Studies related to Aerobic Exercise and Marijuana

Acute Effects Of Marihuana Smoking On Maximal Exercise Performance

Effect Decrease
Trial Design Cohort
Trial Length 1-7 Days
Number of Subjects 12
Gender Both Genders
Age Range 18-29
Body Types Average
Notes for this study:
In healthy nonsmoking adults who inhaled marijuana (7mg/kg bodyweight of a product that was 1.7% THC) and then cycled until failure, the marijuana group cycled for 15.1+/-3.3m relative to control's 16.1+/-4.0 (6.2% reduction) despite VO2 max not being affected.

This study did not utilize a blinding procedure, instead having a no smoking control, and a 26% increase in heart rate was noted before exercise (this increase in heart rate persisted up until 80% of maximum effort, but at 90-100% maximum effort during exercise both groups were similar).

Blood pressure during exercise was lower with marijuana relative to control, and FEV1 was increased with marijuana.

The Effects Of Smoking Marihuana On Physical Performance

Effect Decrease
Trial Design Double blind
Trial Length 24 hours
Number of Subjects 20
Gender Male
Age Range 18-29
Body Types Average
Notes for this study:
In adults who reported marijuana usage, inhalation of marijuana (20-25 tokes to finish off 1.4g of marijuana, conferring 18.2mg THC) before exercise failed to influence power output as assessed by a grip strength test but was successful in reducing endurance performance on a cycling test by 25% when performance was being held at 170 BPM (heart rate).

At rest, diastolic blood pressure (by 15mmHg) and heart rate (from 73.7BPM to 105.8BPM) were increased with marijuana, with an apparent increase in systolic blood pressure as well. Blood flow appeared to be unaffected.
Funding issues for this study:
Funding was from the Medical Research Council of Ottawa (Canada)