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Complex Terrain Load Carriage Energy Expenditure Estimation Using Global Positioning System Devices
Abstract
Introduction: Military load carriage can cause extreme energy expenditure (EE) that is difficult to estimate due to complex terrain grades and surfaces. Global Positioning System (GPS) devices capture rapid changes in walking speed and terrain but the delayed respiratory response to movement is problematic. We investigated the accuracy using GPS data in three different equations to estimate EE during complex terrain load carriage. Methods: Twelve active duty military personnel (age, 20 ± 3 yr; height, 174 ± 8 cm; body mass, 85 ± 13 kg) hiked a complex terrain trail on multiple visits under different external load conditions. Energy expenditure was estimated by inputting GPS data into three different equations: the Pandolf–Santee equation, a recent GPS-based equation from de Müllenheim et al.; and the Minimum Mechanics model. Minute-by-minute EE estimates were exponentially smoothed using smoothing factors between 0.05 and 0.95 and compared with mobile metabolic sensor EE measurements. Results: The Pandolf–Santee equation had no significant estimation bias (−2 ± 12 W; P = 0.89). Significant biases were detected for the de Müllenheim equation (38 ± 13 W; P = 0.004) and the Minimum Mechanics model (−101 ± 7 W; P < 0.001). Conclusions: Energy expenditure can be accurately estimated from GPS data using the Pandolf–Santee equation. Applying a basic exponential smoothing factor of 0.5 to GPS data enables more precise tracking of EE during non–steady-state exercise.
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Metadata
- Authors
- POTTER, A. W., SANTEE, W. R., MULLEN, S. P., KARIS, A. J., BLANCHARD, L. A., ROME, M. N., PITTS, K. P., & LOONEY, D. P.
- Affiliations
- United States Army Research Institute of Environmental Medicine, Natick, MA;
- U.S. Army Research Institute of Environmental Medicine (US)
- Venue
- Medicine & Science in Sports & Exercise
- Published
- 2018-10
- Volume
- 50
- Issue
- 10
- Pages
- 2145-2149
- ISSN
- 0195-9131 (ISSN-L)
- 1530-0315
- OpenAlex
- W2810636502
- Cited by
- 10
- References
- 35
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 1 · 2021: 3 · 2020: 1 · 2019: 2 · 2018: 1
- FWCI
- 1.63
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Medicine & Science in Sports & Exercise (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Occupational Health and Performance
- Health Sciences › Medicine › Physiology (medical) › Cardiovascular and exercise physiology
- Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
- Keywords
- energy expenditure estimation, GPS devices, military load carriage, complex terrain, exponential smoothing, metabolic rate, military personnel
- MeSH terms
- Adolescent, Energy Metabolism, Female, Humans, Male, Military Personnel, Walking, Weight-Bearing, Geographic Information Systems, Young Adult
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