In this engaging episode of the Physical Activity Researcher Podcast, Dr. Olli Tikkanen sits down for a chat with Dr. Javier Brazo-Sayavera, who hails from the University of Pablo de Olavide in Spain, to discuss about the Global Matrix initiative.

This significant effort focuses on monitoring the physical activity levels of children from various countries, with the overarching aim of enhancing the health of young individuals worldwide.

Dr. Brazo-Sayavera shares his journey from his academic beginnings in Spain to his impactful work in Uruguay, and then back to Spain, all while keeping his sights set on improving children's health through a better understanding of physical activity. The discussion highlights how the Global Matrix initiative compares activity levels internationally and identifies successful strategies for motivating children to be more active.

Digging into the specifics of the initiative, they discuss how it evaluates countries based on the physical activity levels of their children and looks at the roles that schools and governments play in promoting healthier lifestyles.

The conversation also touches on the challenges of gathering accurate and meaningful data in this area. Offering a blend of scientific insights and practical advice, this episode is filled with valuable information for anyone interested in public health, education, and the well-being of our younger generations.

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This podcast episode is sponsored by Fibion Inc. | Better Sleep, Sedentary Behaviour and Physical Activity Research with Less Hassle

---

Collect, store and manage SB and PA data easily and remotely -

Discover ground-breaking Fibion SENS

---

SB and PA measurements, analysis, and feedback made easy.

Learn more about Fibion Research

---

Learn more about Fibion Sleep and Fibion Circadian Rhythm Solutions.

---

Fibion Kids - Activity tracking designed for children.

---

Collect self-report physical activity data easily and cost-effectively with Mimove.

---

Explore our Wearables, Experience sampling method (ESM), Sleep, Heart rate variability (HRV), Sedentary Behavior and Physical Activity article collections for insights on related articles.

---

Refer to our article "Physical Activity and Sedentary Behavior Measurements" for an exploration of active and sedentary lifestyle assessment methods.

---

Learn about actigraphy in our guide: Exploring Actigraphy in Scientific Research: A Comprehensive Guide.

---

Gain foundational ESM insights with "Introduction to Experience Sampling Method (ESM)" for a comprehensive overview.

---

Explore accelerometer use in health research with our article "Measuring Physical Activity and Sedentary Behavior with Accelerometers ".

---

For an introduction to the fundamental aspects of HRV, consider revisiting our Ultimate Guide to Heart Rate Variability.

---

Follow the podcast on Twitter https://twitter.com/PA_Researcher

Follow host Dr Olli Tikkanen on Twitter https://twitter.com/ollitikkanen

Follow Fibion on Twitter https://twitter.com/fibion

https://www.youtube.com/@PA_Researcher

Can electrode design support both signal stability and sustainability? José Näf explains how Nahtlos electrodes reduce waste and skin irritation while delivering high-quality data over time.

In this fourth episode, Dr. Olli Tikkanen and José Näf explore the technical and environmental details of electrode design for long-term HRV and ECG measurements. José discusses how offset connectors, biocompatible foil materials, and breathable adhesives improve comfort and data quality. He also explains the sustainability advantages of Nahtlos’ packaging and activation system, which extends product shelf life and cuts down on disposable waste.

The conversation expands into practical tips on cable management, adhesive reactions, and how to reduce motion artifacts during physical activity. They also touch on emerging opportunities in long-term EMG monitoring and multi-sensor wearable setups. This episode gives practical guidance for researchers, developers, and clinicians aiming for long-duration, high-quality physiological data.

__________

This podcast episode is sponsored by Fibion Inc. | Better Sleep, Sedentary Behaviour and Physical Activity Research with Less Hassle

---

Collect, store and manage SB and PA data easily and remotely -

Discover ground-breaking Fibion SENS

---

SB and PA measurements, analysis, and feedback made easy.

Learn more about Fibion Research

---

Learn more about Fibion Sleep and Fibion Circadian Rhythm Solutions.

---

Fibion Kids - Activity tracking designed for children.

---

Collect self-report physical activity data easily and cost-effectively with Mimove.

---

Explore our Wearables, Experience sampling method (ESM), Sleep, Heart rate variability (HRV), Sedentary Behavior and Physical Activity article collections for insights on related articles.

---

Refer to our article "Physical Activity and Sedentary Behavior Measurements" for an exploration of active and sedentary lifestyle assessment methods.

---

Learn about actigraphy in our guide: Exploring Actigraphy in Scientific Research: A Comprehensive Guide.

---

Gain foundational ESM insights with "Introduction to Experience Sampling Method (ESM)" for a comprehensive overview.

---

Explore accelerometer use in health research with our article "Measuring Physical Activity and Sedentary Behavior with Accelerometers ".

---

For an introduction to the fundamental aspects of HRV, consider revisiting our Ultimate Guide to Heart Rate Variability.

---

Follow the podcast on Twitter https://twitter.com/PA_Researcher

Follow host Dr Olli Tikkanen on Twitter https://twitter.com/ollitikkanen

Follow Fibion on Twitter https://twitter.com/fibion

https://www.youtube.com/@PA_Researcher

Can electrode systems self-regulate moisture to keep data quality high for 10 days? José Näf explains how Nahtlos’ innovative design improves both signal stability and skin comfort in long-term ECG and HRV tracking.

In this third episode, Dr. Olli Tikkanen continues the deep dive with José Näf into how advanced electrode technology is addressing the long-standing issues in long-term heart rate variability and ECG measurement. José introduces Nahtlos' breakthrough: a hybrid electrode with a water reservoir and a semi-permeable membrane that mimics natural sweating, maintaining low impedance and high-quality signals for up to 10 days.

They also explore how breathable adhesives, biocompatible conductive textiles, and precise material selection reduce skin irritation and improve patient comfort. José shares the testing process, from self-experimentation to hospital trials, and how their team developed their own standards for evaluating signal quality. This episode gives a rare behind-the-scenes look at how wearable ECG technology evolves from lab innovation to clinical use.

__________

This podcast episode is sponsored by Fibion Inc. | Better Sleep, Sedentary Behaviour and Physical Activity Research with Less Hassle

---

Collect, store and manage SB and PA data easily and remotely -

Discover ground-breaking Fibion SENS

---

SB and PA measurements, analysis, and feedback made easy.

Learn more about Fibion Research

---

Learn more about Fibion Sleep and Fibion Circadian Rhythm Solutions.

---

Fibion Kids - Activity tracking designed for children.

---

Collect self-report physical activity data easily and cost-effectively with Mimove.

---

Explore our Wearables, Experience sampling method (ESM), Sleep, Heart rate variability (HRV), Sedentary Behavior and Physical Activity article collections for insights on related articles.

---

Refer to our article "Physical Activity and Sedentary Behavior Measurements" for an exploration of active and sedentary lifestyle assessment methods.

---

Learn about actigraphy in our guide: Exploring Actigraphy in Scientific Research: A Comprehensive Guide.

---

Gain foundational ESM insights with "Introduction to Experience Sampling Method (ESM)" for a comprehensive overview.

---

Explore accelerometer use in health research with our article "Measuring Physical Activity and Sedentary Behavior with Accelerometers ".

---

For an introduction to the fundamental aspects of HRV, consider revisiting our Ultimate Guide to Heart Rate Variability.

---

Follow the podcast on Twitter https://twitter.com/PA_Researcher

Follow host Dr Olli Tikkanen on Twitter https://twitter.com/ollitikkanen

Follow Fibion on Twitter https://twitter.com/fibion

https://www.youtube.com/@PA_Researcher

Does clothing material affect ECG signal quality? José Näf explains how electrostatic effects, electrode placement, and connector design influence long-term HRV and ECG data accuracy.

In this second episode, Dr. Olli Tikkanen continues his discussion with José Näf, co-founder of Nahtlos, diving deeper into the practical challenges of long-term ECG and HRV monitoring. José shares critical insights on how connector types, electrode placement, and impedance changes over time affect signal quality.

From the role of electrostatic interference caused by clothing materials to the importance of correct electrode positioning along the heart’s axis, this episode is packed with knowledge for researchers and clinicians. The conversation also highlights how to avoid common mistakes in multi-day measurements, especially when working with older patients or when user instructions aren't clear. Whether you're building wearables or planning long-term studies, this talk will help you get more reliable data.

__________

This podcast episode is sponsored by Fibion Inc. | Better Sleep, Sedentary Behaviour and Physical Activity Research with Less Hassle

---

Collect, store and manage SB and PA data easily and remotely -

Discover ground-breaking Fibion SENS

---

SB and PA measurements, analysis, and feedback made easy.

Learn more about Fibion Research

---

Learn more about Fibion Sleep and Fibion Circadian Rhythm Solutions.

---

Fibion Kids - Activity tracking designed for children.

---

Collect self-report physical activity data easily and cost-effectively with Mimove.

---

Explore our Wearables, Experience sampling method (ESM), Sleep, Heart rate variability (HRV), Sedentary Behavior and Physical Activity article collections for insights on related articles.

---

Refer to our article "Physical Activity and Sedentary Behavior Measurements" for an exploration of active and sedentary lifestyle assessment methods.

---

Learn about actigraphy in our guide: Exploring Actigraphy in Scientific Research: A Comprehensive Guide.

---

Gain foundational ESM insights with "Introduction to Experience Sampling Method (ESM)" for a comprehensive overview.

---

Explore accelerometer use in health research with our article "Measuring Physical Activity and Sedentary Behavior with Accelerometers ".

---

For an introduction to the fundamental aspects of HRV, consider revisiting our Ultimate Guide to Heart Rate Variability.

---

Follow the podcast on Twitter https://twitter.com/PA_Researcher

Follow host Dr Olli Tikkanen on Twitter https://twitter.com/ollitikkanen

Follow Fibion on Twitter https://twitter.com/fibion

https://www.youtube.com/@PA_Researcher

Dry electrodes often promise convenience, but why do they so often fail in long-term heart monitoring? José Näf breaks down the science and business behind electrode design for ECG and HRV tracking.

In this episode, Dr. Olli Tikkanen is joined by José Näf, founder of Nahtlos, to explore the challenges and innovations in electrode design for long-term ECG and heart rate variability monitoring. José shares his entrepreneurial journey from computer vision startups to building advanced medical wearables in collaboration with EMPA, a Swiss materials research institute.

José details the strengths and weaknesses of wet gel, solid gel, and dry electrodes, and introduces a hybrid electrode technology designed for long-term use without sacrificing comfort or signal quality. From material compatibility to managing skin reactions and motion artifacts, this episode offers practical insight into real-world problems researchers and developers face in health tech.

____________

This podcast episode is sponsored by Fibion Inc. | Better Sleep, Sedentary Behaviour and Physical Activity Research with Less Hassle

---

Collect, store and manage SB and PA data easily and remotely -

Discover ground-breaking Fibion SENS

---

SB and PA measurements, analysis, and feedback made easy.

Learn more about Fibion Research

---

Learn more about Fibion Sleep and Fibion Circadian Rhythm Solutions.

---

Fibion Kids - Activity tracking designed for children.

---

Collect self-report physical activity data easily and cost-effectively with Mimove.

---

Explore our Wearables, Experience sampling method (ESM), Sleep, Heart rate variability (HRV), Sedentary Behavior and Physical Activity article collections for insights on related articles.

---

Refer to our article "Physical Activity and Sedentary Behavior Measurements" for an exploration of active and sedentary lifestyle assessment methods.

---

Learn about actigraphy in our guide: Exploring Actigraphy in Scientific Research: A Comprehensive Guide.

---

Gain foundational ESM insights with "Introduction to Experience Sampling Method (ESM)" for a comprehensive overview.

---

Explore accelerometer use in health research with our article "Measuring Physical Activity and Sedentary Behavior with Accelerometers ".

---

For an introduction to the fundamental aspects of HRV, consider revisiting our Ultimate Guide to Heart Rate Variability.

---

Follow the podcast on Twitter https://twitter.com/PA_Researcher

Follow host Dr Olli Tikkanen on Twitter https://twitter.com/ollitikkanen

Follow Fibion on Twitter https://twitter.com/fibion

https://www.youtube.com/@PA_Researcher

In this enlightening episode of our podcast, Dr. Olli Tikkanen engages in a thought-provoking conversation with Professor James F. Sallis, a newly appointed Distinguished Professor in the Department of Family Medicine and Public Health at the University of California, San Diego.

Professor Sallis, renowned for his extensive research on promoting physical activity and understanding its environmental influences, delves deep into the psychological aspects of sedentary behavior.

He emphasizes the importance of understanding the psychosocial variables derived from theories like the social cognitive theory and the transtheoretical model. The discussion further explores the role of technology, particularly wearables, in shaping the future of behavioral nutrition and physical activity research.

Professor Sallis candidly shares his concerns about the lack of standardization in data collection and interpretation. Towards the end, he passionately advocates for physical activity researchers to become more vocal in their demands for change, emphasizing the role of physical activity in combating climate change. This episode is not just an academic discourse but a call to action for all listeners.

____________________________________

This podcast episode is sponsored by Fibion Inc. | Better Sleep, Sedentary Behaviour and Physical Activity Research with Less Hassle

---

Collect, store and manage SB and PA data easily and remotely -

Discover ground-breaking Fibion SENS

---

SB and PA measurements, analysis, and feedback made easy.

Learn more about Fibion Research

---

Learn more about Fibion Sleep and Fibion Circadian Rhythm Solutions.

---

Fibion Kids - Activity tracking designed for children.

---

Collect self-report physical activity data easily and cost-effectively with Mimove.

---

Explore our Wearables, Experience sampling method (ESM), Sleep, Heart rate variability (HRV), Sedentary Behavior and Physical Activity article collections for insights on related articles.

---

Refer to our article "Physical Activity and Sedentary Behavior Measurements" for an exploration of active and sedentary lifestyle assessment methods.

---

Learn about actigraphy in our guide: Exploring Actigraphy in Scientific Research: A Comprehensive Guide.

---

Gain foundational ESM insights with "Introduction to Experience Sampling Method (ESM)" for a comprehensive overview.

---

Explore accelerometer use in health research with our article "Measuring Physical Activity and Sedentary Behavior with Accelerometers ".

---

For an introduction to the fundamental aspects of HRV, consider revisiting our Ultimate Guide to Heart Rate Variability.

---

Follow the podcast on Twitter https://twitter.com/PA_Researcher

Follow host Dr Olli Tikkanen on Twitter https://twitter.com/ollitikkanen

Follow Fibion on Twitter https://twitter.com/fibion

https://www.youtube.com/@PA_Researcher

In this enlightening episode of our podcast, Dr. Olli Tikkanen engages in a deep dive with the renowned Professor James F. Sallis, the newly appointed Distinguished Professor in the Department of Family Medicine and Public Health at the University of California, San Diego.

Professor Sallis, also the Director of Active Living Research and an "obesity warrior" as dubbed by Time Magazine, brings to the table over 40 years of experience in the field of physical activity and behavioral medicine.

The discussion kicks off with an exploration into the evolution of physical activity recommendations and the challenges faced in the past four decades. Professor Sallis shares invaluable insights into the meticulous process of developing reliable measures, from questionnaires to accelerometers guidelines, emphasizing the importance of accurate measurement in advancing scientific research.

As the conversation progresses, listeners are treated to a historical perspective on the development of these measures and the significance of adapting them to the ever-evolving world of technology and sedentary behavior.

Whether you're a researcher, a student, or simply someone interested in the intricacies of physical activity and its measurement, this episode promises a wealth of knowledge.

_________________________________

This podcast episode is sponsored by Fibion Inc. | Better Sleep, Sedentary Behaviour and Physical Activity Research with Less Hassle

---

Collect, store and manage SB and PA data easily and remotely -

Discover ground-breaking Fibion SENS

---

SB and PA measurements, analysis, and feedback made easy.

Learn more about Fibion Research

---

Learn more about Fibion Sleep and Fibion Circadian Rhythm Solutions.

---

Fibion Kids - Activity tracking designed for children.

---

Collect self-report physical activity data easily and cost-effectively with Mimove.

---

Explore our Wearables, Experience sampling method (ESM), Sleep, Heart rate variability (HRV), Sedentary Behavior and Physical Activity article collections for insights on related articles.

---

Refer to our article "Physical Activity and Sedentary Behavior Measurements" for an exploration of active and sedentary lifestyle assessment methods.

---

Learn about actigraphy in our guide: Exploring Actigraphy in Scientific Research: A Comprehensive Guide.

---

Gain foundational ESM insights with "Introduction to Experience Sampling Method (ESM)" for a comprehensive overview.

---

Explore accelerometer use in health research with our article "Measuring Physical Activity and Sedentary Behavior with Accelerometers ".

---

For an introduction to the fundamental aspects of HRV, consider revisiting our Ultimate Guide to Heart Rate Variability.

---

Follow the podcast on Twitter https://twitter.com/PA_Researcher

Follow host Dr Olli Tikkanen on Twitter https://twitter.com/ollitikkanen

Follow Fibion on Twitter https://twitter.com/fibion

https://www.youtube.com/@PA_Researcher

In this enlightening episode of Dr. Olli Tikkanen's podcast, we are joined by the esteemed Professor James F. Sallis, a newly appointed Distinguished Professor in the Department of Family Medicine and Public Health at the University of California, San Diego.

Recognized as an "obesity warrior" by Time Magazine and with over 500 scientific publications to his name, Professor Sallis delves deep into the intricate world of physical activity, its implications on public health, and the challenges faced in its promotion.

The discussion sheds light on the subtle yet powerful influences of major industries on sedentary behavior and the complexities of securing dedicated funding for physical activity research.

As the conversation unfolds, listeners are offered a rare glimpse into the evolution of physical activity research, the importance of its implementation, and the pressing need for more research to address the existing challenges.

Join us as we navigate the intersections of physical activity, built environments, and public health with one of the world's leading experts in the field.

_________________________________

This podcast episode is sponsored by Fibion Inc. | Better Sleep, Sedentary Behaviour and Physical Activity Research with Less Hassle

---

Collect, store and manage SB and PA data easily and remotely -

Discover ground-breaking Fibion SENS

---

SB and PA measurements, analysis, and feedback made easy.

Learn more about Fibion Research

---

Learn more about Fibion Sleep and Fibion Circadian Rhythm Solutions.

---

Fibion Kids - Activity tracking designed for children.

---

Collect self-report physical activity data easily and cost-effectively with Mimove.

---

Explore our Wearables, Experience sampling method (ESM), Sleep, Heart rate variability (HRV), Sedentary Behavior and Physical Activity article collections for insights on related articles.

---

Refer to our article "Physical Activity and Sedentary Behavior Measurements" for an exploration of active and sedentary lifestyle assessment methods.

---

Learn about actigraphy in our guide: Exploring Actigraphy in Scientific Research: A Comprehensive Guide.

---

Gain foundational ESM insights with "Introduction to Experience Sampling Method (ESM)" for a comprehensive overview.

---

Explore accelerometer use in health research with our article "Measuring Physical Activity and Sedentary Behavior with Accelerometers ".

---

For an introduction to the fundamental aspects of HRV, consider revisiting our Ultimate Guide to Heart Rate Variability.

---

Follow the podcast on Twitter https://twitter.com/PA_Researcher

Follow host Dr Olli Tikkanen on Twitter https://twitter.com/ollitikkanen

Follow Fibion on Twitter https://twitter.com/fibion

https://www.youtube.com/@PA_Researcher