Thesis - Instituto de Telecomunicações

3.4. MATERIALS AND METHODS 51Figure 3.10: Example of Electrocardiograph signal collected over a 10 seconds interval.(b) respiration cycles [175, 165] - the ECG can be used to compute the respiration cyclethat has been coined as ECG derived respiratory signal (EDR);(c) calories consumption - it can be used to estimate the calories spent during exercise [18].3.4 Materials and Methods3.4.1 ParticipantsFor the study we invited graduate students from several schools of Instituto Politécnico deSetúbal, via direct recruitment and by requesting these students to invite their colleagues.The subjects were informed of the Uniform Resource Locator (URL) of the project portaland that they should schedule a date and time for the execution of the tests, within theempty slots of the acquisition schedule, presented on the project web page.Acquisition sessions occurred during the two week period from November 28, 2005 toDecember 9, 2005, at the Engineering School of Instituto Politécnico de Setúbal (IPS).We performed 2 preparatory tests to gain some local experience with the setup, the roomdisposition and the sets of tests. Additional adjustments were performed to the tests. We