Effects of Electrical Stimulation and Vitamin D Supplementation on Bone Health Following Spinal Cord Injury.

Inclusion Criteria: To be included, participants will have to: * Be 18-65 years of age * Have history of traumatic SCI ( 1-year) with NLI of C8-T10 and AIS A or B (confirmed by AIS examination performed by PI or a qualified Provider * Have a caregiver who is available and willing to be trained to apply intervention protocol in the home (placing weights and positioning the Veteran) throughout study duration * Be a wheelchair user for primary mode of mobility * Have Knee extensors that must respond to standard surface electrical stimulation procedures (stimulation frequency procedures, 30 Hz; pulse duration:1 ms and amplitude of the current of less than200 mA) * Be able to receive written clearance from their medical Providers to ensure safety of participants * Be a Veteran (male or female), however, the Department of Veteran Affairs has limited number of female Veterans, especially those with motor complete injury at level C8-T10 (currently, there are only 3 female Veterans with the target NLI in our SCI registry). Hence, inclusion of women Veterans may be challenging due to this disparity in the SCI population. If we fail to recruit 20 Veterans, we may seek an IRB approval to recruit non-Veterans to meet our target sample size * Have normal ECG * Commit to undergo 9 months of trial; 4.5 months of open-kinematic chain resistance training followed by 4.5 months of closed-kinematic chain using simple rowing approach + Vit. D supplementation (Experimental group) or 9 months of …