Morning or evening walk? study finds best time to exercise for gestational diabetes

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Eligibility Criteria * Singleton, viable pregnancy with low suspicion for clinically significant abnormality or aneuploidy * Age 18-40 years (at recruitment) * Comfortable communicating with study staff in English and completing study surveys in English (i.e., no translator needed) * Identified as Gestational Glucose Intolerance (GGI) and a 3-hr 100g OGTT for Gestational Diabetes Mellitus (GDM) performed ≥ 24 weeks (i.e., GGI or GDM), or GDM by the one step procedure or a 1-hr 50-g glucose challenge test (GCT) ≥ 180 mg/dl performed ≥ 24 weeks Identification of GGI 1-hr 50-g GCT (non-fasting), with plasma glucose at 1-hr ≥ 130 mg/dL Identification of GDM by the two-step procedure Identified as GGI, followed by a 3-hr 100g OGTT at ≥ 24 weeks after an overnight fast, with at least two of four plasma glucose values meeting or exceeding: * Fasting: 95 mg/dL * 1-hr: 180 mg/dL * 2-hr: 155 mg/dL * 3-hr: 140 mg/dl Identification of GDM by the one-step procedure 75-g OGTT at ≥ 24 weeks after an overnight fast, with at least one plasma glucose value meeting or exceeding: * Fasting: 92 mg/dL * 1-hr: 180 mg/dL * 2-hr: 153 mg/dL Identification of GDM by 1-hr 50-g GCT 1-hr 50-g GLT (non-fasting), with plasma glucose at 1-hr ≥ 180 mg/dL at ≥ 24 weeks Exclusion Criteria * Indication that physical activity is or should be limited in the current pregnancy * Previously diagnosed with diabetes (i.e., Type I or Type II diabetes) outside of pregnancy * Current use of daily medications known to alter insulin resistance and/or metabolic profiles (e.g., metformin, corticosteroids, anti-psychotics) * Current use of medication for polycystic ovarian syndrome (PCOS) (i.e., history of PCOS okay as long as she is not currently taking medication for PCOS) * Condition or circumstance that would preclude their ability to follow a strict, time-based study protocol (e.g., psychiatric illness).