The 7th Ninapro database includes 20 intact subjects and 2 amputees recorded with 12 active double–differential wireless electrodes from a Delsys Trigno IM Wireless EMG system. The sensors comprise EMG electrodes and 9-axes inertial measurement units (IMUs).
The dataset is kindly provided by Agamemnon Krasoulis and Kianoush Nazarpour and it is thoroughly described in the paper: Improved prosthetic hand control with concurrent use of myoelectric and inertial measurements. Journal of NeuroEngineering and Rehabilitation, 2017" (http://jneuroengrehab.biomedcentral.com/articles/10.1186/s12984-017-0284-4). Please cite this paper for any work related to the 7th database.
More information about the protocol can be found in the original paper: "Manfredo Atzori, Arjan Gijsberts, Claudio Castellini, Barbara Caputo, Anne-Gabrielle Mittaz Hager, Simone Elsig, Giorgio Giatsidis, Franco Bassetto & Henning Müller. Electromyography data for non-invasive naturally-controlled robotic hand prostheses. Scientific Data, 2014" (http://www.nature.com/articles/sdata201453)