Acute effects of a caffeine-containing supplement on bench press and leg extension strength and time to exhaustion during cycle ergometry.
Study Goal
The researchers aimed to determine the acute effects of a caffeine-containing supplement on strength (1RM bench press and leg extension) and endurance (time to exhaustion during cycling) in untrained men.
Results Summary
The study found that the caffeine-containing supplement had no significant effect on 1RM bench press strength, 1RM leg extension strength, or time to exhaustion at 80% VO2peak. The results did not support the use of the supplement as an ergogenic aid in untrained individuals.
Population
21 untrained men (mean age 23.0 ± 2.6 years).
Effective Dosage
400 mg caffeine (single dose).
Duration
Acute (60 minutes post-ingestion).
Interactions
None mentioned.
| Intervention | Direction | Endpoint | Population | Dosage | Impact | Claim # |
|---|---|---|---|---|---|---|
a caffeine-containing supplement (SUPP) | no change | 1RM bench press strength | untrained men | no significant change | had no effect | #1 |
a caffeine-containing supplement (SUPP) | no change | 1RM leg extension strength | untrained men | no significant change | had no effect | #2 |
a caffeine-containing supplement (SUPP) | no change | time to exhaustion (TTE) during cycle ergometry at a power output that corresponded to 80% of VO2peak | untrained men | no significant change | had no effect | #3 |
The purpose of the present study was to examine the acute effects of a caffeine-containing supplement (SUPP) on 1 repetition maximum (1RM) bench press and leg extension strength, as well as time to exhaustion (TTE), during cycle ergometry at a power output that corresponded to 80% of VO2peak. The study used a double-blinded, placebo-controlled, crossover design. Twenty-one untrained men (mean +/- SD age = 23.0 +/- 2.6 yr) were randomly assigned to take either the SUPP or placebo (PLAC) first. The SUPP contained 400 mg of caffeine, 66.7 mg of capsicum extract, 10 mg of bioperine, and 40 mg of niacin, and the PLAC was microcrystalline cellulose. Sixty minutes after taking either the SUPP or PLAC, the subjects were tested for 1RM bench press and leg extension strength, as well as TTE. After 1 week of rest, the subjects ingested the opposite substance (SUPP or PLAC) and were retested for 1RM bench press and leg extension strength, as well as TTE. The results indicated that the SUPP had no effect on 1RM bench press strength, 1RM leg extension strength, or TTE at 80% VO2peak. These findings did not support the use of the caffeine-containing SUPP in the present study as an ergogenic aid in untrained individuals.