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Christine M. Tallon, Ryan G. Simair, Alyssa V. Koziol, Philip N. Ainslie and Alison M. McManus

in the nonexercising limb ( 19 ). Exercise induced changes in vasomotor tone within the peripheral vasculature appears to be intensity dependent and biphasic ( 9 ). Postexercise blood flow in the nonexercising limb was reduced immediately after a single bout of high-intensity interval exercise (HIIE

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Yuri Alberto Freire, Geovani de Araújo Dantas de Macêdo, Rodrigo Alberto Vieira Browne, Luiz Fernando Farias-Junior, Ágnes Denise de Lima Bezerra, Ana Paula Trussardi Fayh, José Cazuza de Farias Júnior, Kevin F. Boreskie, Todd A. Duhamel and Eduardo Caldas Costa

a protective role on the cardiometabolic risk attributed to high amounts of time spent in sedentary behavior, 3 , 15 most adults are inactive. 17 One of the main reported barriers to physical activity is lack of time. 18 Low-volume high-intensity interval exercise (LV-HIIE) may be an approach for

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Ali M. McManus, Nathan R. Sletten and Daniel J. Green

) HIIE (n = 10) MISS (n = 10) Exercise watts, W 106 (24)* 52 (12) Exercise HR (%HR max ) 86.1 (5.4)* 69.7 (4.4) RPE (1–10) 7 (2)* 3 (2) HR post, beats·min −1 96 (12)* , ** 87 (9)** HR post60, beats·min −1 78 (8) 75 (6) Abbreviations: HIIE, high-intensity interval exercise; HR, heart rate; %HR max

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Llion A. Roberts, Kris Beattie, Graeme L. Close and James P. Morton

Purpose:

To test the hypothesis that antioxidants can attenuate high-intensity interval training–induced improvements in exercise performance.

Methods:

Two groups of recreationally active males performed a high-intensity interval running protocol, four times per week for 4 wk. Group 1 (n = 8) consumed 1 g of vitamin C daily throughout the training period, whereas Group 2 (n = 7) consumed a visually identical placebo. Pre- and posttraining, subjects were assessed for VO2max, 10 km time trial, running economy at 12 km/h and distance run on the YoYo intermittent recovery tests level 1 and 2 (YoYoIRT1/2). Subjects also performed a 60 min run before and after training at a running velocity of 65% of pretraining VO2max so as to assess training-induced changes in substrate oxidation rates.

Results:

Training improved (P < .0005) VO2max, 10 km time trial, running economy, YoYoIRT1 and YoYoIRT2 in both groups, although there was no difference (P = .31, 0.29, 0.24, 0.76 and 0.59) between groups in the magnitude of training-induced improvements in any of the aforementioned parameters. Similarly, training also decreased (P < .0005) mean carbohydrate and increased mean fat oxidation rates during submaximal exercise in both groups, although no differences (P = .98 and 0.94) existed between training conditions.

Conclusions:

Daily oral consumption of 1 g of vitamin C during a 4 wk high-intensity interval training period does not impair training-induced improvements in the exercise performance of recreationally active males.

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Nic Martinez, Marcus W. Kilpatrick, Kristen Salomon, Mary E. Jung and Jonathan P. Little

High-intensity interval training (HIIT) has many known physiological benefits, but research investigating the psychological aspects of this training is limited. The purpose of the current study is to investigate the affective and enjoyment responses to continuous and high-intensity interval exercise sessions. Twenty overweight-to-obese, insufficiently active adults completed four counterbalanced trials: a 20-min trial of heavy continuous exercise and three 24-min HIIT trials that used 30-s, 60-s, and 120-s intervals. Affect declined during all trials (p < .05), but affect at the completion of trials was more positive in the shorter interval trials (p < .05). Enjoyment declined in the 120-s interval and heavy continuous conditions only (p < .05). Postexercise enjoyment was higher in the 60-s trial than in the 120-s trial and heavy continuous condition (p < .05). Findings suggest that pleasure and enjoyment are higher during shorter interval trials than during a longer interval or heavy continuous exercise.

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Carley O’Neill and Shilpa Dogra

Background:

Exercise triggers asthma symptoms among adults with exercise induced bronchoconstriction (EIBC). This may lead to lower physical activity levels among this population. The purpose of this study was to assess perceived exertion (RPE), perceived breathlessness (RPD), affect (FS), and physical activity enjoyment during and following an acute bout of high intensity interval exercise (HIIE), moderate intensity interval (MIIE) and moderate intensity continuous exercise (MICE) in adults with EIBC.

Methods:

RPD, RPE, and FS were assessed each minute during the sessions and enjoyment was assessed following each session (n = 11).

Results:

RPE was lower during MIIE compared with MICE (P = .006). RPD was lowest during MIIE but was not different between HIIE and MICE. Affect was lower in MICE than HIIE in the last minute of exercise (P = .003) and overall was greatest during the MIIE (P = .022; P = .018). Enjoyment scores were similar between protocols.

Conclusions:

Interval exercise is associated with lower ratings of perceived exertion and dyspnea, an increase in in-task affect, and similar physical activity enjoyment when compared with continuous exercise.

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ZáNean McClain, E. Andrew Pitchford and Jill Pawlowski

temperature. Future studies are still needed to determine if HIIT exercise produces additional cardiorespiratory benefits. Hubbard, E.A., Motl, R.W., & Fernhall, B. (2019). Acute high-intensity interval exercise in multiple sclerosis with mobility disability. Medicine & Science in Sports & Exercise, 51 (5

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Ryan S. Garten, Matthew C. Scott, Tiffany M. Zúñiga, Austin C. Hogwood, R. Carson Fralin and Jennifer Weggen

-induced vascular dysfunction. Thus, this study sought to determine the impact of a prior high-intensity interval exercise bout on prolonged sitting-induced vascular dysfunction. We hypothesized that the exercise stimulus would result in an attenuation of lower limb vascular dysfunction throughout a 3-hour bout of

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Chelsey Klimek, Christopher Ashbeck, Alexander J. Brook and Chris Durall

cohort study 3 Grier et al 3 (2013)       Hak et al 4 (2013)       Weisenthal et al 2 (2014) Implications for Practice, Education, and Future Research Although high-intensity interval exercise is not a new concept, the CrossFit model of combining various high-intensity functional movements is a

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Angus A. Leahy, Narelle Eather, Jordan J. Smith, Charles H. Hillman, Philip J. Morgan, Ronald C. Plotnikoff, Michael Nilsson, Sarah A. Costigan, Michael Noetel and David R. Lubans

, Williams CA , Barker AR . Perspectives on high-intensity interval exercise for health promotion in children and adolescents . Open Access J Sports Med . 2017 ; 8 : 243 – 65 . PubMed ID: 29225481 doi:10.2147/OAJSM.S127395 29225481 10.2147/OAJSM.S127395 4. Buchan DS , Ollis S , Young JD