Harrison Evans
University of South Australia
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Featured researches published by Harrison Evans.
Medicine and Science in Sports and Exercise | 2012
Gaynor Parfitt; Harrison Evans; Roger G. Eston
PURPOSE Despite endorsement by various health organizations, there is a lack of research on the effectiveness of perceptually regulated exercise training (PRET) as a method of exercise intensity prescription. The purpose of this study was to confirm the efficacy of an 8-wk PRET program clamped at RPE13 to improve aerobic fitness and cardiovascular health. The affective response to this method of exercise prescription was also assessed. METHODS Sedentary volunteers (age = 34.3 ± 13.0 yr, weight = 72.5 ± 13.7 kg, height = 1.7 ± 0.1 m) were randomly assigned to either a training (n = 16) or a control (n = 10) group. All participants completed a graded exercise test to determine aerobic capacity at baseline and after the intervention. Participants allocated to the training group performed 30 min of PRET at RPE13 on the Borg 6-20 RPE Scale on three occasions per week for 8 wk. Affective valence was measured using the Feeling Scale. RESULTS The RPE-regulated training resulted in improvements (P < 0.01) in V˙O(2max), mean arterial pressure, total cholesterol, and body mass index in the training group across time. During training at RPE13, V˙O(2) increased (P < 0.01) from week 1 (19.2 ± 1.1 mL·kg·min) to week 8 (23.4 ± 1.1 mL·kg·min). On average, affect was positive and stable throughout training (3.4 ± 1.2). Affect measured at RPE13 in the baseline and postintervention graded exercise tests increased in the training group (3.1 ± .9 to 3.7 ± 1.1, P < 0.05), whereas it decreased in the control group (2.8 ± 1.1 to 2.6 ± 1). CONCLUSIONS Sedentary individuals were able to use PRET at RPE13 to improve their cardiovascular health and fitness, and on average, the exercise intensities selected were perceived to feel pleasant.
European Journal of Sport Science | 2014
Harrison Evans; Gaynor Parfitt; Roger G. Eston
Abstract A maximal, perceptually-regulated exercise test (PRETmax) whereby participants control the intensity according to preset ratings of perceived exertion (RPE) may induce more positive affective responses than a conventional ‘experimenter controlled’ incremental ramp test (Iramp). The authors aimed to assess (1) if a PRETmax could be used to measure O2max and (2) if affective responses differed between the PRETmax and Iramp. Sixteen participants (age 20.5, s=1.2 y) completed a PRETmax which required them to adjust the resistance on a recumbent cycle ergometer to correspond to prescribed RPEs of 9, 11, 13, 15, 17 and 20 and an Iramp. Both tests ended with volitional exhaustion. Affect was recorded every minute throughout exercise using the Feeling Scale (FS). There was no difference (P>0.05) between O2max measured by PRETmax (43.5, s=4.1 ml kg−1 min−1) and Iramp (44.3, s=4.9 ml kg−1 min−1). Participants reported feeling significantly less negative (P<0.001) throughout the PRETmax compared to Iramp (average mean difference FS = 1.4, s=0.1). The PRETmax has application in situations where the direct measurement of O2max is required and the affective responses of the individual are considered to be important.
Pediatric Exercise Science | 2014
Katia Ferrar; Harrison Evans; Ashleigh E. Smith; Gaynor Parfitt; Roger G. Eston
Many equations to predict maximal oxygen uptake (VO2max) from submaximal exercise tests have been proposed for young people, but the composition and accuracy of these equations vary greatly. The purpose of this systematic review was to analyze all submaximal exercise-based equations to predict VO2max measured via direct gas analysis for use with young people. Five databases were systematically searched in February 2013. Studies were included if they used a submaximal, exercise-based method to predict VO2max; the actual VO2max was gas analyzed; participants were younger than 18 years; and equations included at least one submaximal exercise-based variable. A meta-analysis and narrative synthesis were conducted. Sixteen studies were included. The mean equation validity statistic was strong, r = .786 (95% CI 0.747-0.819). Subgroup meta-analysis suggests exercise mode may contribute to the overall model, with running- and walking-based predictive equations reporting the highest mean r values (running r = .880; walking r = .821) and cycling the weakest (r = .743). Selection of the most appropriate equation should be guided by factors such as purpose, logistic limitations, appropriateness of the validation sample, the level of study bias, and the degree of accuracy. Suggestions regarding the most accurate equation for each exercise mode are provided.
European Journal of Applied Physiology | 2012
Roger G. Eston; Harrison Evans; James Faulkner; Danielle Lambrick; Harran Al-Rahamneh; Gaynor Parfitt
Journal of Sports Science and Medicine | 2009
Roger G. Eston; Harrison Evans
European Journal of Applied Physiology | 2013
Harrison Evans; Gaynor Parfitt; Roger G. Eston
Archives of Physical Medicine and Rehabilitation | 2016
Ashleigh E. Smith; Harrison Evans; Gaynor Parfitt; Roger G. Eston; Katia Ferrar
Journal of Science and Medicine in Sport | 2013
Roger G. Eston; Harrison Evans; Ashleigh E. Smith; Gaynor Parfitt; Gavin D. Tempest
Journal of Science and Medicine in Sport | 2013
K. Ferrar; Harrison Evans; Gaynor Parfitt; Roger G. Eston
Journal of Science and Medicine in Sport | 2013
Harrison Evans; Gaynor Parfitt; Roger G. Eston