Unlearning,critical action learning and wicked problems     

Mike Pedler  Shih-wei Hsu 《Action Learning: Research and Practice》2014,11(3):296-310

This paper explores the idea of unlearning in Critical Action Learning (CAL) as applied to the wicked problems of organisations and societies. It draws on data and ideas developed during a research project conducted for Skills for Care by Pedler, Abbott, Brook and Burgoyne (Skills for Care 2014) and from experiences on development programmes for social workers on action learning facilitation in 2012 and 2013 with Christine Abbott of the Centre for Action Learning Facilitation (C-ALF).  相似文献   

Caffeine lowers perceptual response and increases power output during high-intensity cycling     

Mike Doherty  Paul M Smith  Michael G Hughes  RC Richard Davison 《Journal of sports sciences》2013,31(7):637-643

The aim of this study was to determine the effects of caffeine ingestion on a ‘preloaded’ protocol that involved cycling for 2?min at a constant rate of 100% maximal power output immediately followed by a 1-min ‘all-out’ effort. Eleven male cyclists completed a ramp test to measure maximal power output. On two other occasions, the participants ingested caffeine (5?mg?·?kg^?1) or placebo in a randomized, double-blind procedure. All tests were conducted on the participants' own bicycles using a Kingcycle? test rig. Ratings of perceived exertion (RPE; 6–20 Borg scale) were lower in the caffeine trial by approximately 1 RPE point at 30, 60 and 120?s during the constant rate phase of the preloaded test (P?<0.05). The mean power output during the all-out effort was increased following caffeine ingestion compared with placebo (794±164 vs 750±163?W; P?=?0.05). Blood lactate concentration 4, 5 and 6?min after exercise was also significantly higher by approximately 1?mmol?·?l^?1 in the caffeine trial (P?<0.05). These results suggest that high-intensity cycling performance can be increased following moderate caffeine ingestion and that this improvement may be related to a reduction in RPE and an elevation in blood lactate concentration.  相似文献   

Sport,physical activity and social exclusion     

Mike Collins 《Journal of sports sciences》2013,31(8):727-740

This paper is a brief review of the concept of social exclusion and its evolution. I address which individuals are excluded from sport and physical activity and how; link inclusion policies to the ‘cross-cutting issues’ and the idea of social capital; and outline the intervention policies being adopted in the new sport strategy ‘Game Plan’ (Department of Culture, Media and Sport, ). I address the link between transport, exercise and health in a case study. Since these policies are new, research and evaluation has been short term and scattered, and outcome measurements have not yet received academic or professional consensus, it is too soon to say for sure what works or even to confirm what is best practice.  相似文献   

Prediction of segmental lean mass using anthropometric variables in young adults     

Aldo Scafoglieri  Jonathan Tresignie  Steven Provyn  Mike Marfell-Jones  Thomas Reilly  Ivan Bautmans 《Journal of sports sciences》2013,31(8):777-785

Abstract

The aim of the present study was to develop and cross-validate anthropometrical prediction equations for segmental lean tissue mass (SLM). One hundred and seventeen young healthy Caucasians (67 men and 50 women; mean age: 31.9 ± 10.0 years; Body Mass Index: 24.3 ± 3.2 kg · m^?2) were included. Body mass (BM), stretch stature (SS), 14 circumferences (CC), 13 skinfolds (SF) and 4 bone breadths (BB) were used as anthropometric measurements. Segmental lean mass of both arms, trunk and both legs were measured by dual energy X-ray absorptiometry as the criterion method. Three prediction equations for SLM were developed as follows: arms = 40.394(BM) + 169.836(CCarm-tensed) + 399.162(CCwrist) – 85.414(SFtriceps) – 39.790(SFbiceps) – 7289.190, where Adj.R ² = 0.97, P < 0.001, and standard error of estimate (SEE) = 355 g;trunk = 181.530(BM) + 155.037(SS) + 534.818(CCneck) + 175.638(CCchest) ? 88.359(SFchest) ? 147.232(SFsupraspinale) ? 46522.165, where Adj.R ² = 0.97, P < 0.001, and SEE = 1077g; and legs = 55.838(BM) + 88.356(SS) + 235.579(CCmid-thigh) + 278.595(CCcalf) + 288.984(CCankle) ? 84.954(SFfront-thigh) ? 53.009(SFmedial calf) ? 28522.241, where Adj.R ² = 0.96, P < 0.001, and SEE = 724 g. Cross-validation statistics showed no significant differences (P < 0.05) between observed and predicted SLM. Root mean squared errors were smallest for arms (362 g), followed by legs (820 g) and trunk (1477 g). These new prediction equations allow an accurate estimation of segmental lean mass in groups of young adults, but estimation errors of 8 to 14% can occur in certain individuals.  相似文献   

Differences in distal lower extremity tissue masses and mass ratios exist in athletes of sports involving repetitive impacts     

Trent W. Lawton  John B. Cronin  Mike R. McGuigan 《Journal of sports sciences》2013,31(6):533-540

Abstract

The purpose of this study was to compare changes in aerobic condition, strength, and muscular endurance following 8 weeks of endurance rowing alone or in combination with weight-training. Twenty-two elite rowers were assigned to (1) rowing (n = 10, 250–270 km · week^?1) or (2) rowing (n = 12, 190–210 km · week^?1) plus four weight-training sessions each week. Pre and post mean and standardized effect-size (ES) differences in aerobic condition (watts at 4 mmol · L^?1) and strength (isometric pull, N), prone bench-pull (6-repetition maximum, 6-RM), 5- and 30-repetition leg-press and 60-repetition seated-arm-pull (J, performed on a dynamometer) normalized by body mass and log-transformed were analysed, after adjusting for gender. The standardized differences between groups were trivial for aerobic condition (ES [±90% CI] = 0.15; ±0.28, P = 0.37) and prone bench-pull (ES = 0.27; ±0.33, P = 0.18), although a moderate positive benefit in favour of rowing only was observed for the seated-arm-pull (ES = 0.42; ±0.4, P = 0.08). Only the weight-training group improved isometric pull (12.4 ± 8.9%, P < 0.01), 5-repetition (4.0 ± 5.7%, P < 0.01) and 30-repetition (2.4 ± 5.4%, P < 0.01) leg-press. In conclusion, while gains in aerobic condition and upper-body strength were comparable to extensive endurance rowing, weight-training led to moderately greater lower-body muscular-endurance and strength gains.  相似文献   

The effects of sodium bicarbonate (NaHCO3) ingestion on high intensity cycling capacity     

Matthew F. Higgins  Rob S. James  Mike J. Price 《Journal of sports sciences》2013,31(9):972-981

Abstract

Ten healthy, non-cycling trained males (age: 21.2 ± 2.2 years, body mass: 75.9 ± 13.4 kg, height: 178 ± 6 cm, [Vdot]O_2PEAK: 46 ± 10 ml · kg^?1 · min^?1) performed a graded incremental exercise test, two familiarisation trials and six experimental trials. Experimental trials consisted of cycling to volitional exhaustion at 100%, 110% and 120% W_PEAK, 60 min after ingesting either 0.3 g · kg^?1 body mass sodium bicarbonate (NaHCO₃) or 0.1 g · kg^?1 body mass sodium chloride (placebo). NaHCO₃ ingestion increased cycling capacity by 17% at 100% W_PEAK (327 vs. 383 s; P = 0.02) although not at 110% W_PEAK (249 vs. 254 s; P = 0.66) or 120% W_PEAK (170 vs. 175 s; P = 0.60; placebo and NaHCO₃ respectively). Heart rate (P = 0.02), blood lactate (P = 0.001), pH (P < 0.001), [HCO₃ ^?], (P < 0.001), and base excess (P < 0.001) were greater in all NaHCO₃ trials. NaHCO₃ attenuated localised ratings of perceived exertion (RPE_L) to a greater extent than placebo only at 100% W_PEAK (P < 0.02). Ratings of abdominal discomfort and gut fullness were mild but higher for NaHCO₃. NaHCO₃ ingestion significantly improves continuous constant load cycling at 100% W_PEAK due to, in part, attenuation of RPE_L.  相似文献   

Book Reviews     

Dean Allen  Sreyashi Dastidar  Jeffrey S. Gurock  Richard Haynes  Mike Huggins  Marc Keech 《国际体育史杂志》2013,30(6):956-976

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Sporting Heroes of the North     

Mike Huggins 《国际体育史杂志》2013,30(11):1628-1630

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Immortals of British Sport: A Celebration of Britain's Sporting History Through Sculpture     

Mike Huggins 《国际体育史杂志》2013,30(17):2273-2275

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Learning from Evaluation at the Open University II. Helping students to learn from audio-visual media     

Stephen Brown  Mike Nathenson  Gill Kirkup 《British journal of educational technology : journal of the Council for Educational Technology》1982,13(3):217-236

Much of previous media research suggests that there are no significant differences between the teaching effectiveness of different media. As a distance teaching institution, however, the Open University is highly dependent on media to perform functions which in a more conventional context would be handled by live, face-to-face, tuition. Consequently, the University has a keen interest in exploiting the special properties of different media to the full, and in developing students' skills to handle different media. The new technology foundation course, T101 'Living with Technology', attempts both of these aims with some success. The main conclusions drawn from a study of the way audio-visual media are used in the course are that the characteristics of television, radio and audio-cassettes do lend themselves to particular teaching functions but that, in a distance teaching context, a factor of overriding importance is the extent to which any educational medium is accessible and controllable by the learner. The findings also suggest that students can be helped to learn more effectively from audio-visual media, providing a carefully structured approach is taken to the gradual development of learning skills, and the various media are well integrated with each other.  相似文献