I suspect that Sparkpeople may calculate your calories burned with a formula that includes your weight. The less you weigh the fewer calories you burn. The Nordic may base calories burned on an average person that weighs more than you do.
Fitness Minutes: (14,252)
9,661 7/27/13 5:03 P
Cardio machines are prone to overestimating; how long were you on the machine?
Fitness Minutes: (55,048)
216 7/27/13 2:48 P
You should get a Fitbit device. Your height, age, and weight are put in and it gives you a more accurate calories burned calculation.
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