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Lab plan • Apparatus • Activation properties – Amplitude, frequency • Mechanical properties – Length, velocity Load cell • Strain gage – R=r l/a – Proportional to length, inverse to area • Load cell – Deform under specific load – Wheatstone bridge • R1 & R2 on opposing faces R1 Vi R3 Vo R2 R4 Anatomy Rostral Dorsal Caudal Ventral Medial Lateral Anatomy • Muscles – – – – Gasctrocnemius Anterior tibialis Vasti Hamstrings • Nerve – Sciatic/femoral Stimulation Stimulus voltage • Pulse – Width – Frequency • Train Stimulus voltage – Duration – Rate 1.0 0.8 0.6 0.4 0.2 0 0 1 2 3 Time (ms) 4 5 1000 1200 1.0 0.8 0.6 0.4 0.2 00 200 400 600 800 Time (ms) Force • Twitch – Time to peak tension – Relaxation time • Tetanus – TtPT – RT – Sag Things to watch for • Muscle – Damage – Length • Nerve – Damage – Desiccation • Compliance – Tendon, Suture – Limb, force transducer motion