How many interviews are enough? Do qualitative interviews in building energy consumption research produce reliable knowledge?

Galvin, Ray

doi:10.1016/j.jobe.2014.12.001

Cited by 253 publications

(161 citation statements)

References 74 publications

(119 reference statements)

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“…Before step counts were analyzed, the researchers also disseminated the average step counts between the groups and compared the averages to the graduated step index [33]. According to the step index, adults who obtain < 2,500 steps per day are at the basal activity level, 2,200-4,900 (limited activity), 5,000-7,499 (low active), 7,500-9,999 (somewhat active), 10,000-12,400 (active), and > 12,500 (highly active).…”

Section: Resultsmentioning

confidence: 99%

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The Impact of Physically Active Brain Breaks on College Students’ Activity Levels and Perceptions

Stapp¹,

Prior²

2018

JPAR

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A majority of adults in the United States do not attain the recommended 2.5 hours of moderate-to-vigorous exercise each week. This is precipitated by an increased amount of time spent in environments that inhibit movement and promote sedentary behaviors -at work, at home, and in cars. College-aged students (18-29) also engage in a greater amount of sedentary behaviors as they encounter a transitional period in life where many begin making independent lifestyle choices for the first time. Despite the trend towards physical inactivity, higher education provides the ideal platform to develop and employ methods that can impact students' physical activity behaviors. Thus, this study compared the effect of physically active brain breaks in a college classroom on college students' physical activity levels to students who did not participate in physically active brain breaks. An embedded sequential mixed methods design was utilized wherein quantitative data was collected via pedometers during class, while student interviews provided qualitative data to assist the researchers in understanding participants perceptions within the experimental intervention. Results indicated that participants (n = 65) who participated in physically active brain breaks acquired a higher daily step count average, compared to participants (n = 52) who did not participate in physically active brain breaks. Three themes emerged from the interviews that suggest students' experiences with physically active brain breaks were compellingly positive and their perceptions revealed that (1) experience is essential; (2) variety is key; and physically active brain breaks are (3) engaging for all.

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Section: Resultsmentioning

confidence: 99%

“…Step counts were also categorized into step-defined activity levels [33]. To test for normal distribution among the interval dependent variable between the two independent groups, a Shapiro-Wilk test was conducted.…”

Section: Discussionmentioning

confidence: 99%

The Impact of Physically Active Brain Breaks on College Students’ Activity Levels and Perceptions

Stapp¹,

Prior²

2018

JPAR

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“…Twenty-one participants participated in 1 focus group and 2 individual usability tests. Sample sizes for the usability tests were based on saturation of the qualitative data [26]. This criterion involved completing the usability tests until there were no new themes identified.…”

Section: Methodsmentioning

confidence: 99%

TEAMS (Tele-Exercise and Multiple Sclerosis), a Tailored Telerehabilitation mHealth App: Participant-Centered Development and Usability Study

Thirumalai¹,

Rimmer²,

Johnson³

et al. 2018

JMIR Mhealth Uhealth

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BackgroundPeople with multiple sclerosis face varying levels of disability and symptoms, thus requiring highly trained therapists and/or exercise trainers to design personalized exercise programs. However, for people living in geographically isolated communities, access to such trained professionals can be challenging due to a number of barriers associated with cost, access to transportation, and travel distance. Generic mobile health exercise apps often fall short of what people with multiple sclerosis need to become physically active (ie, exercise content that has been adapted to accommodate a wide range of functional limitations).ObjectiveThis usability study describes the development process of the TEAMS (Tele-Exercise and Multiple Sclerosis) app, which is being used by people with multiple sclerosis in a large randomized controlled trial to engage in home-based telerehabilitation.MethodsTwenty-one participants with disabilities (10 people with multiple sclerosis) were involved in the double iterative design, which included the simultaneous development of the app features and exercise content (exercise videos and articles). Framed within a user-centered design approach, the development process included 2 stages: ground-level creation (focus group followed by early stage evaluations and developments), and proof of concept through 2 usability tests. Usability (effectiveness, usefulness, and satisfaction) was evaluated using a mixed-methods approach.ResultsDuring testing of the app’s effectiveness, the second usability test resulted in an average of 1 problem per participant, a decrease of 53% compared to the initial usability test. Five themes were constructed from the qualitative data that related to app usefulness and satisfaction, namely: high perceived confidence for app usability, positive perceptions of exercise videos, viable exercise option at home, orientation and familiarity required for successful participation, and app issues. Participants acknowledged that the final app was ready to be delivered to the public after minor revisions. After including these revisions, the project team released the final app that is being used in the randomized controlled trial.ConclusionsA multi-level user-centered development process resulted in the development of an inclusive exercise program for people with multiple sclerosis operated through an easy-to-use app. The promotion of exercise through self-regulated mHealth programs requires a stakeholder-driven approach to app development. This ensures that app and content match the preferences and functional abilities of the end user (ie, people with varying levels of multiple sclerosis).

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“…In the world, 40% is the amount of energy consumed in the construction 5,6 and, in turn, supports 23%-40% of the world's greenhouse gas emission, particularly CO 2 . 7 Several works have been published in this direction and in several newspapers and journals such as Building Engineering Building and Environment, 8 Building and Environment, [9][10][11] Energy Storage, [12][13][14][15][16] and Energy and Buildings. [17][18][19][20][21][22][23][24][25][26][27][28][29] In most situations, the mechanical cooling devices offer solutions that are neither environment friendly nor energy sustainable.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of conjugate convection combined with the thermal conduction using a polynomial interpolation method

Benachour

Draoui

Imine

et al. 2017

Advances in Mechanical Engineering

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The thermal performance of a building refers to the process of modeling the energy transfer between a building and its surroundings. The objective of this work is to develop a new correlation to estimate the number of Nusselt predictions, to facilitate the design of the walls of buildings based on a numerical simulation with a computational fluid dynamics software which can be coupled after with the Lagrange polynomial interpolation method for high Rayleigh number. For this purpose, a building is modeled as a collection of basic elements (walls, rooms, etc.). Moreover, we developed a FORTRAN program to control the equation of high order. This method is for predicting exchange coefficient and estimating Nusselt number of convection to optimize the design of walls in buildings. This method was performed via the simulation and theoretical case.

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How many interviews are enough? Do qualitative interviews in building energy consumption research produce reliable knowledge?

Cited by 253 publications

References 74 publications

The Impact of Physically Active Brain Breaks on College Students’ Activity Levels and Perceptions

The Impact of Physically Active Brain Breaks on College Students’ Activity Levels and Perceptions

TEAMS (Tele-Exercise and Multiple Sclerosis), a Tailored Telerehabilitation mHealth App: Participant-Centered Development and Usability Study

Numerical simulation of conjugate convection combined with the thermal conduction using a polynomial interpolation method

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