About the Authors

Matthew P. Wallen

Contributed equally to this work with: Matthew P. Wallen, Sjaan R. Gomersall, Shelley E. Keating, Ulrik Wisløff, Jeff S. Coombes

Affiliation Centre for Research on Exercise, Physical Activity and Health (CRExPAH), School of Human Movement and Nutrition Sciences, The University of Queensland, Brisbane, Queensland, Australia

Sjaan R. Gomersall

Contributed equally to this work with: Matthew P. Wallen, Sjaan R. Gomersall, Shelley E. Keating, Ulrik Wisløff, Jeff S. Coombes

Affiliation Centre for Research on Exercise, Physical Activity and Health (CRExPAH), School of Human Movement and Nutrition Sciences, The University of Queensland, Brisbane, Queensland, Australia

Shelley E. Keating

Contributed equally to this work with: Matthew P. Wallen, Sjaan R. Gomersall, Shelley E. Keating, Ulrik Wisløff, Jeff S. Coombes

Affiliation Centre for Research on Exercise, Physical Activity and Health (CRExPAH), School of Human Movement and Nutrition Sciences, The University of Queensland, Brisbane, Queensland, Australia

Ulrik Wisløff

Contributed equally to this work with: Matthew P. Wallen, Sjaan R. Gomersall, Shelley E. Keating, Ulrik Wisløff, Jeff S. Coombes

Affiliation K.G. Jebsen Center of Exercise in Medicine, Department of Circulation and Medical Imaging, Norwegian University of Science and Technology, Trondheim, Norway

Jeff S. Coombes

Contributed equally to this work with: Matthew P. Wallen, Sjaan R. Gomersall, Shelley E. Keating, Ulrik Wisløff, Jeff S. Coombes

jcoombes@uq.edu.au

Affiliation Centre for Research on Exercise, Physical Activity and Health (CRExPAH), School of Human Movement and Nutrition Sciences, The University of Queensland, Brisbane, Queensland, Australia

Competing Interests

The principal investigator on the study (Coombes) received an unrestricted grant from Coca Cola that was used to partially fund this study. The purpose of the financial support was to support research investigating the effects of high intensity exercise on energy balance in participants with the metabolic syndrome. To assess energy expenditure we first wanted to conduct a sub-study to investigate the accuracy of wrist worn devices to collect these data – leading to the submitted manuscript. As an unrestricted grant, Coca Cola had no input or control over any aspect of the study. Our only obligation/communication to Coca Cola regarding this study is to notify them of what we had done. This does not alter the authors’ adherence to PLOS ONE policies on sharing data and materials. Professor Wisløff (co-investigator on the study) is Director of a company (Beatstack) that has developed and patented a smart phone application called the ‘Personal Activity Intelligence, PAI’. Beatstack is now partially owned by Mio Global. This has led to the PAI app only being able to utilise heart rate data from Mio devices. Mio are developing more wrist worn heart rate devices (as would be most similar companies) and Professor Wisløff is working with the company to develop these products as part of his involvement in the Beatstack company and his interests in the PAI app. None of the Beatstack products or the Mio company had any involvement in the study. This does not alter the authors’ adherence to PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: MW SG JC UW. Performed the experiments: MW. Analyzed the data: MW JC SG SK. Wrote the paper: MW SG SK UW JC.