecting data in the field. However, much of his time is spent analyzing artifacts in the laboratory and writing research reports in his office. He is thinking about joining the employee fitness program at work, and therefore contacted you to evaluate his health risk and aerobic fitness level. His last medical examination was 3 months ago. You gave him a GXT using a Bodyguard cycle ergometer and collected the following data: Client: 38-year-old male Resting BP: 131/92 mmHg Resting HR: 71 bpm Total cholesterol: 210 mg · dl-1 Height: 5 ft 10 in. (177.8 cm) HDL-cholesterol: 30 mg · dl-1 Body weight: 180.8 lb (82 kg) Smoking history: 1 pack per day Activity interests: cycling Physical activity: job-related walking/hiking GXT Data Stage Min Work rate (kgm · min-1) HR BP RPE 1 1 180 110 2 180 115 3 180 119 168/92 7 2 4 360 130 5 360 136 6 360 138 180/90 13 3 7 540 151 8 540 158 9 540 163 215/88 16

11. How long will he need to cycle at the minimum exercise intensity (in METs) in order to expend 100 kcal during the aerobic workout?

Explanation / Answer

Minimum exercise intensity (in METs) can be defined as the unit to describe ennergy expenditure/ amount of oxygen consumed by the body at rest. The literature value for a body sitting at rest is  3.5 ml O2 per kg body weight min-1.

John's weight in pounds = 180.8lb= 82 kg (divide body weight in pounds by 2.2 to convert into kg)

Let us suggest an workout of 1 hr = 60 mins

if 100 kcal(100,000 calories) should be burnt in 60 mins, then in 1 min ?

100,000/60= 1666.6 = 16667 calories.

The formula to be used is:

(MET X 3.5 X body weight (in kg) )/ 200 = calories burned per minute.

Let MET value be x

=> (x * 3.5*82)/200 = 1667calories per minute

=>  (x * 3.5*82) = 20 * 1667 calories per minute

=> 287 x = 20 * 1667 calories per minute

=> x = (20 * 1667)/287 calories per minute

=> x = 116.1 = 116 METs

Thus, if John plans to loose 100kcal in one aerobic workout, taken into consideration that the workout is for 1 hr, then it will be 116 MET.

The MET value of 2 means, that the you must spend an energy twice of what you consume while sitting at rest.

A MET of 116 means, John would have to spend an energy 116x times of what he consumes while sitting(i.e 3.5 ml O2 per kg body weight min-1).

Given that the bp for John is little high, the working intensity should be reduced.

We have calculated the MET if John works for an hr/60 mins.

1 MET is = 3 MET mins

Lets consider 2 MET of 30 mins workout each day, the amount of calories burnt per minute will be:

(MET X 3.5 X body weight (in kg) )/ 200 = calories burned per minute.

(14 X 3.5 X 82)/200 = x calories burnt per minute

Therefore,20 calories per minute shall be burnt with an MET of 14( 14 X 3= 42 MET mins)

42 MET mins X 30 minutes = 1260 MET mins per day, for 6 days = 7560 MET mins for 6 days

7560 MET mins per day X 20 calories per minute = 105,840 calories= 105 kcal (approximately to what John needs to shed)

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