Participants receiving Functional electrical stimulation (FES) combined with therapeutic exercise (TE)

Participants receiving only therapeutic exercise

Healthy adults (reference group REF) that participate only in 1 session and receive FES and therapeutic exercise

Healthy adults that participate only in 1 session and receive only therapeutic exercise

Group receive FES+therapeutic exercise during 6 weeks (twice a week). Altogether 8 exercises are conducted, each done 3 sets and 12 repetitions during first three weeks and 4 sets during last three weeks of intervention).

Change of MPF and A is measured after first therapy to assess the baseline values and then after 6 weeks of therapy to assess the effectiveness of intervention.

Muscle oscillation frequency (MOF) is measured to assess muscle tone. Change of MOF is measured after first therapy to assess the baseline values and then after 6 weeks of therapy to assess the effectiveness of intervention.

Sitting balance is measured using Tekscan Conformat pressure mat. Static sitting balance is measured at a custom made stool, hands are placed on participants thighs. For dynamic sitting balance, participants are asked to move their center of pressure to 4 different directions. Distance is measured.