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Official Journal of the American College of Sports Medicine CSA of leg musculature in both males and females with males having a greater response in the quadriceps and hamstrings. 1165 Board #110 May 30, 8:00 AM - 9:30 AM Effects Of accelerometer-based Intervention To Go Beyond Physical activity reference For Japanese On The Prevalence Of Low-back Pain: a randomized Control Trial Motohiko Miyachi 1 , Haruka Murakami 1 , Ryoko Kawakami 2 , Nobuyuki Miyatake 3 , Takeyuki Numata 4 , Izumi Tabata, FACSM 5 . 1 National Institute of Health and Nutrition, Tokyo, Japan. 2 Waseda University, Saitama, Japan. 3 Kagawa University, Takamatsu, Japan. 4 Okayama Southern Institute of Health, Oakayama, Japan. 5 Ritsumeikan University, Kusatsu, Japan. (Sponsor: Izumi Tabata, FACSM) (No relationships reported) Low-back pain is a leading symptom in the Japanese population. The evidence for an association between amount of physical activity and prevalence of low-back pain is insufficient. PurPOsE: Using a randomized-control trial design, we determined the effects of accelerometer-based intervention to go beyond the Physical Activity Reference value for Japanese (PARJ) on the prevalence of low-back pain. METhOds: A total of 821 healthy men and women, 30 to 64 years old, were divided into the active group (n=345) who met PARJ (23 METs-h/week of MVPA) or the inactive group (n=476) who did not meet PARJ. Moreover, the participants of the inactive group were randomly assigned to either the intervention group (n=239) or the control group (n=237). The control group was instructed not to alter their normal activity levels throughout the study period. The intervention group received accelerometer-based counseling to go beyond PARJ for one year. The prevalence of low-back pain was evaluated by the question: “did you have low-back pain lasting longer than 3 months during the last 12 months?” The point prevalence of low-back pain was based on that with a current episode of pain. Adjusting hazard ratio and 95% confidence intervals (95%CI) for the prevalence of low-back pain were obtained using the Cox hazard regression model. rEsuLTs: Among the 821 participants, 526 had no low-back pain at baseline and have been followed-up for more than one year. In the intervention group, the amount of physical activity significantly increased and the mean value reached 23 METs-h/week after one year of intervention. There was no such change in the control group. Seventythree participants reported low-back pain during the average 2.3-year observation period (range: 1-4 years). Using the control group as a reference, the adjusted hazard ratios (95%CI) for the intervention and active groups were 0.50 (0.27-0.94) and 0.65 (0.38-1.09), respectively. CONCLusIONs: These results suggest that the accelerometer-based intervention to go beyond 23 METs-h/week defined as PARJ attenuates the prevalence of low-back pain by ~50%. (NCT00926744) C-31 Free Communication/Poster - Epidemiology of Physical Activity in Pregnancy May 30, 2013, 7:30 AM - 12:30 PM Room: Hall C 1166 Board #111 May 30, 8:00 AM - 9:30 AM description of Motives for and Barriers to Exercising across Pregnancy Erin E. White1 , Karin A. Pfeiffer, FACSM2 , Claudia B. Holzman2 , Daniel R. Gould2 , James M. Pivarnik, FACSM2 . 1 2 Winona State University, Winona, MN. Michigan State University, East Lansing, MI. (No relationships reported) Maternal exercise usually decreases as gestation progresses even though there are numerous benefits derived from continuing this behavior during pregnancy. Understanding motives for and barriers to maternal exercise by trimester may allow physical activity professionals to better individualize maternal exercise programs and increase adherence. PurPOsE: The purpose of this study was to describe the most frequent motives for and barriers to maternal exercise by trimester. METhOds: Women (n = 295) who belonged to a commercial fitness club and had given birth within the last five years completed a retrospective survey regarding trimester-specific motives for and barriers to exercise during pregnancy. Women chose up to three motives and barriers per trimester from a predetermined list (including 9 motives and 27 barriers) based on previous literature. Descriptive statistics were used to assess the frequency of motives and barriers. rEsuLTs: Mean ± SD maternal age at delivery was 27 ± 5.1 yr. Maternal height Vol. 45 No. 5 Supplement S219 and weight at the time of survey completion were 165.2 ± 6.5 cm and 79.5 ± 20.8 kg, respectively. The top two primary motives in trimesters 1, 2, and 3 were to stay healthy (37.4%, 35.5%, and 32.9%, respectively) and weight control (19.8%, 27.1%, and 25.5%, respectively). The third primary motive in trimesters 1 and 2 was fitness (13.7% and 11.6%, respectively); while in trimester 3 it was to relieve stress (10.7%). The top primary barrier to exercise across all three trimesters was lack of energy (27.0%, 18.9%, and 19.4%, respectively). Other primary barriers in trimester 1 were pregnancy-related illness (18.5%) and lack of time (9.3%). Trimester 2 primary barriers included lack of time (9.6%) and lack of motivation (8.2%), while third trimester primary barriers included exercise being too uncomfortable (17.2%) and on bed rest (6.8%). CONCLusION: While the motives of exercise do not change considerably across trimesters of pregnancy, barriers do. More women may continue to exercise throughout pregnancy if they are made aware of various modalities to make exercise more comfortable for them, especially as pregnancy progresses. In addition, discussing time management skills and how to overcome a “lack of energy” may increase exercise participation. Funding: Blue Cross Blue Shield of Michigan Student Award 1167 Board #112 May 30, 8:00 AM - 9:30 AM reliability and Validity of Three Physical activity Measurements during Pregnancy and Postpartum Deanna M. L. Phelan1 , Mallory R. Marshall1 , Rebecca A. Schlaff2 , Alaina K. Vince1 , Karin A. Pfeiffer, FACSM1 , James M. Pivarnik, FACSM1 . 1Michigan State University, East Lansing, MI. 2Saginaw Valley State University, University Center, MI. (No relationships reported) Quality physical activity (PA) studies during pregnancy depend on the accuracy of data collected. However, little is known about the reliability and validity of current modalities designed to measure PA during pregnancy in a free-living environment. PurPOsE: Our purpose was to assess reliability and validity of three PA measures used during pregnancy and postpartum: the Omron pedometer (PED; steps/day/ hr) the SenseWear Armband (SA; kcal/kg/hr), and the Pregnancy Physical Activity Questionnaire (PPAQ; met.min/week). METhOds: Subjects (n=20) wore the PED and SA devices in free-living environments for two consecutive weeks at 20 weeks gestation, 32 weeks gestation, and 12 weeks postpartum. At the end of each week of wear, subjects completed the PPAQ recall instrument to evaluate the prior week’s PA. Intraclass correlation coefficients (ICC) and standard errors of measurement (SEM) were calculated to estimate reliability for the two weeks of wear/recall at each of the three time points. Convergent validity was assessed by averaging consecutive week values for every measure at each time point and performing Pearson correlations among the three modalities. rEsuLTs: Across the study period, PA estimates were 497±192 steps/day/hour, 13.3±3.7 kcal/kg/hour, and 15853±5702 met.min/week. ICC (SEM) values for PED at 20 weeks, 32 weeks, and 12 weeks postpartum were 0.42 (126), 0.89 (53), and 0.86 (93), respectively. Reliability of SA was lower than PED and PPAQ at all three time points (20 weeks=0.55 (1.3), 32 weeks=0.42 (1.2), postpartum=0.19 (2.8)). The PPAQ was more reliable across both pregnancy time points, compared to postpartum (0.88 (3867) and 0.83 (3820) versus 0.57 (5592) for postpartum). Validity estimates were low and variable (-0.37-0.30). CONCLusIONs: Overall, reliability was acceptable for use of these measurement techniques to assess PA in free-living environments during pregnancy. However, convergent validity was poor among the three instruments. Poor validity could be a function of the three modalities measuring different constructs in a free-living environment. In addition, increasing the sample size of our ongoing investigation will allow further and more detailed evaluation of the relationship among these PA measurement modalities during pregnancy and postpartum. 1168 Board #113 May 30, 8:00 AM - 9:30 AM Plasma Lipid Changes associated with Lifestyle Factors across Pregnancy Christina G. Campbell 1 , Courtney K. Blomme 1 , Diana R. DiFabio 1 , Kai Ling Kong 1 , Lorraine M. Lanningham-Foster 1 , Danielle J. Richardson 1 , Katie M. Smith 1 , William G. Thorland 2 . 1 Iowa State University, Ames, IA. 2 Nurse Family Partnership, Denver, CO. (Sponsor: Gregory J. Welk, FACSM) (No relationships reported) Plasma lipid values are known to increase as pregnancy progresses, however the role that lifestyle factors may have on this physiological response during pregnancy is not well defined. PurPOsE: The purpose of this study was to evaluate potential factors that may influence the change in lipid values across pregnancy. METhOds: At weeks 18 and 35 of pregnancy, 57 women provided a fasted blood sample, 3-day weighed diet record, and wore an activity armband for a 7-day, 24hour period. Multiple regression analyses were conducted to evaluate the role of the Abstracts were prepared by the authors and printed as submitted. Thursday, May 30, 2013
Thursday, May 30, 2013 S220 Vol. 45 No. 5 Supplement following independent variables on lipids: body weight, pre-pregnancy body mass index (BMI), daily energy expenditure (EE), daily energy intake (EI), and weekly minutes of moderate-vigorous physical activity (MVPA) performed in ≥10-minute bouts. Measured plasma lipids included total cholesterol (TC), high-density lipoprotein (HDL), and triglycerides (TG); low-density lipoprotein (LDL) was calculated. In each regression model, the respective lipid values (TC, LDL, HDL, or TG) at week 18 were also entered as independent values to adjust for variation in the week 35 values. rEsuLTs: EI was 2145 ± 446 and 2320 ± 497 kcals/d; EE was 1714 ± 280 and 1811 ± 273 kcals/d; and MVPA was 171.5 ± 112.8 and 157.9 ± 143.9 min/wk at week 18 and 35, respectively. While both TC (215.0 ± 36.3 and 267.1 ± 57.3 mg/dL at week 18 and 35, respectively) and LDL (115.0 ± 30.5 and 154.4 ± 48.7 mg/dL at week 18 and 35, respectively) levels at week 35 were related to corresponding lipid levels at week 18 (P
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