The acute effects of a caffeine-containing supplement on strength, muscular endurance, and anaerobic capabilities.

What Was Tested

This randomized controlled trial looks at Caffeine.

The purpose of this study was to examine the acute effects of a caffeine-containing supplement on upper- and lower-body strength and muscular endurance as well as anaerobic capabilities.

Why It Was Studied

Thirty-seven resistance-trained men (mean +/- SD, age: 21 +/- 2 years) volunteered to participate in this study.

Following a minimum of 48 hours of rest, the subjects returned to the laboratory for the second testing session and were randomly assigned to 1 of 2 groups: a supplement group (SUPP; n = 17), which ingested a caffeine-containing supplement, or a placebo group (PLAC; n = 20), which ingested a cellulose placebo.

Who Took Part

The age groups tagged for this paper are adults, men only.

How the Study Was Run

The design is described as randomized, double-blind and placebo-controlled.

Because people in this Caffeine study were split into groups at random, differences between the groups are less likely to reflect who happened to join each one.

As a double-blind Caffeine study, the assignments were hidden from both participants and investigators until the end.

The comparison arm used a placebo, so changes seen with Caffeine could be set against what happens without it.

What Was Measured

Following a minimum of 48 hours of rest, the subjects returned to the laboratory for the second testing session and were randomly assigned to 1 of 2 groups: a supplement group (SUPP; n = 17), which ingested a caffeine-containing supplement, or a placebo group (PLAC; n = 20), which ingested a cellulose placebo.

PubMed files the paper under topics including Anaerobic Threshold, Caffeine, Central Nervous System Stimulants, Dietary Supplements, Exercise Test, Muscle Strength and Muscle, Skeletal.

What This Means in Plain Language

The paper is a randomized, double-blind and placebo-controlled study of Caffeine.

The publication is from 2006 (Journal of strength and conditioning research), a journal based in United States.

More context: all human trials.