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Jason Lake, Peter Mundy, Paul Comfort, John J. McMahon, Timothy J. Suchomel and Patrick Carden

dual-plate system yields a typical measurement range upper limit of 8.8 kN with protection up to 13.2 kN. Although it appears that this portable force plate system may provide a realistic alternative to established systems, nothing is known about its reliability and concurrent validity. Currently, a 1

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Jennifer J. Sherwood, Cathy Inouye, Shannon L. Webb and Jenny O

who are not yet disabled or those with early disability at risk of progression are most likely to benefit from exercise intervention. It is in this population that reliable, valid, and age-appropriate tools are needed to monitor lower limb muscular power. Currently, community exercise programs screen

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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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Hidde P. van der Ploeg, Kitty R.M. Streppel, Allard J. van der Beek, Luc H.V. van der Woude, Miriam Vollenbroek-Hutten and Willem van Mechelen

Background:

The objective was to determine the test-retest reliability and criterion validity of the Physical Activity Scale for Individuals with Physical Disabilities (PASIPD).

Methods:

Forty-five non-wheelchair dependent subjects were recruited from three Dutch rehabilitation centers. Subjects’ diagnoses were: stroke, spinal cord injury, whiplash, and neurological-, orthopedic- or back disorders. The PASIPD is a 7-d recall physical activity questionnaire that was completed twice, 1 wk apart. During this week, physical activity was also measured with an Actigraph accelerometer.

Results:

The test-retest reliability Spearman correlation of the PASIPD was 0.77. The criterion validity Spearman correlation was 0.30 when compared to the accelerometer.

Conclusions:

The PASIPD had test-retest reliability and criterion validity that is comparable to well established self-report physical activity questionnaires from the general population.

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Jing Dong Liu and Pak-kwong Chung

The current study presents the development process and initial validation of a measure designed for assessing psychological needs thwarting (frustration) in a secondary school physical education context (Psychological Needs Thwarting Scale in Physical Education, PNTSPE). Secondary school students (grades 7–9) from Hong Kong (N = 1258) were invited to participate in three studies. In Study 1, item generation and initial content validity of the PNTSPE were achieved. In Study 2, the factorial structure of the measure was tested using exploratory and confirmatory factor analysis. Internal consistency reliabilities of the subscales were also examined. In Study 3, the reliability and validity of the scores derived from the PNTSPE were further examined in an independent sample. Overall, the findings from the three studies provided initial psychometric evidence for the PNTSPE and suggested that the PNTSPE could be used as a valid and reliable measure to assess Hong Kong secondary school students’ psychological needs thwarting in physical education.

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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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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