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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.

Open access

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

Open access

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

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

Open access

Louise M. Burke and Peter Peeling

of Sports Physiology and Performance, 11 , 221 – 226 . doi:10.1123/ijspp.2015-0020 10.1123/ijspp.2015-0020 Glaister , M. , & Gissane , C. ( 2017 ). Caffeine and physiological responses to submaximal exercise: A meta-analysis . International Journal of Sports Physiology and Performance, 5

Open access

Ronald J. Maughan, Susan M. Shirreffs and Alan Vernec

an intervention on the physiological response to exercise, since power output fluctuates and at any given time one individual’s relative power output may vary greatly from that of other participants. It is essential that those who consider the use of supplements understand the limitations of the

Open access

James A. Betts, Javier T. Gonzalez, Louise M. Burke, Graeme L. Close, Ina Garthe, Lewis J. James, Asker E. Jeukendrup, James P. Morton, David C. Nieman, Peter Peeling, Stuart M. Phillips, Trent Stellingwerff, Luc J.C. van Loon, Clyde Williams, Kathleen Woolf, Ron Maughan and Greg Atkinson

, A.M. ( 2015 ). True and false interindividual differences in the physiological response to an intervention . Experimental Physiology, 100, 577 – 588 . PubMed ID: 25823596 doi:10.1113/EP085070 10.1113/EP085070 Atkinson , G. , & Nevill , A.M. ( 1998 ). Statistical methods for assessing

Open access

Philo U. Saunders, Laura A. Garvican-Lewis, Robert F. Chapman and Julien D. Périard

variety of physiological responses that have the potential to increase endurance performance at sea level ( Saunders et al., 2009a ). While an altitude-induced acceleration of red blood cell production resulting in an increase in total hemoglobin mass (Hb mass ) is often considered the primary mechanism