Issn Print: 0195-9131
Publication Date: 1996/05/01
TRAINING VOLUME DURING PREGNANCY - EFFECT ON FETAL HEART RATE RESPONSE, MATERNAL WEIGHT GAIN, AND FAT DEPOSITION 354
J. F. Clapp; J. Tomaselli; S. Appleby-Wineberg; S. E. Ridzon; B. Lopez; C. Cowap; K. D. Little
Excerpt
This study was designed to test the hypothesis that weekly training volume is a major determinant of the impact of regular antigravitational exercise on fetal heart rate (FH), maternal weight gain (WG), and subcutaneous fat deposition (SFD). At 8 weeks gestation, women were randomized to perform sustained antigravitational exercise at 55% of VO2max for either: 20 minutes 3-5 x week (LEX), 40 min. 5 x week (HEX); or 20 min. 5 x week in early pregnancy & 60 min. 5 x week after the 24th week (LHEX). The relationship between maternal heart rate & exercise VO2 was assessed every two weeks and WG and 5 site skinfold thicknesses (SF) every 4 weeks. Training sessions were monitored and the FH counted for 30 seconds before & after exercise using doppler. FH data obtained during fetal motion was deleted. In all groups, the pre-training FH fell as gestation advanced. In LEX, the post-training FH rose 5-6 bpm in early pregnancy increasing to 8-10 bpm after the 24th week. In HEX, the post-training FH rose 7-11 bpm in early pregnancy increasing to 14-20 bpm after the 24th week. In LHEX, the post-training FH response was similar to LEX before the 24th week and similar to HEX thereafter. Changes in WG & SF in HEX & LHEX were similar and significantly less than those in LEX(13.5 ± 1.3 kg vs 17.4 ±.9 kg & 10 ± 6 mm vs 26± 5 mm). We conclude that both the duration of intensity controlled exercise & gestational age increase the FH response and that training volume has time-specific effects on WG & SFD.
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