TY - GEN N2 - Background: Prenatal exercise improves birth outcomes, but research into exercise dose–response effects is limited. Methods: This study is a retrospective, secondary analysis of pooled data from three blinded, prospective, randomized controlled trials. Prenatal exercise frequency, intensity, type, time, and volume (FITT-V) were assessed in supervised sessions throughout pregnancy. Gestational age (GA), neonatal resting heart rate (rHR), morphometrics (body circumferences, weight-to-length and ponderal index) Apgar and reflex scores, and placental measures were obtained at birth. Stepwise regressions and Pearson correlations determined associations between FITT-V and birth outcomes. Results: Prenatal exercise frequency reduces ponderal index (R2 = 0.15, F = 2.76, p = .05) and increased total number of reflexes present at birth (R2 = 0.24, F = 7.89, p < .001), while exercise intensity was related to greater gestational age and birth length (R2 = 0.08, F = 3.14; R2 = 0.12, F = 3.86, respectively; both p = .04); exercise weekly volume was associated with shorter hospital stay (R2 = 0.24, F = 4.73, p = .01). Furthermore, exercise type was associated with placenta size (R2 = 0.47, F = 3.51, p = .01). Conclusions: Prenatal exercise is positively related to birth and placental outcomes in a dose-dependent manner AB - Background: Prenatal exercise improves birth outcomes, but research into exercise dose–response effects is limited. Methods: This study is a retrospective, secondary analysis of pooled data from three blinded, prospective, randomized controlled trials. Prenatal exercise frequency, intensity, type, time, and volume (FITT-V) were assessed in supervised sessions throughout pregnancy. Gestational age (GA), neonatal resting heart rate (rHR), morphometrics (body circumferences, weight-to-length and ponderal index) Apgar and reflex scores, and placental measures were obtained at birth. Stepwise regressions and Pearson correlations determined associations between FITT-V and birth outcomes. Results: Prenatal exercise frequency reduces ponderal index (R2 = 0.15, F = 2.76, p = .05) and increased total number of reflexes present at birth (R2 = 0.24, F = 7.89, p < .001), while exercise intensity was related to greater gestational age and birth length (R2 = 0.08, F = 3.14; R2 = 0.12, F = 3.86, respectively; both p = .04); exercise weekly volume was associated with shorter hospital stay (R2 = 0.24, F = 4.73, p = .01). Furthermore, exercise type was associated with placenta size (R2 = 0.47, F = 3.51, p = .01). Conclusions: Prenatal exercise is positively related to birth and placental outcomes in a dose-dependent manner AD - East Carolina University AD - East Carolina University AD - East Carolina University AD - East Carolina University AD - East Carolina University AD - Illinois State University AD - University of Southern Indiana AD - East Carolina State University AD - East Carolina State University AD - East Carolina State University AD - East Carolina State University AD - East Carolina University AD - East Carolina University AD - West Virginia University AD - Boise State University T1 - Exercise FITT-V during pregnancy: Association with birth outcomes DA - 2024-04-24 AU - Claiborne, Alex AU - Wisseman, Breanna AU - Kern, Kara AU - Steen, Dylan AU - Jevtovic, Filip AU - McDonaild, Samantha AU - Strom, Cody AU - Newton, Edward AU - Isler, Christy AU - Devente, James AU - Mouro, Steven AU - Collier, David AU - Kuehn, Devon AU - Kelley, George A. AU - May, Linda E. L1 - https://library.usi.edu/record/1492417/files/Birth%20Defects%20Research%20-%202024%20-%20Claiborne%20-%20Exercise%20FITT%E2%80%90V%20during%20pregnancy%20%20Association%20with%20birth%20outcomes.pdf JF - Birthd Defects Research LA - eng PY - 2024-04-24 ID - 1492417 L4 - https://library.usi.edu/record/1492417/files/Birth%20Defects%20Research%20-%202024%20-%20Claiborne%20-%20Exercise%20FITT%E2%80%90V%20during%20pregnancy%20%20Association%20with%20birth%20outcomes.pdf KW - Apgar KW - birthweight KW - dose KW - placenta KW - ponderal index KW - prenatal exercise TI - Exercise FITT-V during pregnancy: Association with birth outcomes Y1 - 2024-04-24 L2 - https://library.usi.edu/record/1492417/files/Birth%20Defects%20Research%20-%202024%20-%20Claiborne%20-%20Exercise%20FITT%E2%80%90V%20during%20pregnancy%20%20Association%20with%20birth%20outcomes.pdf LK - https://library.usi.edu/record/1492417/files/Birth%20Defects%20Research%20-%202024%20-%20Claiborne%20-%20Exercise%20FITT%E2%80%90V%20during%20pregnancy%20%20Association%20with%20birth%20outcomes.pdf UR - https://library.usi.edu/record/1492417/files/Birth%20Defects%20Research%20-%202024%20-%20Claiborne%20-%20Exercise%20FITT%E2%80%90V%20during%20pregnancy%20%20Association%20with%20birth%20outcomes.pdf ER -