Feasibility of WB-EMS in Frail Older People

"Whole-Body Electromyostimulation (WB-EMS): Simultaneous, individually adjustable stimulation of 12 muscle groups using an interval approach with a duty cycle of 6s impulse/4s rest, bipolar electric current (impulse -frequency 85Hz, -width 350μs, rectangular pattern) will be applied.~After a 4-week conditioning period, 1.5x 20 min/week WB-EMS will be conducted for 4 weeks (total training duration 8 weeks). Easy to perform functional exercises focusing on balance, transfer ability, stepping and lower extremity strength/power will be done during WB-EMS. Exercise intensity will be individually prescribed and adjusted by rate of perceived exertion (RPE-Borg CR10 scale 4 (moderate) to 7 (hard)).~WB-EMS will be fully supervised one on one.~All three arms will receive the same intervention."