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  Saturday, 08 March 2025 12:42

  ‘You get one split second’: The story behind a viral bird photo
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  By his own admission, James Crombie knew “very, very little” about starlings before Covid-19 struck. An award-winning sports photographer by trade, his only previous encounter with the short-tailed birds occurred when one fell into his fireplace after attempting to nest in the chimney of his home in the Irish Midlands.
  
  “I always had too much going on with sport to think about wildlife,” said Crombie, who has covered three Olympic Games and usually shoots rugby and the Irish game of hurling, in a Zoom interview.
  
  With the pandemic bringing major events to a halt, however, the photographer found himself at a loose end. So, when a recently bereaved friend proposed visiting a nearby lake to see flocks of starlings in flight (known as murmurations), Crombie brought along his camera — one that was conveniently well-suited to the job.
  
  “You get one split second,” he said of the similarities between sport and nature photography. “They’re both shot at relatively high speeds and they’re both shot with equipment that can handle that.”
  
  On that first evening, in late 2020, they saw around 100 starlings take to the sky before roosting at dusk. The pair returned to the lake — Lough Ennell in Ireland’s County Westmeath — over successive nights, choosing different vantage points from which to view the birds. The routine became a form of therapy for his grieving friend and a source of fascination for Crombie.
  
  “It started to become a bit of an obsession,” recalled the photographer, who recently published a book of his starling images. “And every night that we went down, we learned a little bit more. We realized where we had to be and where (the starlings) were going to be. It just started to snowball from there.”
  ‘I’ve got something special here’
  Scientists do not know exactly why starlings form murmurations, though they are thought to offer collective protection against predators, such as falcons. The phenomenon can last from just a few seconds to 45 minutes, sometimes involving tens of thousands of individual birds. In Ireland, starlings’ numbers are boosted during winter, as migrating flocks arrive from breeding grounds around Western Europe and Scandinavia.
  
  Crombie often saw the birds form patterns and abstract shapes, their varying densities appearing like the subtle gradations of paint strokes. The photographer became convinced that, with enough patience, he could capture a recognizable shape.
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  which one of the following Is not A potential danger of anabolic steroids?

  Saturday, 08 March 2025 12:26

  Performance-Enhancing Drugs
  
  
  
  # Performance-Enhancing Drugs
  
  ## Introduction
  Performance-enhancing drugs (PEDs) are substances used to improve
  physical and mental performance. They are widely sought after by athletes,
  bodybuilders, and individuals looking to enhance their capabilities beyond natural limits.
  This article explores the various types of PEDs, their prevalence, effects, risks, and clinical approach to addressing their
  use.
  
  ## Objectives
  To provide an overview of PEDs, their categories, physiologic effects, and the associated
  risks. To highlight the importance of education and clinical vigilance in identifying and managing PED use.
  
  
  
  ## Educational Gap
  There is a significant gap in understanding the types of PEDs,
  their mechanisms, and the long-term consequences of their use.
  
  Clinicians often lack comprehensive knowledge about the latest developments
  in PEDs, making it challenging to effectively address their impact.
  
  
  ## Performance-Enhancing Drugs
  
  ### Anabolic Agents
  Anabolic agents are designed to increase muscle synthesis and reduce fat storage.
  
  Examples include:
  - **Anabolic-Androgenic Steroids (AAS)**: Synthetic derivatives of testosterone that promote muscle growth and strength.
  
  - **Stimulants**: Caffeine, amphetamines, and other compounds that enhance alertness and energy.
  
  
  ### Steroid Precursors
  These are substances that can be metabolized into anabolic steroids.
  Examples include androstenedione and DHEA.
  
  ### Nutritional Supplements
  Highly purified products intended to enhance performance through
  physiological means, such as creatine and β-hydroxyβ-methylbutyrate (GH Bash).
  
  
  ## Epidemiology and Risk Factors
  The use of PEDs is prevalent in competitive sports, with rates varying by
  region and sport. Risk factors include:
  - Pressure to perform in sports or professions.
  - Desire for body image enhancement.
  - Availability and accessibility of these substances.
  
  
  ## Physiologic Effects
  PEDs can lead to both beneficial and harmful effects:
  
  - **Muscle Growth**: Promotes hypertrophy and strength.
  
  
  - **Performance Enhancement**: Improved endurance, speed, and energy levels.
  
  - **Adverse Effects**: Liver damage, hormonal
  imbalances, and cardiovascular issues.
  
  ## Prevalence of Use
  Surveys indicate that up to 10-20% of athletes use PEDs.
  The misuse is higher in individual sports compared to team sports.
  
  
  ## Administration
  PEDs are often administered in cycles, with the goal
  of avoiding detection. Methods include oral, intravenous, and
  subcutaneous routes.
  
  ## Testing
  Modern testing methods include urine and blood tests for detecting
  metabolites of AAS and other PEDs. Advanced techniques like mass spectrometry enhance
  accuracy.
  
  ## Adverse Effects
  Long-term use can result in severe health consequences, including:
  - Liver damage from oral steroids.
  - Cardiac arrhythmias from stimulants.
  - Infertility and hormonal imbalances from exogenous hormone use.
  
  
  ## Steroid Precursors
  These compounds are often used to avoid the negative side effects of AAS while
  maintaining performance benefits.
  
  ## Nutritional Supplements
  These products are generally considered safe
  but can be misused to mimic PED effects.
  
  ## History
  The use of Performance-Enhancing Drugs dates back to ancient times, with early references in Greek
  culture and the development of anabolic steroids in the mid-20th century.
  
  
  ## Clinical Approach
  ### Physical Examination
  - Look for signs of muscle wasting or fat accumulation.
  - Assess for potential side effects like acne, hair loss, and hypertension.
  
  ### Anticipatory Guidance
  Educate patients on the risks and potential legal consequences
  of PED use. Emphasize natural performance enhancement through diet, training, and recovery.
  
  
  ## Summary
  Performance-Enhancing Drugs offer temporary gains in performance but
  come with significant health risks. Clinicians must stay informed about new PEDs and their effects to provide effective guidance.
  Collaborating with athletes and educators can help reduce the misuse of these
  substances.
  
  ## Glossary
  - **Anabolic Agents**: Substances that promote muscle growth
  and fat loss.
  - **Steroid Precursors**: Metabolites that can be converted
  into anabolic steroids.
  - **Nutritional Supplements**: High-purity products designed
  to enhance performance.
  
  ## Footnotes
  1. National Institute on Drug Abuse (NIDA) provides resources on drug abuse and performance-enhancing substances.
  
  2. International Olympic Committee (IOC) guidelines outline
  testing policies for PEDs in sports.
  
  ## Suggested Reading
  - "Performance Enhancing Substances" by World Anti-Doping Agency (WADA).
  
  - "The Use of Anabolic Steroids in Athletes" by National Institute on Drug Abuse.
  
  
  ## References
  1. World Anti-Doping Agency. (2019). *The Use of Doping Agents: A Review*.
  
  
  2. National Institute on Drug Abuse. (2020). *Performance Enhancing
  Substances*.
  
  ## ACTIONS
  - **PERMALINK**: Link to the article or resource.
  - **RESOURCES**: Links to relevant databases and organizations, such as
  NCBI and WADA.
  - **Similar Articles**: A list of related articles on the
  topic.
  - **Cited by other articles**: References where this article is cited.
  
  
  
  ## Links to NCBI Databases
  - NCBI Database Link(https://www.ncbi.nlm.nih.gov/)
  
  ## Cite
  For citing this article, use the appropriate citation style (e.g.,
  APA, MLA).
  
  ## Add to Collections
  If applicable, add this article to a collection or list of resources.
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