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Patrick P.J.M. Schoenmakers, Florentina J. Hettinga and Kate E. Reed

High-intensity interval training (HIIT) is regarded as a highly effective training modality to improve cardiorespiratory and metabolic functioning, and it is a common practice in training regimens of many athletes, particularly those involved in endurance events. 1 In HIIT, repeated periods of

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Abby R. Fleming, Nic Martinez, Larry H. Collins, Candi D. Ashley, Maureen Chiodini, Brian J. Waddell and Marcus W. Kilpatrick

Medicine, 2018 ). One specific approach to improving health and fitness through exercise that has received considerable attention in the literature, and among the general population, is high-intensity interval training (HIIT), which incorporates repeated bursts of intense aerobic exercise with periods of

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José D. Jiménez-García, Fidel Hita-Contreras, Manuel de la Torre-Cruz, Raquel Fábrega-Cuadros, Agustín Aibar-Almazán, David Cruz-Díaz and Antonio Martínez-Amat

intrinsic risk factors ( Nemoto, Gen-no, Masuki, Okazaki, & Nose, 2007 ). One of the main barriers to the habitual practice of physical exercise in adults is “the lack of time” ( Stutts, 2002 ). With this in mind, high-intensity interval training (HIIT) was developed with low-volume exercises. Furthermore

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Florence-Emilie Kinnafick, Cecilie Thøgersen-Ntoumani, Sam O. Shepherd, Oliver J. Wilson, Anton J.M. Wagenmakers and Christopher S. Shaw

intervention ( Biddle & Batterham, 2015 ) is high-intensity interval training (HIIT). HIIT typically involves repeated bouts of high-intensity exercise interspersed with periods of low-intensity recovery or rest ( Shepherd et al., 2015 ). HIIT, as an intervention approach for previously inactive adults, has

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Andrea Nicolò, Marco Montini, Michele Girardi, Francesco Felici, Ilenia Bazzucchi and Massimo Sacchetti

effort can be measured by means of respiratory frequency ( f R ), but current evidence is limited to cycling exercise. 11 Unlike V ˙ O 2 , HR, and blood lactate concentration, f R shows a close association with RPE during high-intensity interval training (HIIT) 12 , 13 and other high

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Amelia Guadalupe-Grau, Susana Aznar-Laín, Asier Mañas, Juan Castellanos, Julián Alcázar, Ignacio Ara, Esmeralda Mata, Rosa Daimiel and Francisco José García-García

To investigate the short- and long-term effects of concurrent strength and high-intensity interval training (HIIT) on octogenarian COPD patients, nine males (age = 84.2 ± 2.8 years, BMI = 29.3 ± 2.3) with low to severe COPD levels (2.1 ± 1.5 BODE index) underwent a supervised 9-week strength and HIIT exercise program. Training had a significant (p < .05) impact on senior fitness test scores (23–45%), 30-m walking speed (from 1.29 ± 0.29–1.62 ± 0.33 m/s), leg and chest press 1RM (38% and 45% respectively), maximal isometric strength (30–35%), and 6-min walking test (from 286.1 ± 107.2–396.2 ± 106.5 m), and tended to increase predicted forced vital capacity by 14% (p = .07). One year after the intervention all training-induced gains returned to their preintervention values except for the chest press 1RM (p <.05). Short-term concurrent strength and HIIT training increases physical fitness in the oldest-old COPD patients, and has potential long-term benefits.

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Costas I. Karageorghis, Leighton Jones, Luke W. Howard, Rhys M. Thomas, Panayiotis Moulashis and Sam J. Santich

 recovery period while listening to music). High-intensity interval training (HIIT) is a short-duration form of exercise that entails a series of short, high-intensity efforts, punctuated by recovery periods ( Stork, Banfield, Gibala, & Martin Ginis, 2017 ). Studies have shown that several weeks of HIIT can bring

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Alice M. Wallett, Amy L. Woods, Nathan Versey, Laura A. Garvican-Lewis, Marijke Welvaert and Kevin G. Thompson

-intensity interval training (HIIT) set (Figure  1 ). Measures of body mass, heart rate, blood lactate concentration, rating of perceived exertion (RPE), 18 and affect 19 were used to assess changes in psychophysiological responses. Participants also completed a series of prescribed on-road training rides

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Jeanette M. Ricci, Todd A. Astorino, Katharine D. Currie and Karin A. Pfeiffer

The majority of studies examining children’s responses to high-intensity interval exercise primarily utilized running; however, this modality does not require/include other important aspects of physical activity including muscular fitness. Purpose: To compare acute responses between a body weight resistance exercise circuit (CIRC) and treadmill-based (TM) high-intensity interval exercise. Method: A total of 17 boys (age = 9.7 [1.3] y) completed a graded exercise test to determine peak heart rate, peak oxygen uptake (VO2peak), and maximal aerobic speed. Sessions were randomized and counterbalanced. CIRC required 2 sets of 30-second maximal repetitions of 4 exercises. TM included eight 30-second bouts of running at 100% maximal aerobic speed. Both included 30-second active recovery between bouts. Blood lactate concentration was measured preexercise and postexercise. Rating of perceived exertion, affective valence, and enjoyment were recorded preexercise, after intervals 3 and 6, and postexercise. Results: Participants attained 88% (5%) peak heart rate and 74% (9%) VO2peak for CIRC and 89% (4%) peak heart rate and 81% (6%) VO2peak for TM, with a significant difference in percentage of VO2peak (P = .003) between protocols. Postexercise blood lactate concentration was higher following CIRC (5.0 [0.7] mM) versus TM (2.0 [0.3] mM) (P < .001). Rating of perceived exertion, affective valence, and enjoyment responses did not differ between protocols (P > .05). Conclusion: HR responses were near maximal during CIRC, supporting that this body-weight circuit is representative of high-intensity interval exercise.

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Christopher J. Keating, Juan Á. Párraga Montilla, Pedro Á. Latorre Román and Rafael Moreno del Castillo

-intensity exercise. High-intensity interval training (HIIT) is an exercise regimen that seems to be gaining more popularity in the general population as a quick and effective, yet enjoyable, way to partake in physical activity. High-intensity interval training, just like MICT, can take place in many different forms