does weed affect sports performance

Does weed affect sports performance

Marijuana is an illegal drug produced from the dried leaves, stems, seeds and/or flowers of the hemp plant, cannabis sativa, that is usually smoked by the user. There are many slang terms for marijuana, including, pot, grass, weed and Mary Jane. “All forms of marijuana, including the stronger sensemilla and hashish varieties, are mind-altering (psychoactive) drugs,” says Wadler. “They all contain THC (delta-9-tetrahydrocannabinol), the main active chemical in marijuana that effects changes in the brain of the user.” Marijuana’s effects depend on the strength or potency of the THC, which is only one of more than 400 chemicals present in marijuana. Highly fat-soluble, THC and other related chemicals rapidly enter the brain and fat stores of the body.

What are the effects of marijuana on performance?

  • Impairs skills requiring eye-hand coordination and a fast reaction time
  • Reduces motor coordination, tracking ability and perceptual accuracy
  • Impairs concentration, and time appears to move more slowly
  • Skill impairment may last up to 24 to 36 hours after usage
  • Reduces maximal exercise capacity resulting in increased fatiguability
  • Marijuana has no performance-enhancing potential

Because marijuana is stored in the body fat, its effects may be long-lasting. “It has been shown that performance skills can be impaired for as long as 24 hours after marijuana usage,” says Wadler, “which casts doubt on the commonly held belief that the social use of marijuana the evening prior to an athletic event will not affect performance.”

What are the short-term adverse health effects of marijuana?

  • Memory and learning problems
  • Difficulty concentrating
  • Perception distortions involving vision, sound, touch and time
  • Thinking and problem-solving difficulties
  • Increased heart rate and drop in blood pressure
  • Sudden feelings of anxiety, including panic attacks, and paranoia
  • Runny nose, sore throat, wheezing

What are the long-term adverse health effects of marijuana?

“Because marijuana users often inhale the unfiltered smoke deeply and then hold it in their lungs as long as possible, chronic marijuana use may play a role in the development of chronic respiratory problems,” says Wadler. Animal studies have suggested that THC may adversely affect the immune system. Additionally, long-term use has been associated with motivational problems including apathy, impaired judgment, loss of ambition and an inability to carry out long-term plans.

Can marijuana be addictive?

Chronic marijuana use has been associated with the development of tolerance in which the user may have a tendency to increase the amount of marijuana used. “Physical and psychological dependence in frequent users is associated with signs and symptoms of withdrawal upon discontinuation,” according to Wadler. “These signs and symptoms begin about 10 hours after discontinuation and peak at 48 hours and include anxiety, insomnia, sweating, loss of appetite and craving for THC.” According to a report from the Substance Abuse and Mental Health Services Administration (SAMHSA), almost 196,000 people entering drug treatment programs reported marijuana as their primary drug of abuse, indicating that they needed help to stop using the drug.

Is marijuana included in drug testing in sports?

There is not a uniform policy regarding drug testing in either professional or amateur sports. “Though not explicitly banned by the International Olympic Committee (IOC)”, says Wadler, “a working group of the IOC has been formed to review and make recommendations about the use of marijuana in Olympic sports.” It is banned by the NCAA and various national governing bodies. Because of its high solubility in body fat, marijuana can be detected for as long as two to four weeks by current drug testing methods.

Does weed affect sports performance Marijuana is an illegal drug produced from the dried leaves, stems, seeds and/or flowers of the hemp plant, cannabis sativa, that is usually smoked by the

Cannabis in sport: a friend or a foe?

The Cannabis Act could lift the lid on research into cannabis as a performance-enhancing drug now that more athletes are opening up about using cannabis in sport.

The medical effects of cannabis in sport and exercise are largely unknown. Given developing attitudes towards the drug and change in legislation in many different countries, it is vital that more cannabis research is done in order to inform policy in both government and sports.

We continue to discover more about the endocannabinoid system since its discovery in the 1980s, and the question of whether cannabis in sport can be classed as an ergogenic or an ergolytic drug still rages. On the one hand, many believe ingesting the plant can improve performance, help athletes to focus and contribute to managing pain; on the other hand, some claim that using cannabis can decrease motivation – including the motivation to train or push oneself – decrease oxygen intake and decrease reaction times. However, the pharmacokinetics of the THC compound in particular can cause complications when studying the adverse analytic findings.

Cannabis has a long history with sports, and across the globe many top athletes have, and still do, turn to cannabis to help them focus on the moment, relax and aid recovery following sports injuries.

Research into cannabis in sport

The introduction of Canada’s Cannabis Act means that more research regarding cannabis in sport can now be conducted; however, several papers that discuss the effects of the drug during sports have already been published that can give us an insight into why athletes use cannabis and the effects it has on their performance. More research also needs to be done into the effects of the congestion of food stuffs containing traces of cannabinoids, such as CBD oils or energy balls, and whether this has any effects on athletes’ performance as opposed to smoking the plant or ingesting THC cannabis-based products.

A study conducted in France in 2002 showed that 1,152 sports students used cannabis during their training and sports activities in order to increase their sportive performance and showed that it was men who were much more likely to incorporate the use of cannabis into their sport activities. 1 Another study conducted in 2003 found: ‘As a whole, practising sports as an elite student‐athlete can be considered as correlated negatively with cigarette, alcohol and cannabis use. Nevertheless, this relationship depends on the kind of sport practised as well as the level of competition, and further research is needed to understand specific elite athletes’ motives for use’. 2

Published in the British Journal of Sports Medicine, a 2006 study looking at what was known at the time about cannabis in sport noted that: ‘Renaud and Cormier showed that marijuana smoking reduces maximal exercise performance; when 12 healthy young adults cycled to exhaustion 10 minutes after smoking, exercise duration decreased from 16 to 15 minutes.

Driving and piloting skills are also negatively affected and point to the dangers of cannabis exposure when high levels of alertness and quick reflexes are required, such as in automobile sports. Thus, it can be inferred from the psychological effects of marijuana that cannabis is effective only in allowing an athlete to relax and to escape from social pressures.’ 3

More recently, one of Canada’s most prominent brain injury experts, neurosurgeon Dr Charles Tator at Toronto Western Hospital’s Canadian Concussion Centre, noted he was hopeful that research into cannabis could benefit those suffering from post-concussion problems after it was announced that 100 NFL players would be taking part in a randomised, double-blind study into the effects of cannabis on those who have suffered such injuries.

Anti-doping agencies and regulations in sports

As governments relax policy around cannabis some sport bodies are also taking a more progressive and relaxed attitude towards athletes using the drug in their respective sports – namely, USA Basketball BIG3, the NHL, and Major League Baseball. However, some cases of use in sport still result in a suspension, sometimes of up to two years, if found in the system.

Controversy over the detection of cannabis compounds in urine is a matter for consideration regarding regulation considering both THC and CBD can be detected in the urine of regular users for anything from four weeks to three months since their last use of the drug: ‘Quantitation of carboxy‐THC in urine alone cannot predict time of last marijuana use or suggest any relation between urine concentration and psychomotor effects.’ 3

The World Anti-Doping Agency (WADA) has included cannabis on their Prohibited List, saying that it is a performance-enhancing drug, a potential health risk and a violation of the spirit of sport. However, others say that the drug only enhances performance in the same way a healthy diet does – it is not the same as injecting something that can increase muscle mass or enlarge red blood cells and therefore increase the amount of oxygen carried around the body.

Athletes turning to cannabis for medicine and enhanced performance

Cannabis has over 400 chemical entities – 60 of which are cannabinoid compounds which directly act on our neurotransmitter endocannabinoid system. The difference between these compounds, namely CBD and THC, and their effects on performance is a pressing matter for sports bodies, athletes and scientists; however, the amount of research and studies done into the different effects of these compounds is extremely limited.

Endocannabinoids regulate appetite, emotions and memory, and the analgesic properties of cannabis means that more athletes are turning to cannabis as an alternative to pain killers. Whilst some athletes have been using CBD-based products to aid recovery and relieve pain and stress, others use products high in THC in order to increase their focus and performance.

Cannabis also regulates fatigue and so can relieve physical and mental exhaustion, making it a go-to drug for athletes looking for relief from intensive training regimes. The option for athletes to consume edibles rather than smoke the plant also means they can reap the benefits without the harmful effects of smoking.

Several Canadian athletes have been embracing the healing properties of CBD for a number of injuries and ailments. Toronto-based Muay Thai fighter Angelina Musicco suffered injuries from competing and turned to cannabis after being prescribed numerous pain killers, and Montreal-based former mountain biker Phil Dépault did the same after being diagnosed with fibromyalgia, both launching their own cannabis-based products businesses that include edibles and topicals following their successful use of the plant for its medicinal properties.

In Canada and America, a number of sporting initiatives set up by amateur and professional athletes similarly aim to incorporate the use of cannabis in sport and training such as the 4/20 games, Cannafit and NORML Athletics.



Please note, this article will appear in issue 9 of Health Europa Quarterly, which will be available to read in April 2019.

The Cannabis Act could lift the lid on research into cannabis as a performance-enhancing drug now that more athletes are opening up about using cannabis in sport.