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A Self-Paced Walk Test for Individual Calibration of Heart Rate to Energy Expenditure

Kate Westgate, Tomas I. Gonzales, Stefanie Hollidge, Tim Lindsay, Nick Wareham, and Søren Brage

standardized treadmill test and nonexercise calibration. We also compare estimates of cardiorespiratory fitness from the two exercise calibration methods. Our study offers insights into the potential of a self-paced walk test as a practical and inclusive alternative to established individual calibration

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Is the Polar M430 a Valid Tool for Estimating Maximal Oxygen Consumption in Adult Females?

Kevin E. Miller, Timothy R. Kempf, Brian C. Rider, and Scott A. Conger

Background: Previous research studies have found that heart rate monitors that predict maximal oxygen consumption ( V ˙ O 2 max ) are valid for males but overestimate V ˙ O 2 max in females. Inaccurate self-reported physical activity (PA) levels may affect the validity of the prediction algorithm used to predict V ˙ O 2 max . Purpose: To investigate the validity of the Polar M430 in predicting V ˙ O 2 max among females with varying PA levels. Methods: Polar M430 was used to predict V ˙ O 2 max ( p V ˙ O 2 max ) for 43 healthy female study participants (26.9 ± 1.3 years), under three conditions: the participant’s self-selected PA category (sPA), one PA category below the sPA (sPA − 1), and one category above the sPA (sPA + 1). Indirect calorimetry was utilized to measure V ˙ O 2 max ( m V ˙ O 2 max ) via a modified Astrand treadmill protocol. Repeated-measures analyses of covariance using age and percentage of body fat as covariates were used to detect differences between groups. Bland–Altman plots were used to assess the precision of the measurement. Results: p V ˙ O 2 max was significantly correlated with m V ˙ O 2 max (r = .695, p < .001). The mean values for p V ˙ O 2 max and m V ˙ O 2 max were 44.58 ± 9.29 and 43.98 ± 8.76, respectively. No significant differences were found between m V ˙ O 2 max , p V ˙ O 2 max , sPA – 1, and sPA + 1 (p = .492). However, the Bland–Altman plots indicated a low level of precision with the estimate. Conclusions: The Polar M430 was a valid method to predict V ˙ O 2 max across different sPA levels in females. Moreover, an under/overestimation in sPA had little effect on the predicted V ˙ O 2 max .

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Physical Activity, Sedentary Behavior, and Time in Bed Among Finnish Adults Measured 24/7 by Triaxial Accelerometry

Pauliina Husu, Kari Tokola, Henri Vähä-Ypyä, Harri Sievänen, Jaana Suni, Olli J. Heinonen, Jarmo Heiskanen, Kaisu M. Kaikkonen, Kai Savonen, Sami Kokko, and Tommi Vasankari

context of the time-use paradigm as additive and interactive risk factors for health and disease ( Pedisic et al., 2017 ; Rosenberger et al., 2019 ; Sievänen & Kujala 2017 ). The PA is well-known to be closely related to cardiorespiratory fitness (CRF; Kujala et al., 2017 ), while high CRF is

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Depressive Symptoms Are Associated With Accelerometer-Measured Physical Activity and Time in Bed Among Working-Aged Men and Women

Pauliina Husu, Kari Tokola, Henri Vähä-Ypyä, Harri Sievänen, and Tommi Vasankari

analyses, the responses were categorized into “employed” (part- or full-time employee or entrepreneur) and “out of work” (unemployed, retired [aged less than 65], on parental leave, or a student). In addition to these self-reported characteristics, cardiorespiratory fitness (CRF) was also taken into

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Calibrating Physical Activity and Sedentary Behavior for Hip-Worn Accelerometry in Older Women With Two Epoch Lengths: The Women’s Health Initiative Objective Physical Activity and Cardiovascular Health Calibration Study

Kelly R. Evenson, Fang Wen, Christopher C. Moore, Michael J. LaMonte, I-Min Lee, Andrea Z. LaCroix, and Chongzhi Di

cost of physical activities, and cardiorespiratory fitness ( Evenson et al., 2012 ; Hall et al., 2013 ). Previously, we published accelerometer-based cut points using 15-s epochs to optimize signal acquisition among women 60–91 years old from a calibration study that included various laboratory

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Aerobic Capacity Determines Habitual Walking Acceleration, Not Electromyography-Indicated Relative Effort

Arto J. Pesola, Timo Rantalainen, Ying Gao, and Taija Finni

, S.M. , Anderssen , S.A. , Edvardsen , E. , & Hansen , B.H. ( 2016 ). Cardiorespiratory fitness in groups with different physical activity levels . Scandinavian Journal of Medicine and Science in Sports, 26 ( 3 ), 291 – 298 . https://doi.org/10.1111/sms.12425 10.1111/sms.12425 Ekkekakis

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Consequences of Choosing Different Settings When Processing Hip-Based Accelerometry Data From Older Adults: A Practical Approach Using Baseline Data From the SITLESS Study

Jason J. Wilson, Mathias Skjødt, Ilona McMullan, Nicole E. Blackburn, Maria Giné-Garriga, Oriol Sansano-Nadal, Marta Roqué i Figuls, Jochen Klenk, Dhayana Dallmeier, Emma McIntosh, Manuela Deidda, Mark A. Tully, Paolo Caserotti, and On behalf of the SITLESS Group*

of cardiorespiratory fitness ( Rossi Neto et al., 2019 ). Some assumptions using settings more specific to adult populations could have major impacts on PA and SB variables from older adults. Some examples include conflating sedentary time with non-wear-time and the incorrect exclusion of

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The KID Study (Kids Interacting With Dogs): Piloting a Novel Approach for Measuring Dog-Facilitated Youth Physical Activity

Colleen J. Chase, Sarah Burkart, and Katie Potter

childhood physical activity (PA), including more favorable cardiometabolic health, muscular and cardiorespiratory fitness, bone health, and mental health ( Bailey et al., 2018 ; Carter et al., 2016 ; Centers for Disease Control and Prevention, 2008 ). Additionally, higher childhood PA is linked to higher

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Calibrating the Physical Activity Vital Sign to Estimate Habitual Moderate to Vigorous Physical Activity More Accurately in Active Young Adults: A Cautionary Tale

Liam P. Pellerine, Derek S. Kimmerly, Jonathon R. Fowles, and Myles W. O’Brien

. https://doi.org/10.3390/s21041411 10.3390/s21041411 Loprinzi , P.D. , & Wade , B. ( 2019 ). Exercise and cardiorespiratory fitness on subjective memory complaints . Psychology, Health and Medicine, 24 ( 6 ), 749 – 756 . https://doi.org/10.1080/13548506.2018.1557713 10

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Accelerometer-Assessed Prolonged Sitting During Work and Leisure Time and Associations With Age, Body Mass Index, and Health: A Cross-Sectional Study

Inger Mechlenburg, Marianne Tjur, and Kristian Overgaard

-0607 Greer , A.E. , Sui , X. , Maslow , A.L. , Greer , B.K. , & Blair , S.N. ( 2015 ). The effects of sedentary behavior on metabolic syndrome independent of physical activity and cardiorespiratory fitness . Journal of Physical Activity and Health, 12 ( 1 ), 68 – 73 . doi:10.1123/jpah.2013