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Stephen Seiler and Øystein Sylta

The purpose of this study was to compare physiological responses and perceived exertion among well-trained cyclists (n = 63) performing 3 different high-intensity interval-training (HIIT) prescriptions differing in work-bout duration and accumulated duration but all prescribed with maximal session effort. Subjects (male, mean ± SD 38 ± 8 y, VO2peak 62 ± 6 mL · kg–1 · min–1) completed up to 24 HIIT sessions over 12 wk as part of a training-intervention study. Sessions were prescribed as 4 × 16, 4 × 8, or 4 × 4 min with 2-min recovery periods (8 sessions of each prescription, balanced over time). Power output, HR, and RPE were collected during and after each work bout. Session RPE was reported after each session. Blood lactate samples were collected throughout the 12 wk. Physiological and perceptual responses during >1400 training sessions were analyzed. HIIT sessions were performed at 95% ± 5%, 106% ± 5%, and 117% ± 6% of 40-min time-trial power during 4 × 16-, 4 × 8-, and 4 × 4-min sessions, respectively, with peak HR in each work bout averaging 89% ± 2%, 91% ± 2%, and 94% ± 2% HRpeak. Blood lactate concentrations were 4.7 ± 1.6, 9.2 ± 2.4, and 12.7 ± 2.7 mmol/L. Despite the common prescription of maximal session effort, RPE and sRPE increased with decreasing accumulated work duration (AWD), tracking relative HR. Only 8% of 4 × 16-min sessions reached RPE 19–20, vs 61% of 4 × 4-min sessions. The authors conclude that within the HIIT duration range, performing at “maximal session effort” over a reduced AWD is associated with higher perceived exertion both acutely and postexercise. This may have important implications for HIIT prescription choices.

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Øyvind Sandbakk

validating or using technology to gain valuable insights into sport physiology and performance. Technology-driven digital solutions may provide knowledge beyond what standard measurements have previously allowed. Positioning systems, inertial movement units, and various sensors that measure physiological

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Edgar J. Gallardo and Andrew R. Coggan

Numerous studies in recent years have investigated the effects of dietary nitrate (NO 3 − ) on the physiological responses to, and/or performance during, exercise. This interest stems from the fact that dietary NO 3 − is an important source of nitric oxide (NO) via the “reverse” NO 3 −  → nitrite

Open access

several days. It is not known whether daily intake of NZBC extract is required for effectiveness. We examined the effect of daily and intermittent NZBC extract intake on metabolic and physiological responses during brisk walking. Sixteen physically active healthy males (age: 24±6 y, body mass: 78±16 kg

Open access

Peter Peeling, Martyn J. Binnie, Paul S.R. Goods, Marc Sim and Louise M. Burke

of potassium phosphate supplementation on perceptual and physiological responses to maximal graded exercise . International Journal of Sport Nutrition and Exercise Metabolism, 11 ( 1 ), 53 – 62 . PubMed doi:10.1123/ijsnem.11.1.53 10.1123/ijsnem.11.1.53 Greenhaff , P.L. , Casey , A. , Short

Open access

David P. Looney, Mark J. Buller, Andrei V. Gribok, Jayme L. Leger, Adam W. Potter, William V. Rumpler, William J. Tharion, Alexander P. Welles, Karl E. Friedl and Reed W. Hoyt

.P. , Stolwijk , J. , & Hardy , J. ( 1967 ). Comfort and thermal sensations and associated physiological responses at various ambient temperatures . Environmental Research, 1 ( 1 ), 1 – 20 . PubMed ID: 5614624 doi:10.1016/0013-9351(67)90002-3 10.1016/0013-9351(67)90002-3 Gubin , D. , Weinert , D

Open access

includes the measurement of respiratory gas exchange and is the gold standard for determining aerobic fitness, as well as for examining the integrated physiological responses to exercise in paediatric medicine. As the physiological responses to exercise change during growth and development, appropriate

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Melanna F. Cox, Greg J. Petrucci Jr., Robert T. Marcotte, Brittany R. Masteller, John Staudenmayer, Patty S. Freedson and John R. Sirard

-structured settings, are attenuated when they are used in free-living settings ( Lyden, Keadle, et al., 2014 ; Lyden et al., 2011 ; Sasaki, Hickey, et al., 2016 ). The sporadic, intermittent nature of free-living data creates a physiological response that lags behind the movement behavior. Accelerometers capture

Open access

Jo Welsman and Neil Armstrong

-2227.1997.tb08912.x 10.1111/j.1651-2227.1997.tb08912.x 9183481 24. Mirwald RL , Bailey DA . Maximal Aerobic Power . London, Canada : Sports Dynamics ; 1986 . 25. Morse M , Schlutz FW , Cassels DE . Relation of age to physiological responses of the older boy (10–17 years) to exercise . J Appl

Open access

Alan J. McCubbin, Bethanie A. Allanson, Joanne N. Caldwell Odgers, Michelle M. Cort, Ricardo J.S. Costa, Gregory R. Cox, Siobhan T. Crawshay, Ben Desbrow, Eliza G. Freney, Stephanie K. Gaskell, David Hughes, Chris Irwin, Ollie Jay, Benita J. Lalor, Megan L.R. Ross, Gregory Shaw, Julien D. Périard and Louise M. Burke

( Costa et al., 2017 ; Horner et al., 2015 ; Strid et al., 2011 ). The initiation of these physiological responses is dependent on the exercise stress per se (i.e., intensity, duration, and modality) but is exacerbated with heat exposure ( Costa et al., 2017 , 2019a ). The secondary outcomes of these