Curious about amount of calories burnt during my weight lifting routines.?

July 29th, 2010 admin

Question by weights199217: Curious about amount of calories burnt during my weight lifting routines.?

I just need a educated estimate of calories burnt during a 45-55 minute medium to high intensity workout. Im sure my weight factor helps so ill tell you i weight 155 lbs. Also im 15 if that does anything.

Thanks in advanced

Best answer:

Answer by silverbullet
Absolutely no way of putting a number on it.

More than watching TV, less than running for the same amount of time.

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Note to Jim: In this case, misleading and not terribly relevant. It doesn’t take into account the questioner’s mechanical or digestive efficiency, and your formulas reference calories, not kilocalories (Calories with a capital “C”) , which are the unit of measure generally used in the context of exercise and diet.

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Posted in weight lifting routines Tags: About, amount, burnt, Calories, Curious, during, Lifting, Routines, weight

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One Response to “Curious about amount of calories burnt during my weight lifting routines.?”

1. jim_d_grady says:

   July 29, 2010 at 5:48 am

   The number of calories exerted to move any weight can be estimated using the formulas for work and force along with a few simplifying assumptions.

   Work is measured in joules. 1 joule is equal to about 0.239 calories. By calculating the work required to lift the weight, you can calculate the number of calories required to do that work.

   work (joules) = force (newtons) * displacement (meters). This equation assumes that you lift all of the (free) weight straight up. No machines, no pulleys, etc.
   force (newtons) = mass (kg) * change in velocity/time (m/sec/sec)

   There are 2.2 pounds in a kilogram, so 100 pounds is about 45.45 kgs. If you move 100 pounds (45.45kg) 1 meter in one second, use the joules to calories conversion and do 10 reps you would exert 109 calories as shown below:

   45.45kg * 1m/sec/sec* 0.239calories/joule * 10 reps = 109 calories

   If you move half the weight in twice the time over the same distance -
   22.72kg * 1/2m/sec/sec * 0.239 calories/joule * 10 reps = 27 calories

   If you are doing bicep curls you might move 25 pounds (11.4kg) about 1 foot (.3m) in 2 seconds
   11.4kg*.3/2 m/sec/sec * .239calories/joule * 10 reps = 4 calories

   If you squat 220 pounds and moved the weight about 16 inches (.4m) in 4 seconds
   100kg * .4/4 m/sec/sec * .239 calories/joule * 10 reps = 24 calories

   Your body weight should be included in the weight you lift, over the distance that you lift it. Other than that, your body weight doesn’t matter.