Validity of Activity Trackers in Estimating Energy Expenditure During High-Intensity Functional Training

ABSTRACT

Purpose: The purpose of this study was to evaluate the agreement of five commercially available accelerometers in estimating energy expenditure while performing an acute bout of high-intensity functional training (HIFT). Methods: Participants (n = 47; average age: 28.5 ± 11.6 years) consisted of recreationally active, healthy adults. Each participant completed a session of HIFT: a 15-minute workout consisting of 12 repetitions each of air-squats, sit-ups, push-ups, lunges, pull-ups, steps-ups, and high-knees; performed circuit-style by completing as many rounds as possible. During this session, each participant wore the Cosmed K4b2 portable metabolic analyzer (PMA) and five different accelerometers (ActiGraph GT3X, Nike Fuelband, Fitbit One, Fitbit Charge HR, and Jawbone UP Move). Results: Four of the five activity trackers reported lower (p < .05) total EE values compared to the PMA during the acute bout of HIFT. The waist-mounted device (ActiGraph, 182.55 ± 37.93 kcal) was not significantly different from, and most closely estimated caloric expenditure compared to the PMA (144.99 ± 37.13 kcal) (p = .056). A repeated-measures ANOVA showed that all activity trackers were significantly different from the reference measure (PMA) (p < .05). Systematic relative agreement between the activity trackers was calculated, exhibiting a significant ICC = 0.426 (F [46,230] = 5.446 [p < .05]). Conclusion: The wrist- and hip-mounted activity trackers did not accurately assess energy expenditure during HIFT exercise. With the exception of the ActiGraph GT3X, the remaining four activity trackers showed inaccurate estimates of the amount of kilocalories expended during the HIFT exercise bout compared to the PMA.     

‘You have to be like everyone else’: Support for students with vision impairment in mainstream secondary schools

The experiences of seven Australian senior secondary school students with vision impairment attending mainstream schools in Victoria were explored to gain an understanding of the support mechanisms operating to allow them access to an inclusive education. This qualitative study primarily used the in‐depth interviews of students, augmented by brief interviews with Heads of Education Support, parents, aides and teachers. Students attributed difficulties to time available, accessing e‐print and large format materials, assistive technology and access, and exclusion from classes of science, mathematics, and physical education in particular. In Australia, there is an expectation that legally mandated adjustments for students with disabilities will enable equitable, quality, and inclusive education. This was not evident in the experiences of the students in this study. Having aide support did not prevent exclusionary practices. Educators and support staff need to understand the perspectives of students with vision impairments to better facilitate successful teaching and learning experiences.     

The use of visual schedules and work systems to increase the on‐task behaviour of students on the autism spectrum in mainstream classrooms

Apparent differences in executive function can lead to challenges for students on the autism spectrum in mainstream settings. Difficulties with staying on‐task and transitioning between tasks and task elements can interfere with students’ participation in educational activities and lead to stress and anxiety. While the use of visual supports, such as visual schedules and work systems, has been shown to be effective in supporting students to stay on‐task in special education and autism‐specific settings, there is little research to support the use of these strategies by teachers in mainstream classrooms. This study evaluated the use of visual schedules and work systems in supporting four students on the autism spectrum to stay on‐task and work independently in a mainstream setting. These strategies were implemented by teachers as inclusive practices, and evaluated using observations within the natural classroom environment to examine their feasibility in mainstream settings. All participants demonstrated improvements in on‐task behaviours. Results for other, secondary, dependent variables were mixed, with some students showing reduced off‐task behaviours and increased productivity. The implications for clinical practice and future research directions are discussed.     

Examining the Moderating Effect of Appearance Impression Motivation on the Relationship Between Perceived Physical Appearance and Social Physique Anxiety

We measured the effects of stride rate, resistance, and combined arm-leg use on energy expenditure during elliptical trainer exercise and assessed the accuracy of the manufacturer's energy expenditure calculations. Twenty-six men and women (M age = 29 years, SD = 8; M body weight = 73.0 kg, SD = 15.2) participated. Twenty-two participants performed two tests, one without the arm poles (leg-only) and the other with arm poles (combined arm-leg). The other 4 participants performed one test without the arm poles. Both tests consisted of six 5-min stages (two stride rates, 110 and 134 strides^.min^-1, and three resistance settings: 2, 5, and 8). Steady-state oxygen uptake (VO₂), minute ventilation (VE), heart rate (HR) and rating of perceived exertion (RPE) were measured. Repeated measures analysis of variance determined higher (p < .001) VO₂, VE, and RPE, but not HR, during combined arm-leg versus leg-only exercise at any given intensity. Increases in stride rate and resistance increased VO₂, VE, RPE, and HR with the greatest effect on VE and HR from Levels 5 to 8. The manufacturer's calculated energy expenditure was overestimated during both tests. Although the oxygen cost for elliptical trainer exercise was calculated to be approximately 0.1 ml^.kg^-1 per stride and 0.7 ml^.kg^-1.min^-1 per resistance level, VO₂ varied widely among individuals, possibly due to differences in experience using the elliptical trainer, gender, and body composition. The elliptical trainer offers (a) a variety of intensities appropriate for most individuals and (b) both arm and leg exercise. Due to the wide variability in VO₂, predicting the metabolic cost during elliptical trainer exercise for an individual is not appropriate.     

Classroom Response Systems: A Review of the Literature

As the frequency with which Classroom Response Systems (CRSs) are used is increasing, it becomes more and more important to define the affordances and limitations of these tools. Currently existing literature is largely either anecdotal or focuses on comparing CRS and non-CRS environments that are unequal in other aspects as well. In addition, the literature primarily describes situations in which the CRS is used to provide an individual as opposed to a group response. This article points to the need for a concerted research effort, one that rigorously explores conditions of use across diverse settings and pedagogies.