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Yuri Feito, David R. Bassett, Dixie L. Thompson and Brian M. Tyo

Background:

Activity monitors are widely used in research, and are currently being used to study physical activity (PA) trends in the US and Canada. The purpose of this study was to determine if body mass index (BMI) affects the step count accuracy of commonly used accelerometer-based activity monitors during treadmill walking.

Methods:

Participants were classified into BMI categories and instructed to walk on a treadmill at 3 different speeds (40, 67, and 94 m·min−1) while wearing 4 accelerometer-based activity monitors (ActiGraph GT1M, ActiCal, NL-2000, and StepWatch).

Results:

There was no significant main effect of BMI on pedometer accuracy. At the slowest speed, all waist-mounted devices significantly underestimated actual steps (P < .001), with the NL-2000 recording the greatest percentage (72%). At the intermediate speed, the ActiGraph was the least accurate, recording only 80% of actual steps. At the fastest speed, all of the activity monitors demonstrated a high level of accuracy.

Conclusion:

Our data suggest that BMI does not greatly affect the step-counting accuracy of accelerometer-based activity monitors. However, the accuracy of the ActiGraph, ActiCal, and NL-2000 decreases at slower speeds. The ankle-mounted StepWatch was the most accurate device across a wide range of walking speeds.

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Tanya Prewitt-White, Christopher P. Connolly, Yuri Feito, Alexandra Bladek, Sarah Forsythe, Logan Hamel and Mary Ryan McChesney

CrossFit is a form of resistance training characterized by constantly varied, weight-training, gymnastic, and body weight movements. While resistance training is a popular exercise option among pregnant women, it is not included in current physical activity recommendations for expectant mothers. Additionally, despite negative connotations, there are anecdotal accounts of pregnant women participating in CrossFit training without adverse effects to their pregnancies. Therefore, given the barriers to physical activity during pregnancy and vigorous-intensity exercise, examining the experience of pregnant women participating in CrossFit training is of interest in the present study. Participants in the study included 22 women at least three months post-pregnancy, who had adhered to CrossFit training for at least six months throughout pregnancy and were 18 years of age or older. A semi-structured interview guide was developed and transcripts were analyzed using a thematic content analysis. Researchers searched for themes across the interview data and reached agreement on subsequent themes. Seven themes emerged characterizing the experiences of pregnant women who participated in CrossFit training while pregnant: (1) quitting was not an option, (2) support and community, (3) overcoming judgments and stereotypes, (4) listening to my body and modifying movements, (5) empowerment and pride, (6) easy pregnancy and delivery, and (7) lifestyle and functioning post-baby. Findings offer practical implications for practitioners working with pregnant women hoping to maintain their exercise regimens and demonstrate the barriers and opportunities for pregnant women desiring to maintain healthy lifestyles.