The goal of this clinical trial is to examine the effect of whole-body electrostimulation with protein intake on muscle protein synthesis, muscle mass and function during bed rest in healthy young adults (18-35 years). The main questions to answer are:
* Does whole-body NMES followed by protein intake improve muscle protein synthesis rates during 3 days of bed rest?
* Does repeated NMES sessions offer protective effects on muscle mass and function during extended periods of inactivity?
Researchers will compare sham electrical electrostimulation, electrical stimulation and electrical stimulation + protein groups to see if whole-body electrostimulation combined with protein intake offers the greatest improvement in muscle protein metabolism and muscle preservation.
Participants will:
* Undergo 3 days of bed rest while receiving one of the following interventions:
* Sham-NMES followed by standard nutrition (CON)
* Whole-body NMES followed by standard nutrition(NMES)
* Whole-body NMES followed by a bolus of 20g protein (NMES+PRO)
* Receive heavy water (D2O) to assess body water turnover.
* Undergo leg extension exercises to assess muscle function.
* Have quadriceps muscle thickness measured via ultrasound.
* Provide saliva samples for analysis.
* Have calf circumference measured to monitor changes in muscle mass.