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. 2015 Apr 15;3(4):e12305. doi: 10.14814/phy2.12305

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© 2015 The Authors. Physiological Reports published by Wiley Periodicals, Inc. on behalf of the American Physiological Society and The Physiological Society.

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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The effects of maternal age on spontaneous uterine contractions in laboring rats. (A) Represents recordings of spontaneous uterine contractile activity in a YOUNG (top trace) and OLDER (bottom trace) rat dam. B, C, and D are different measures of contractile activity in the myometrium of YOUNG (n = 4) and OLDER (n = 7) rats where (B) Represents 5 min integral activity, (C) Mean amplitude of contraction, and (D) 5 min contraction rate. Data were analyzed by one way ANOVA and significant differences between maternal age were determined at the P < 0.05 level. Statistical analysis revealed that spontaneous integral activity and contraction rate was significantly greater in myometrial strips of YOUNG compared to OLDER rats, with values of P < 0.03 and P < 0.05, respectively. Although the mean amplitude of spontaneous contractions was also higher in YOUNG animals versus their OLDER counterparts, it did not reach significance with P = 0.057.