{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,3]],"date-time":"2026-06-03T13:16:39Z","timestamp":1780492599665,"version":"3.54.1"},"reference-count":30,"publisher":"MDPI AG","issue":"15","license":[{"start":{"date-parts":[[2021,7,21]],"date-time":"2021-07-21T00:00:00Z","timestamp":1626825600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Running power as measured by foot-worn sensors is considered to be associated with the metabolic cost of running. In this study, we show that running economy needs to be taken into account when deriving metabolic cost from accelerometer data. We administered an experiment in which 32 experienced participants (age = 28 \u00b1 7 years, weekly running distance = 51 \u00b1 24 km) ran at a constant speed with modified spatiotemporal gait characteristics (stride length, ground contact time, use of arms). We recorded both their metabolic costs of transportation, as well as running power, as measured by a Stryd sensor. Purposely varying the running style impacts the running economy and leads to significant differences in the metabolic cost of running (p &lt; 0.01). At the same time, the expected rise in running power does not follow this change, and there is a significant difference in the relation between metabolic cost and power (p &lt; 0.001). These results stand in contrast to the previously reported link between metabolic and mechanical running characteristics estimated by foot-worn sensors. This casts doubt on the feasibility of measuring running power in the field, as well as using it as a training signal.<\/jats:p>","DOI":"10.3390\/s21154952","type":"journal-article","created":{"date-parts":[[2021,7,22]],"date-time":"2021-07-22T22:37:14Z","timestamp":1626993434000},"page":"4952","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Limitations of Foot-Worn Sensors for Assessing Running Power"],"prefix":"10.3390","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1194-3429","authenticated-orcid":false,"given":"Tobias","family":"Baumgartner","sequence":"first","affiliation":[{"name":"Institute of Exercise Training and Sport Informatics, Department of Cognitive and Team\/Racket Sport Research, German Sport University Cologne, 50933 Cologne, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Steffen","family":"Held","sequence":"additional","affiliation":[{"name":"Department of Intervention Research in Exercise Training, German Sport University Cologne, 50933 Cologne, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2477-8699","authenticated-orcid":false,"given":"Stefanie","family":"Klatt","sequence":"additional","affiliation":[{"name":"Institute of Exercise Training and Sport Informatics, Department of Cognitive and Team\/Racket Sport Research, German Sport University Cologne, 50933 Cologne, Germany"},{"name":"School of Sport and Health Sciences, University of Brighton, Eastbourne BN20 7SR, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lars","family":"Donath","sequence":"additional","affiliation":[{"name":"Department of Intervention Research in Exercise Training, German Sport University Cologne, 50933 Cologne, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,7,21]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Soulard, J., Vaillant, J., Balaguier, R., Baillet, A., Gaudin, P., and Vuillerme, N. (2020). Foot-Worn Inertial Sensors Are Reliable to Assess Spatiotemporal Gait Parameters in Axial Spondyloarthritis under Single and Dual Task Walking in Axial Spondyloarthritis. Sensors, 20.","DOI":"10.3390\/s20226453"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"2278","DOI":"10.1109\/TBME.2016.2523512","article-title":"Novel Foot Progression Angle Algorithm Estimation via Foot-Worn, Magneto-Inertial Sensing","volume":"63","author":"Huang","year":"2016","journal-title":"IEEE Trans. Biomed. Eng."},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"Falbriard, M., Meyer, F., Mariani, B., Millet, G.P., and Aminian, K. (2018). Accurate Estimation of Running Temporal Parameters Using Foot-Worn Inertial Sensors. Front. Physiol., 9.","DOI":"10.3389\/fphys.2018.00610"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"78","DOI":"10.1519\/JSC.0000000000002595","article-title":"Absolute Reliability and Concurrent Validity of the Stryd System for the Assessment of Running Stride Kinematics at Different Velocities","volume":"35","year":"2021","journal-title":"J. Strength Cond. Res."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"207","DOI":"10.1007\/978-3-030-51064-0_27","article-title":"An Exploratory Analysis of User Needs and Design Issues of Wearable Technology for Monitoring Running Performances","volume":"1206","author":"Scataglini","year":"2021","journal-title":"Adv. Intell. Syst. Comput."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"341","DOI":"10.1080\/17461391.2020.1748117","article-title":"Are we ready to measure running power? Repeatability and concurrent validity of five commercial technologies","volume":"21","year":"2021","journal-title":"Eur. J. Sport Sci."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1","DOI":"10.3389\/fspor.2021.585809","article-title":"Running Speed Estimation Using Shoe-Worn Inertial Sensors: Direct Integration, Linear, and Personalized Model","volume":"3","author":"Falbriard","year":"2021","journal-title":"Front. Sports Act. Living"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"480","DOI":"10.1249\/JSR.0000000000000550","article-title":"Integration of Wearable Sensors into the Evaluation of Running Economy and Foot Mechanics in Elite Runners","volume":"17","author":"Sutehall","year":"2018","journal-title":"Curr. Sports Med. Rep."},{"key":"ref_9","unstructured":"Snyder, K. (2021, June 15). Running Power Definition and Utility. Available online: https:\/\/blog.stryd.com\/2020\/12\/17\/running-power-definition-utility-article\/."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"694","DOI":"10.1177\/1747954119872321","article-title":"Three Norwegian brothers all European 1500m champions: What is the secret?","volume":"14","author":"Tjelta","year":"2019","journal-title":"Int. J. Sports Sci. Coach."},{"key":"ref_11","unstructured":"Powers, S.K. (2018). Exercise Physiology: Theory and Application to Fitness and Performance, McGraw-Hill. [10th ed.]."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1113\/jphysiol.1949.sp004363","article-title":"New methods for calculating metabolic rate with special reference to protein metabolism","volume":"109","author":"Weir","year":"1949","journal-title":"J. Physiol."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1019","DOI":"10.2165\/00007256-200737120-00002","article-title":"Criteria for Determination of Maximal Oxygen Uptake","volume":"37","author":"Midgley","year":"2007","journal-title":"Sports Med."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1007\/s00421-009-1008-7","article-title":"Efficiency in cycling: A review","volume":"106","author":"Ettema","year":"2009","journal-title":"Eur. J. Appl. Physiol."},{"key":"ref_15","unstructured":"(2021, May 19). How to Lead the Pack: Running Power Meters & Quality Data. Available online: https:\/\/blog.stryd.com\/2017\/12\/07\/how-to-lead-the-pack-running-power-meters-quality-data\/."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"793","DOI":"10.1007\/s40279-016-0474-4","article-title":"Is There an Economical Running Technique? A Review of Modifiable Biomechanical Factors Affecting Running Economy","volume":"46","author":"Moore","year":"2016","journal-title":"Sports Med."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"62","DOI":"10.1111\/j.1600-0838.1997.tb00120.x","article-title":"Function and biomechanics of tendons","volume":"7","author":"Kirkendall","year":"2007","journal-title":"Scand. J. Med. Sci. Sports"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"379","DOI":"10.1242\/jeb.198.2.379","article-title":"External, internal and total work in human locomotion","volume":"198","author":"Willems","year":"1995","journal-title":"J. Exp. Biol."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"641","DOI":"10.1007\/s40279-017-0830-z","article-title":"The Relationships Between Internal and External Measures of Training Load and Intensity in Team Sports: A Meta-Analysis","volume":"48","author":"McLaren","year":"2018","journal-title":"Sports Med."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1186\/s40798-015-0007-y","article-title":"Running economy: Measurement, norms, and determining factors","volume":"1","author":"Barnes","year":"2015","journal-title":"Sports Med. Open"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"1121","DOI":"10.1055\/s-0035-1565186","article-title":"Ethical Standards in Sport and Exercise Science Research: 2016 Update","volume":"36","author":"Harriss","year":"2015","journal-title":"Int. J. Sports Med."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"226","DOI":"10.1055\/s-2008-1026039","article-title":"Correlations between Laboratory Testing and Distance Running Performance in Marathoners of Similar Performance Ability","volume":"04","author":"Lehmann","year":"1983","journal-title":"Int. J. Sports Med."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"251","DOI":"10.1080\/17461391.2013.783627","article-title":"Stride frequency in relation to oxygen consumption in experienced and novice runners","volume":"14","author":"Verdijk","year":"2014","journal-title":"Eur. J. Sport Sci."},{"key":"ref_24","first-page":"613","article-title":"Tests for Departure from Normality","volume":"60","author":"Pearson","year":"1973","journal-title":"Biometrika"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"465","DOI":"10.2165\/00007256-200434070-00005","article-title":"Factors Affecting Running Economy in Trained Distance Runners","volume":"34","author":"Saunders","year":"2004","journal-title":"Sports Med."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"1037","DOI":"10.1007\/s00421-010-1582-8","article-title":"Changes in tendon stiffness and running economy in highly trained distance runners","volume":"110","author":"Fletcher","year":"2010","journal-title":"Eur. J. Appl. Physiol."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"245","DOI":"10.1152\/jappl.1994.77.1.245","article-title":"Effect of step length optimization on the aerobic demand of running","volume":"77","author":"Morgan","year":"1994","journal-title":"J. Appl. Physiol."},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Moore, I.S., Ashford, K.J., Cross, C., Hope, J., Jones, H.S.R., and McCarthy-Ryan, M. (2019). Humans Optimize Ground Contact Time and Leg Stiffness to Minimize the Metabolic Cost of Running. Front. Sports Act. Living, 1.","DOI":"10.3389\/fspor.2019.00053"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"683","DOI":"10.1152\/jappl.1991.70.2.683","article-title":"Modeling: Optimal marathon performance on the basis of physiological factors","volume":"70","author":"Joyner","year":"1991","journal-title":"J. Appl. Physiol."},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Austin, C., Hokanson, J., McGinnis, P., and Patrick, S. (2018). The Relationship between Running Power and Running Economy in Well-Trained Distance Runners. Sports, 6.","DOI":"10.3390\/sports6040142"}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/21\/15\/4952\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T06:32:43Z","timestamp":1760164363000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/21\/15\/4952"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,7,21]]},"references-count":30,"journal-issue":{"issue":"15","published-online":{"date-parts":[[2021,8]]}},"alternative-id":["s21154952"],"URL":"https:\/\/doi.org\/10.3390\/s21154952","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,7,21]]}}}