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A Method for Quantifying Upper Limb Performance in Daily Life Using Accelerometers
Published on: April 21, 2017
Location, Location, Location: Accelerometer Placement Affects Steps-Based Physical Activity Outcomes During Pregnancy
Mallory R Marshall1, Alexander H K Montoye1, Michelle R Conway1
1Department of Kinesiology, Samford University, Birmingham, Alabama (MRM); Department of Integrative Physiology and Health Science, Alma College, Alma, Michigan (AHKM); Department of Recreation, Exercise and Sport Science, Western Colorado University, Gunnison, Colorado (MRC); Department of Health Science, Saginaw Valley State University, University Center, Michigan (RAS); Department of Kinesiology, Michigan State University, East Lansing, Michigan (KAP, JMP).
Wrist accelerometers overestimate physical activity (PA) during pregnancy, counting more steps and faster cadence but less moderate-to-vigorous activity compared to hip or ankle placements. Use wrist-based PA measurements cautiously in pregnant individuals.
Area of Science:
- Physiology
- Biomedical Engineering
- Exercise Science
Background:
- Physical activity (PA) measurement validity can be affected by physiological changes during pregnancy.
- Accurate PA monitoring is crucial for maternal and fetal health during pregnancy.
- Wearable accelerometers are commonly used to measure PA, but placement may influence accuracy.
Purpose of the Study:
- To evaluate the validity of accelerometer placement (hip, ankle, wrist) for measuring physical activity during pregnancy.
- To compare step counts, cadence, and intensity classification across different accelerometer placements.
- To determine the optimal accelerometer placement for accurate PA assessment in pregnant women.
Main Methods:
- 11 pregnant women participated, wearing accelerometers on the hip, ankle, and wrist.
- Data were collected during the second and third trimesters and postpartum.
- Stepping cadence and PA intensity were calculated and analyzed using repeated-measures ANOVA.
Main Results:
- Wrist accelerometers significantly overestimated daily steps and cadence compared to hip and ankle placements.
- Moderate-to-vigorous PA was underestimated at the wrist compared to hip and ankle.
- Agreement in intensity classification was poor for wrist placements, suggesting unreliable data.
Conclusions:
- Wrist accelerometer placement during pregnancy likely leads to overcounting of PA parameters.
- Hip or ankle placements may provide more valid PA measurements in pregnant populations.
- Further research is needed to refine PA measurement techniques for pregnant women.
