This blog may help people explore some of the 'hidden' issues involved in certain media treatments of environmental and scientific issues. Using personal digital images, it's also intended to emphasise seasonal (and other) changes in natural history of the Swansea (South Wales) area. The material should help participants in field-based modules and people generally interested in the natural world. The views are wholly those of the author.
Wednesday 15 February 2023
Wake Up!
Circa 2 billion cups of coffee are consumed by humans each day. The primary active ingredient is, of course, caffeine. Caffeine blocks the body's adenosine receptors. Adenosine binds to these receptors, to regulate heart rate, blood pressure and the sleep/wakefulness cycle. This binding results in physiological responses that decrease cellular activity, generally promoting drowsiness and sleep. By preventing adenosine binding to its receptor, caffeine increases alertness, allowing stimulatory neurotransmitters, like dopamine, to exert maximal effects (https://www.theguardian.com/food/2023/feb/15/the-truth-about-caffeine-how-coffee-really-affects-our-bodies). The amount of caffeine in a cup of coffee (or one of the plethora of caffeine-containing 'energy' drinks) is, of course, highly variable. There is no doubt, however, that coffee can boost athletic and other kinds of physical and mental performance. Timing is, of course, of prime importance. Most real (as distinct from placebo) activity is 10-45 minutes after ingestion.
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