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The presented data acquisition system allows recording of electrohysterographic signals from maternal abdomen and the mechanical contractions via strain gauge transducer. As a research material we collected 108 traces during 24-hour period before labour from the group of patients between 37 and 40 week of gestation. That enabled the detection of contractions in the both signals and comparison of their descriptive parameters. Obtained results shows that these methods demonstrate high agreement only in relation to the number of contractions recognized as being consistent. But, the agreement of detailed contractions parameters is unacceptable to consider these methods as fully alternative.