Table 1.
Participant characteristics by average past-week physical activity measured four times per cycle across ≤ 2 menstrual cycles (N=259 women)
| Average past-week physical activity*: Mean ± SD (min, max) n (column %) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
|
| |||||||||
| Participant characteristics | All (N=259†) | Lowest Tertile (median =10 MET-h/week) (n=86) | Middle Tertile (median = 25 MET-h/week) (n=85) | Highest Tertile (median = 66 MET-h/week) (n=88) | P-value‡ | ||||
| Age (years) | 27.3 ± 8.2 (18, 44) | 27.7 ± 7.8 (18, 44) | 27.6 ± 8.5 (18, 44) | 26.6 ± 8.4 (18, 44) | 0.53 | ||||
| Body mass index (kg/m2) | 24.1 ± 3.9 (16.1, 35.0) | 23.9 ± 4.1 (16.1, 34.5) | 24.5 ± 4.0 (18.4, 33.2) | 23.9 ± 3.5 (17.7, 35.0) | 0.78 | ||||
| Perceived stress score§ | 20.2 ± 6.8 (3.0, 44.0) | 21.0 ± 7.7 (5.0, 44.0) | 20.2 ± 6.4 (3.0, 34.0) | 19.4 ± 6.2 (6.0, 36.0) | 0.63 | ||||
| Race | |||||||||
| White | 154 (59.5) | 44 (51.2) | 50 (58.8) | 60 (68.2) | 0.23 | ||||
| African American | 51 (19.7) | 20 (23.3) | 16 (18.8) | 15 (17.0) | |||||
| Other race | 54 (20.8) | 22 (25.6) | 19 (22.4) | 13 (14.8) | |||||
| Education (highest grade completed) | |||||||||
| Post-secondary | 226 (87.3) | 74 (86.0) | 73 (85.9) | 79 (89.8) | 0.68 | ||||
| ≤ High school | 33 (12.7) | 12 (14.0) | 12 (14.1) | 9 (10.2) | |||||
| Marital status | |||||||||
| Single/divorced | 193 (74.5) | 62 (72.1) | 61 (71.8) | 70 (79.5) | 0.41 | ||||
| Married/living as married | 66 (25.5) | 24 (27.9) | 24 (28.2) | 18 (20.5) | |||||
| Smoking | |||||||||
| Nonsmoker | 249 (96.1) | 82 (95.3) | 84 (98.8) | 83 (94.3) | 0.36 | ||||
| Current smoker | 10 (3.9) | 4 (4.7) | 1 (1.2) | 5 (5.7) | |||||
| ≥1 Anovulatory cycle|| | 35 (14.0) | 10 (11.7) | 12 (14.1) | 13 (14.8) | 0.83 | ||||
| Habitual physical activity tertile¶ (median) | |||||||||
| Lowest (17 MET-h/week) | 86 (33.2) | 53 (61.6) | 23 (27.1) | 10 (11.4) | <0.001 | ||||
| Middle (56 MET-h/week) | 86 (33.2) | 24 (27.9) | 38 (44.7) | 24 (27.3) | |||||
| Highest (149 MET-h/week) | 87 (33.6) | 9 (10.5) | 24 (28.2) | 54 (61.4) | |||||
| Daily vigorous physical activity, average# (min) Dietary Variables Mean##(SD) | 14.6 ± 21.1 (0.0, 196.9) | 4.7 ± 4.8 (0.0, 18.5) | 13.0 ± 9.8 (0.0, 37.6) | 25.8 ± 31.3 (0.0, 196.9) | <0.001 | ||||
| Total caloric intake, kcal | 1608± 354 (793, 2686) | 1609± 394 (858, 2667) | 1647 ± 349 (848, 2686) | 1568 ± 316 (793, 2197) | 0.34 | ||||
| Total fat, g | 62.1 ± 18.5 (18.5, 133.9) | 62.4 ± 19.6 (32.0, 133.9) | 64.2 ± 20.5 (18.5, 120.7) | 60.0 ± 15.2 (23.2, 89.6) | 0.33 | ||||
| Total carbohydrate, g | 201.1 ± 49 (75.7, 330.3) | 202.5 ± 51.6 (75.7, 330.3) | 206.1 ± 45.1 (129.6, 312.4) | 195.0 ± 49.8 (95.8, 316.6) | 0.31 | ||||
| Total protein, g | 62.2 ± 15.6 (26.3, 132.1) | 61.1 ± 17.4 (31.3, 132.1) | 63.8 ± 15 (26.3, 99.7) | 61.7 ± 14.3 (28.5, 91.8) | 0.72 | ||||
BMI= body mass index; FSH= follicle-stimulating hormone; LH= luteinizing hormone; SD= standard deviation; MET= metabolic equivalent; h/week= hours per week; kcal= kilocalorie
Average past-week physical activity tertile cut-points across cycles were 17.4 and 38.3 MET-h/week.
250 women in the BioCycle Study were followed for 2 cycles, 9 women were followed for 1 cycle.
Two-sided P-values for continuous variables calculated using ANOVA and categorical variables using Fisher’s exact test.
Perceived stress score measured at baseline for 258 women.
Twenty-eight women in the study had only one anovulatory cycle and seven women in the study had two anovulatory cycles for a total of 35 women with at least one anovulatory cycle.
Habitual physical activity tertile cut-points were 35.1 and 83.3 MET-h/week.
Daily diary reports of minutes spent in vigorous activity were averaged across the study within-women.
Averaged over up to eight 24-hour dietary recalls conducted during the study.