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Darren Steeves, Leo J. Thornley, Joshua A. Goreham, Matthew J. Jordan, Scott C. Landry and Jonathon R. Fowles

tests was investigated to determine their utility in a kayak-specific testing program. Methods Participants The study consisted of a reliability segment followed by a validity segment. Highly trained male and female kayakers were recruited for both segments of this investigation. All participants were

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Scott A. Conger, Alexander H.K. Montoye, Olivia Anderson, Danielle E. Boss and Jeremy A. Steeves

associated with step counts in wrist-worn devices at slower walking speeds ( Chen, Kuo, Pellegrini, & Hsu, 2016 ; Huang, Xu, Yu, & Shull, 2016 ; Storm, Heller, & Mazza, 2015 ). Speed of movement has been an important variable to consider in determining the validity and accuracy of these accelerometer

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Bronwyn K. Clark, Nyssa T. Hadgraft, Takemi Sugiyama and Elisabeth A. Winkler

monitor, similarly experienced lower accuracy in location classification when participants transitioned between locations versus when they remained in the same location continuously ( Magistro et al., 2018 ). These findings suggest it may be possible to use Bluetooth to derive valid measures of office

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Nadia C. Valentini, Lisa M. Barnett, Paulo Felipe Ribeiro Bandeira, Glauber Carvalho Nobre, Larissa Wagner Zanella and Rodrigo Flores Sartori

limited to the population in which the instrument was validated; consequently, content and construct validity must be addressed in other cultures ( Vallerand & Halliwell, 1989 ; Yun & Ulrich, 2002 ). A recent validation investigated the use of the 12 FMS items as part of the PMSC in around 200 Portuguese

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Miguel A. de la Cámara, Sara Higueras-Fresnillo, Verónica Cabanas-Sánchez, Kabir P. Sadarangani, David Martinez-Gomez and Óscar L. Veiga

, self-reported sitting/reclining time is reported as representative of SB. Different studies showed that a single question for measuring SB has moderate to good reliability and moderate validity against accelerometers for estimating total sitting time in adults. 27 , 28 For the single question of the

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Paul F.J. Merkes, Paolo Menaspà and Chris R. Abbiss

meters in which power output is calculated with the use of strain gages. To date, the validity of power output calculated by the Velocomp PowerPod power meter is unknown. Therefore, the aim of this study was to determine the validity of the Velocomp PowerPod power meter during field cycling tests and

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Andreas Wolff Hansen, Inger Dahl-Petersen, Jørn Wulff Helge, Søren Brage, Morten Grønbæk and Trine Flensborg-Madsen


The International Physical Activity Questionnaire (IPAQ) is commonly used in surveys, but reliability and validity has not been established in the Danish population.


Among participants in the Danish Health Examination survey 2007–2008, 142 healthy participants (45% men) wore a unit that combined accelerometry and heart rate monitoring (Acc+HR) for 7 consecutive days and then completed the IPAQ. Background data were obtained from the survey. Physical activity energy expenditure (PAEE) and time in moderate, vigorous, and sedentary intensity levels were derived from the IPAQ and compared with estimates from Acc+HR using Spearman’s correlation coefficients and Bland-Altman plots. Repeatability of the IPAQ was also assessed.


PAEE from the 2 methods was significantly positively correlated (0.29 and 0.49; P = 0.02 and P < 0.001; for women and men, respectively). Men significantly overestimated PAEE by IPAQ (56.2 vs 45.3 kJ/kg/day, IPAQ: Acc+HR, P < .01), while the difference was nonsignificant for women (40.8 vs 44.4 kJ/kg/day). Bland-Altman plots showed that the IPAQ overestimated PAEE, moderate, and vigorous activity without systematic error. Reliability of the IPAQ was moderate to high for all domains and intensities (total PAEE intraclass correlation coefficient = 0.58).


This Danish Internet-based version of the long IPAQ had modest validity and reliability when assessing PAEE at population level.

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Montassar Tabben, Laurent Bosquet and Jeremy B. Coquart


This study examined the effect of performance level on the validity and accuracy of middle-distance running-performance predictions obtained from the nomogram of Mercier et al in male runners.


Official French track-running rankings for the 3000-, 5000-, and 10,000-m events from 2006 to 2014 were examined. The performance level was determined from the official reference table of the Fédération Française d’Athlétisme, and the runners were divided in 3 groups (ie, low, moderate, and high levels). Only male runners who performed in the 3 distance events within the same year were included (N = 443). Each performance over any distance was predicted using the nomogram from the 2 other performances.


No difference was found in low- and moderate-performance-level athletes (0.02 ≤ effect size [ES] ≤ 0.06, 95% limits of agreement [LoA] ≤ 6%). By contrast, a small difference in high-performance-level athletes (P < .01, 0.23 ≤ ES ≤ 0.45, 95% LoA ≤ 11.6%) was found.


The study confirms the validity of the nomogram to predict track-running performance with a high level of accuracy, except for male runners with high performance level (ie, national or international). Consequently, the predictions from the nomogram may be used in training programs (eg, to prescribe tempo runs with realistic training velocities) and competitions (eg, to plan realistic split times to reach the best performance).

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Alejandro Pérez-Castilla, Belén Feriche, Slobodan Jaric, Paulino Padial and Amador García-Ramos

concurrent validity of linear velocity transducer with respect to the standard and presumably accurate force platform method for testing loaded vertical jumps still remains underexplored. Based on considerations above, we aimed to explore the concurrent validity of linear velocity transducer regarding the

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Ali Brian, Laura Bostick, Angela Starrett, Aija Klavina, Sally Taunton Miedema, Adam Pennell, Alex Stribing, Emily Gilbert and Lauren J. Lieberman

& Branta, 2003 ; Kirk & Rhodes, 2011 ; Riethmuller, Jones, & Okely, 2009 ). However, the majority of gross motor interventions often lack ecological validity in that they often occur with researchers leading them or in a manner that cannot be replicated ( Brian et al., 2017a , 2017b ). Specifically