Author contributions conceptualization jt gp ta data

Author Contributions
Conceptualization: JT GP TA.
Data curation: JT TW TA.
Formal analysis: JT TW TA.
Investigation: JT GP TW TA.
Methodology: JT GP TA.
Project administration: TA.
Resources: JT GP TW TA.
Supervision: TA.
Enjoyment and Interval Training
PLOS ONE | DOI:10.1371/journal.pone.0166299 January 11, 2017 9 / 11

Validation: JT GP TW TA.
Visualization: JT TA.
Writing – original draft: JT GP TW TA.
Writing – review & editing: JT GP TW TA.
References
1. Garber CE, Blissmer B, Deschenes MR, Franklin BA, Lamonte MJ, Lee IM, et al. Quantity and quality of
exercise for developing and maintaining cardiorespiratory, musculoskeletal, and neuromotor fitness in
apparently healthy adults: Guidance for prescribing exercise. Med Sci Sport Exerc. 2011; 43: 1334–59.
2. Centers for Disease Control and Prevention. Press Release: One in Five Adults Meet Physical Activity
Guidelines; 2014. Department of Health and Human Services. Atlanta, GA: U.S.
3. Sequeira S, Cruz C, Pinto D, Santos L, Marques A. Prevalence of barriers for physical activity in adults
according to gender and socioeconomic status. Br J Sports Med. 2011; 45: A18–19.
4. Trost SG, Owen N, Bauman AE, Sallis JF, Brown W. Correlates of adults’ participation in physical activ-
ity: Review and update. Med Sci Sports Exerc. 2002; 34: 1996–2001. doi: 10.1249/01.MSS.
0000038974.76900.92 PMID: 12471307
5. Gibala MJ, Little JP, MacDonald MJ, Hawley JA. Physiological adaptations to low-volume, high-intensity
interval training in health and disease. J Physiol. 2012; 590(5): 1077–84. doi: 10.1113/jphysiol.2011.
224725 PMID: 22289907
6. Burgomaster KA, Howarth KR, Phillips SM, Rakobowchuk M, MacDonald MJ. Similar metabolic adapta-
tions during exercise after low volume sprint interval and traditional endurance training in humans. J
Physiol. 2008; 586: 151–60. doi: 10.1113/jphysiol.2007.142109 PMID: 17991697
7. Nybo L, Sundstrup E, Jakobsen MD, Mohr M, Hornstrup T, Simonsen L, et al. High-intensity training
versus traditional exercise interventions for promoting health. Med Sci Sports Exerc. 2010; 42
(10):1951–58. doi: 10.1249/MSS.0b013e3181d99203 PMID: 20195181
8. Ekkekakis P, Parfitt G, Petruzzello SJ. The pleasure and displeasure people feel when they exercise at
different intensities: decennial update and progress towards a tripartite rationale for exercise intensity
prescription. Sports Med. 2011; 41(8): 641–71. doi: 10.2165/11590680-000000000-00000 PMID:
21780850
9. Hardy CJ, Rejeski WJ. Not what, but how one feels: the measurement of affect during exercise. J Sport
Exerc Psychol. 1989; 11: 304–17.
10. Williams DM, Dunsiger S, Ciccoli JT, Lewis BA, Albrecht AE, Marcus BH. Acute affective responses to
a moderate-intensity exercise stimulus predicts physical activity participation 6 and 12 months later.
Psychol Sport Exerc. 2008; 9: 231–45. doi: 10.1016/j.psychsport.2007.04.002 PMID: 18496608
11. Helgerud J, H ø ydal K, Wang E, Karlsen T, Berg P, Bjerkaas M, et al. Aerobic high-intensity intervals
improve VO2max more than moderate training. Med Sci Sports Exerc. 2007; 39(4): 665–71. doi: 10.
1249/mss.0b013e3180304570 PMID: 17414804
12. Bartlett JD, Close GL, MacLaren DPM, Gregson W, Drust B, Morton JP. High-intensity interval running
is perceived to be more enjoyable than moderate-intensity continuous exercise: Implications for exer-
cise adherence. J Sports Sci. 2011; 29: 547–53. doi: 10.1080/02640414.2010.545427 PMID:
21360405
13. Oliveira BRR, Slama FA, Deslandes AC, Furtado ES, Santos TM. Continuous and high-intensity inter-