1. Jakicic JM, Kraus WE, Powell KE, Campbell WN, Janz KF, et al., for the 2018 Physical Activity Guidelines Advisory Committee. Association between bout duration of physical activity and health: Systematic review. Med Sci Sports Exerc. 2019;51: 1213–1219. doi: 10.1249/MSS.0000000000001933 31095078
2. Teh KC, Aziz AR. Heart rate, oxygen uptake, and energy cost of ascending and descending the stairs. Med Sci Sports Exerc. 2002;34: 695–99. doi: 10.1097/00005768-200204000-00021 11932581
3. Lewis A, Eves FF. Specific effects of a calorific expenditure intervention in overweight commuters. Ann Behav Med. 2011;42: 257–61. doi: 10.1007/s12160-011-9283-z 21618070
4. National Institute of Clinical Excellence, public health guidance 13 (2008) Workplace health promotion. www.nice.org.uk
5. Soler RE, Leeks KD, Buchanan LR, Brownson RC, Heath GW, Hopkins DH. Point-of-decision prompts to increase stair use; a systematic review update. Am J Prev Med. 2010;38: S292–S300. doi: 10.1016/j.amepre.2009.10.028 20117614
6. Eves FF. Effects of point-of-decision prompts for stair use depend on the alternative. Am J Prev Med. 2010;38: 573–574. doi: 10.1016/j.amepre.2010.02.004 20409507
7. Brownell KD, Stunkard A, Albaum J. Evaluation and modification of exercise patterns in the natural environment. Am J Psychiat. 1980;137: 1540–1545. doi: 10.1176/ajp.137.12.1540 7435710
8. Meyers AW, Stunkard AJ, Coll M, Cooke CJ. Stairs, escalators and obesity. Behav Mod. 1980;4: 355–359.
9. Eves FF. Is there any Proffitt in stair climbing? A headcount of studies testing for demographic differences in choice of stairs. Psychonom Bull Rev. 2014;21: 71–79.
10. McCardle WD, Katch FI, Katch VL. Exercise Physiology, 6th Edition. Philadelphia, US: Lippincott, Williams & Wilkins. 2007 doi: 10.1159/000097953
11. Dishman RK, Oldenburg B, O’Neal H, Shephard RJ. Worksite physical activity interventions. Am J Prev Med. 1998;15: 344–61. doi: 10.1016/s0749-3797(98)00077-4 9838977
12. Eves FF, Webb OJ. Worksite interventions to increase stair climbing; Reasons for caution. Prev Med. 2006;43: 4–7. doi: 10.1016/j.ypmed.2006.03.011 16675007
13. Olander E, Eves FF. Elevator availability and its impact on stair use in a workplace. J Envir Psychol. 2011a;31: 200–206.
14. Kerr J, Eves FF, Carroll D. Getting more people on the stairs: The impact of a new message format. J Health Psychol. 2001a;6: 495–500. doi: 10.1177/135910530100600503 22049448
15. Eves FF, Lewis AL, Griffin C. Modeling effects of stair width on rates of stair climbing in a train station. Prev Med. 2008;47: 270–272. doi: 10.1016/j.ypmed.2007.12.008 18207230
16. Kerr J, Eves FF, Carroll D. Can posters prompt stair use in a worksite environment? J Occ Health. 2001b;43: 205–207.
17. Blake H, Lee S, Stanton T, Gorely T. Workplace intervention to promote stair-use in an NHS setting. Int J Workplace Health Manag. 2008;1: 162–175.
18. Lewis A, Eves FF. Prompt before the choice is made; Effects of a stair climbing intervention in university buildings. Brit J Health Psych. 2012;17: 631–43.
19. Webb OJ, Eves FF. Effects of environmental changes in a stair climbing intervention: generalization to stair descent. Am J Health Prom. 2007;22: 38–44.
20. Kerr J, Eves FF, Carroll D. Six-month observational study of prompted stair climbing. Prev Med. 2011c;33: 422–427.
21. Eves FF, Webb OJ, Mutrie N. A workplace intervention to promote stair climbing: greater effects in the overweight. Obes. 2006;14: 2210–16.
22. Eves FF. All choices are not equal; effects of context on point-of-choice prompts for stair climbing. Obes Rev. 2008;9: 83–84. doi: 10.1111/j.1467-789X.2007.00372.x 18154604
23. Gärling T, Gärling E. Distance minimization in downtown pedestrian shopping. Environ Plan A. 1988;20: 547–554.
24. Eves FF, Olander EK, Nicoll G, Puig-Ribera A, Griffin C. Increasing stair climbing in a train station; effects of contextual variables and visibility. J Envir Psychol. 2009;29: 300–03.
25. Ouellette JA, Wood W. Habit and intention in everyday life: The multiple processes by which past behavior predicts future behavior. Psychol Bull. 1998;124: 54–74.
26. Verplanken B, Aarts H. Habit, attitude and planned behaviour: Is habit an empty construct or an interesting case of goal-directed automaticity. In Stroebe W, Hewstone M. (Eds.), Europe Rev Soc Psychol. 1999;10: p. 101–134. Chichester, England: John Wiley.
27. Eves FF, Puig-Ribera A. Learnt effects of environmental cues on transport-related walking; disrupting habits with health promotion? PLoS ONE. 2019;14: e0220308. doi: 10.1371/journal.pone.0220308 31369609
28. Riener R, Rabuffetti M, Frigo C. Stair ascent and descent at different inclinations. Gait Posture. 2002;15: 32–44. doi: 10.1016/s0966-6362(01)00162-x 11809579
29. Corlett E, Hutcheson C, DeLugan M, Rogozenski J. Ramps or stairs: The choice using physiological and biomechanic criteria. Applied Ergonomics. 1972;3: 195–201. doi: 10.1016/0003-6870(72)90100-7 15677102
30. Srinivasan M. Optimal speed for walking and running, and walking on a moving walkway. Chaos. 2009;19: 026112 1–10.
31. Selinger JC, O’Connor SM, Wong JD, Donelan JM. (2015). Humans can continuously optimize energetic cost during walking. Current Biol. 2015;25: 2452–2456.
32. Steudel-Numbers KL, Wall-Scheffler CM. Optimal running speed and the evolution of hominin hunting strategies. J Human Evol. 2009;56: 355–60.
33. Hoyt DF, Taylor CR. Gait and energetics of locomotion in horses. Nature. 1981;292; 239–40.
34. Nishii J. Legged insects select the optimal locomotor pattern based on energetic cost. Biol Cyber. 2000;83: 435.
35. Prokop T, Schubert M, Berger W. Visual influences on human locomotion. Exper Brain Res. 1997;114: 63–70.
36. Reiser JJ, Pick HL, Ashmead DH, Garing AE. Calibration of human locomotion and models of perceptual-motor organisation. J Exper Psychol; Human Perc Perf. 1995;21: 480–497.
37. White E, Shockley K, Riley MA. Multimodally specified energy expenditure and action-based distance judgments. Psychon Bull Rev. 2013;20: 1371–1377. doi: 10.3758/s13423-013-0462-8 23797989
38. Zadra JR. Proffitt DR. Optic flow is calibrated to walking effort. Psychon Bull Rev. 2016;23: 1491–1496. doi: 10.3758/s13423-016-1017-6 27012862
39. Thorpe SKS, Crompton RH, McNeil Alexander R. Orangutans use compliant branches to lower the energetic cost of locomotion. Biol Letters. 2007;3: 253–56.
40. Wall J, Douglas-Hamilton I, Vollrath F. Elephants avoid costly mountaineering. Current Biol. 2006;16: R527–529.
41. Levine JA, Kotz CM. NEAT–non-exercise activity thermogenesis–egocentric and geocentric environmental factors vs. biological regulation. Acta Physiol Scand. 2005;184: 309–318. doi: 10.1111/j.1365-201X.2005.01467.x 16026422
42. Reeves ND, Spanjaard M, Mohagheghi AA, Baltzopoulos V, Maganaris CN. Older adults employ alternative strategies to operate within their maximum capabilities when ascending stairs. J Electromyog Kinesiol. 2009;19: e57–e68.
43. Eves FF. Thorpe SKS, Lewis A, Taylor-Covill GAH. Does perceived steepness deter stair climbing when an alternative is available? Psychonom Bull Rev. 2014;21: 637–644.
44. Proffitt DR. Embodied perception and the economy of action. Perspec Psychol Sci. 2006;1: 110–122.
45. Proffitt DR, Bhalla M, Gossweiler R, Midgett J. Perceiving geographical slant. Psychonom Bull Rev. 1995;2: 409–428.
46. Bhalla M, Proffitt DR. Visual-motor recalibration in geographical slant perception. J Exper Psychol; Human Perc Perf. 1999;25: 1076–1096.
47. Taylor-Covill GAH, Eves FF. Slant perception on stairs and screens: Effects of sex and fatigue in a laboratory environment. Perc. 2013;42: 459–69.
48. Schnall S, Zadra JR, Proffitt DR. Direct evidence for the economy of action: Glucose and the perception of geographical slant. Perc. 2010;39: 464–482.
49. Durgin F.H, Baird J.A, Greenburg M, Russell R, Shaughnessy K, Waymouth S. Who is being deceived? The experimental demands of wearing a backpack. Psychonom Bull Rev. 2009;16: 964–969.
50. Durgin FH, Klein B, Spiegel A, Strawser CJ, Williams M. The social psychology of perception experiments: Hills, backpacks, glucose and the problem of generalizability. J Exper Psychol; Human Perc Perf. 2012;38: 1582–1595.
51. Taylor-Covill GAH, Eves FF. When what we need influences what we see: Choice of energetic replenishment is linked with perceived steepness. J Exper Psychol; Human Perc Perf. 2014;40: 915–919.
52. Taylor-Covill GAH, Eves FF. Carrying a biological ‘backpack’; quasi-experimental effects of weight status and body fat change on perceived steepness. J Exper Psychol; Human Perc Perf. 2016;42: 331–338.
53. Franchak JM, Adolph KE. Gut estimates: Pregnant women adapt to changing possibilities for squeezing through doorways. Attention, Perc Psychophysics. 2014;26: 460–47.
54. Konczak J, Meeuwsen HJ, Cress ME. Changing affordances in stair climbing: The perception of maximum climbability in young and older adults. J Exper Psychol; Human Perc Perf. 1992;18: 691–697.
55. Levine JA, McCrady SK, Lanningham-Foster LM, Kane PH, Foster RC, Manohar CU. The role of free-living daily walking in human weight gain and obesity. Diabet. 2008;57: 548–54.
56. Ekelund U, Brage S, Besson H, Sharp S, Wareham NJ. Time spent being sedentary and weight gain in healthy adults: reverse or bidirectional causality? Am J Clin Nutr. 2008;88: 612–7. doi: 10.1093/ajcn/88.3.612 18779275
57. Metcalf BS, Hosking J, Jeffery AN, Voss LD, Henley W, et al. Fatness leads to inactivity but inactivity does not lead to fatness: a longitudinal study in children (EarlyBird 45). Arch Dis Child. 2011;96: 942–47. doi: 10.1136/adc.2009.175927 20573741
58. Pedisic Z, Grunseit A, Ding D, Chau JY, Banks E, et al. High Sitting Time or Obesity: Which Came First? Bidirectional Association in a Longitudinal Study of 31,787 Australian Adults. Obes. 2014;22: 2126–2130.
59. Physical Activity Guidelines Advisory Committee. Physical Activity Guidelines Advisory Committee scientific report. Part F. Chapter 11. Promoting Regular Physical Activity. Department of Health and Human Services: Washington, DC, U.S, 2018; pp. 1–104.
60. National Health Service, UK (2018). Physical activity guidelines for adults. Retrieved from https://www.nhs.uk/live-well/exercise/
61. U.S. Department of Health and Human Services (2018). Physical Activity Guidelines for Americans, 2nd edition [pdf]. Retrieved from https://health.gov/paguidelines/second-edition/pdf/Physical_Activity_Guidelines_2nd_edition.pdf
62. Sallis JF, Cervero RB, Ascher W, Henderson KA, Kraft MK, Kerr J. An ecological approach to creating more physically active communities. Ann Rev Public Health 2006;27: 297–322.
63. Bauman AE, Reis RS, Sallis JF, Wells JC, Loos RJF, Martin BW. Correlates of physical activity: why are some people physically active and others not? Lancet 2012;380: 258–71. doi: 10.1016/S0140-6736(12)60735-1 22818938
64. Sallis JF, Cerin E, Conway TL, Adams MA, Frank LD, Pratt M, et al. Physical activity in relation to urban environments in 14 cities worldwide: a cross-sectional study. Lancet 2016;387: 2207–17. doi: 10.1016/S0140-6736(15)01284-2 27045735