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Ajmol Ali Jemma O’Donnell Pamela Von Hurst Andrew Foskett Sherina Holland Carlene Starck 《Journal of sports sciences》2016,34(4):330-341
We examined the influence of caffeine supplementation on cognitive performance and perceptual responses in female team-game players taking low-dose monophasic oral contraceptives of the same hormonal composition. Ten females (24 ± 4 years; 59.7 ± 3.5 kg body mass; 2–6 training sessions per week) took part in a randomised, double-blind, placebo-controlled crossover-design trial. A 90-min intermittent treadmill-running protocol was completed 60 min following ingestion of a capsule containing either 6 mg ? kg?1 anhydrous caffeine or artificial sweetener (placebo). Perceptual responses (ratings of perceived exertion (RPE), feeling scale (FS), felt arousal scale (FAS)), mood (profile of mood states (POMS)) and cognitive performance (Stroop test, choice reaction time (CRT)) were completed before, during and after the exercise protocol, as well as after ~12 h post exercise. Caffeine ingestion significantly enhanced the ratings of pleasure (P = 0.008) and arousal (P = 0.002) during the exercise protocol, as well as increased vigour (POMS; P = 0.007), while there was a tendency for reduced fatigue (POMS; P = 0.068). Caffeine ingestion showed a tendency to decrease RPE (P = 0.068) and improve reaction times in the Stroop (P = 0.072) and CRT (P = 0.087) tests. Caffeine supplementation showed a positive effect on perceptual parameters by increasing vigour and a tendency to decrease fatigue during intermittent running activity in female games players taking low-dose monophasic oral contraceptive steroids (OCS). 相似文献
53.
Von V. Pittman 《Distance Education》1988,9(2):225-233
Like other professions and vocations, correspondence study has provided the inspiration and setting for works of fiction. Novelists and short story writers have used correspondence study to convey broad humour, satire, and tragedy. They have also used it for such genre writings as murder mysteries and science fiction. For the most part, fictional portrayals are negative and exaggerated, with many characters drawn from stereotypes. In spite of this, correspondence study and distance education instructors and administrators should find these portrayals of themselves and their work enjoyable, and perhaps even useful. 相似文献
54.
Greg Wang Robert Von Der Linn Diane Foucar‐Szocki Oris Griffin Erin Sceiford 《Performance Improvement Quarterly》2003,16(3):17-30
This study fills a gap in the current HRD literature of return on investment (ROI) analysis of technology‐based learning interventions. Using a Type IV control group method as defined by Wang (2002), the study empirically analyzed and measured the learning effectiveness and the business impact of an e‐learning system implemented in General Electric Company. The e‐learning system under study demonstrated significant economic returns in regard to reduced learning response time and reduced project cycle time. The study shows that e‐learning, as a means of technology‐based HRD intervention, can be highly effective as a performance support learning mechanism, although the results also suggest that e‐learning alone is not sufficient to replace the traditional face‐to‐face learning platforms. 相似文献