generally, humans use 1.3 calories per hour/per pound of body weight -based on the amp/ohm ratios -amp being motion, ohm the resistance. A 200 pound male should burn 252 Calories per hour on average. During a string workout, it should double.
You should burn more if you are moving faster as there is more amplitude and resistance. But if you jump rope fast, it would have the same effect...essentially. James.