The Acute Effects of a Caffeine-Containing Supplement on Strength, Muscular Endurance, and Anaerobic Capabilities

The Acute Effects of a Caffeine-Containing Supplement on Strength, Muscular Endurance, and Anaerobic Capabilities


Widespread usage of caffeine may be attributed to its purported benefits regarding increased release of catecholaminesand calcium and ultimately improving contractility of skeletal muscle. In addition to increasing endurance performance, investigation into 6s wingate bouts and isometric contraction strength demonstrated positive effects in combination with caffeine intake. The current investigation aimed to examine the possible effects of caffeine on upper and lower-body strength, muscular endurance and anaerobic capabilities


Thirty-seven men with at least one year of resistance training experience and possessed similar age, weight and height characteristics. Peak and mean power was determined by 2 WAnTs and using a 24rest period, the individuals then performed tests for 1RM strength and endurance using leg extension and bench press exercises. The subjects were then divided into two groups, SUPP (n=17) or PLAC (n=20), both taking one dose of 3 tablets, containing either caffeine or microcrystalline cellulose. Approximately one hour afteringesting pills, the participants performed 2 WAnTs and a minimum of 24 hours later, another dosage was administered and again 1-hour post intake, LE and BP exercises were completed.

Analysis was conducted on these parameters; a significant increase was demonstrated only in BP 1RM with intake of the caffeine-containing supplement. Further comparison on LE 1RM, LE TOTV, BP TOTV, PP, and MP showed no effect between SUPP and PLAC. Though there was an almost significant increase on BP TOTV with a caffeine-containing supplement, ingestion of placebo exhibited a non-significant decrease.


Investigation may be required into a proposed dose-dependent response to caffeine, specifically assessing various forms of upper and lower-body anaerobic methods. Due to inter-individual responses to caffeine, proposing infrequent users may see a greater ergogenic effect at a certain dosage. These results opposed my current opinion in addition to the hypothesized effect but provided conceptual framework for incorporating caffeine into an exercise training regiment.


Proving evidence for increasing upper-body strength, practical application can be geared towards athletes, such as football players participating in the scouting combine, to gain slight improvements in similar performance assessments. Examination into doses above 6mg/kg is essential into gaining insight into the optimal dosage to elicit sufficient performance improvements. Lastly, future experimentation could establish a more defined mechanism in which caffeine acts upon.