In a study of the effects of low-intensity exercise training with electrical stimulation, miyamoto, Kamada and Tamaki investigated muscle strength and cardiopulmonary health in healthy people (miyamoto, Kamada and Tamaki, 2016).They selected 19 healthy people in two groups: a control group and an intervention group.Participants in both groups maintained regular physical activity, while the intervention group received 30 minutes of electrical skeletal muscle (b-ses) training three to four METs over four weeks.The met, or metabolic equivalent only, is a physiological measure that expresses the energy cost of physical activity and is defined as the ratio of metabolic rate (hence the rate of energy consumption) to a specific metabolic rate of physical activity, conventionally set at 3.5 ml O2· kg −1· min −1(metabolic equivalent,2108).

References:

Metabolic equivalent.     (2108, July 12). Retrieved from Wikipedia:     https://en.wikipedia.org/wiki/Metabolic_equivalent

Miyamoto, T., Kamada, H.,     & Tamaki, A. (2016). Low-intensity electrical muscle stimulation     induces significaant increases in muscle strength and cardiorespiratory     fitness. European Journa of Sport Science , 1104-1110.