Barr, S. I., Janelle, K. C., & Prior, J. C. (1995). Energy intakes are higher during the luteal phase of ovulatory menstrual cycles. The American Journal of Clinical Nutrition, 61(1), 39-43. https://doi.org/10.1093/ajcn/61.1.39
Barr SI, Janelle KC, Prior JC. Energy intakes are higher during the luteal phase of ovulatory menstrual cycles. Am J Clin Nutr. 1995;61(1):39-43. doi:10.1093/ajcn/61.1.39
Barr, S. I., et al. "Energy intakes are higher during the luteal phase of ovulatory menstrual cycles." The American Journal of Clinical Nutrition, vol. 61, no. 1, 1995, pp. 39-43.
For EndNote, Zotero or Mendeley:
License
Open-access status not yet checked.
Author affiliations
1 institution
Vancouver Hospital and Health Sciences Centre05p83my93
Linked to ROR, the Research Organization Registry
RRM Academy Synopsis
Energy intake was higher in the luteal phase of ovulatory cycles
Energy intake was higher in the luteal phase of cycles in which women ovulated, a 1995 observational study of 42 women with regular cycles reports. The luteal phase follows ovulation. Intake did not differ across the cycle in the 13 women whose late diet record came from a cycle with no ovulation, or from before a short luteal phase began.
Key Findings
Over six consecutive cycles, the 42 women recorded basal body temperature daily and kept 3-day diet records near the start, middle and end of different cycles.
For 29 women the late diet record fell in an ovulatory cycle's luteal phase; for 13, in a cycle with no ovulation or before a short luteal phase began.
In those 29 women, energy intake averaged 9.27 +/- 2.69 megajoules per day (MJ/d) in the luteal phase and 8.01 +/- 2.36 MJ/d in the follicular phase (P < 0.0001).
In the 13 other women, intake did not differ significantly across the cycle (7.91 +/- 2.18 versus 8.20 +/- 1.48 MJ/d).
Macronutrient intakes in both groups were similar between the early-cycle and late-cycle diet records.
Interpretation
The synopsis draws on the published abstract alone. The design is observational, meaning the women recorded their cycles and diets as they occurred. The 42 women were participants in a study of how often ovulatory disturbances occur among regularly cycling vegetarians and nonvegetarians. A quantitative analysis of each temperature chart showed whether the cycle was ovulatory and, if so, when its luteal phase began. The team then matched the early and late diet records to those results. Energy intake is reported in megajoules per day, a metric unit of energy. The authors conclude that studies of energy intake in women before menopause need to document ovulation.
RRM Context
RRM treats the menstrual cycle as a vital sign, and a cycle chart records whether and when ovulation occurred. In this study of women with regular cycles, analysis of the temperature charts showed which late diet records fell in the luteal phase of an ovulatory cycle. A chart that dates each phase lets a couple and a clinician place findings that change across the cycle in their proper phase.
Our editorial summary of this paper, not the article's abstract.
Abstract
We compared energy and macronutrient intakes across the menstrual cycle in participants (n = 42) in a study that assessed the frequency of ovulatory disturbances in regularly cycling vegetarians and nonvegetarians. Women kept daily basal body temperature records for six consecutive menstrual cycles and provided 3-d diet records near the beginning, middle, and end of different cycles. On completion of the study, temperature records were quantitatively analyzed to determine whether cycles were ovulatory, and if so, the date the luteal phase began. Diet records kept near the beginning and end of cycles were matched with temperature analysis results, and women were grouped according to whether the end-of-cycle record was kept during the luteal phase of an ovulatory cycle (group 1, n = 29), or during an anovulatory cycle or before luteal phase onset of a short luteal phase cycle (group 2, n = 13). Group 1 had higher energy intakes during the luteal than during the follicular phase (9.27 +/- 2.69 vs 8.01 +/- 2.36 MJ/d, P < 0.0001), whereas intakes of group 2 did not differ across the cycle (7.91 +/- 2.18 vs 8.20 +/- 1.48 MJ/d, NS). Both groups' macronutrient intakes were similar in records kept near the beginning and end of cycles. Documentation of ovulation is necessary in studies assessing premenopausal women's energy intakes.
05p83my93 