斜槓青年 / 傻奧所思

THE ACUTE EFFECTS OF A CAFFEINE-CONTAINING SUPPLEMENT ON STRENGTH, MUSCULAR ENDURANCE, AND ANAEROBIC CAPABILITIES

https://pubmed.ncbi.nlm.nih.gov/16937961/

Travis W Beck  1 , Terry J Housh, Richard J Schmidt, Glen O Johnson, Dona J Housh, Jared W Coburn, Moh H Malek

PMID: 16937961 DOI: 10.1519/18285.1

*Acute effect

An acute effect is a physiological reaction in a human or animal body resulting in serious symptoms that develop rapidly during short-term (acute) exposure to toxic chemicals or substances. Symptoms are dangerous and severe but often subside after the exposure stops. In some instances, acute exposure can cause sickness, severe injury or even death within hours or days, although these instances are rare.

https://www.safeopedia.com/definition/211/acute-effect

*anaerobic

not needing or without oxygen

*Wingate Anaerobic Tests

The Wingate test is a cycle test of anaerobic leg power, conducted over 30 seconds. The test is also known as the Wingate Anaerobic Test (WANT), and was developed at the Wingate Institute in Israel during the 1970's.

The aim of this test is to measure the anaerobic power of the lower body.

https://www.topendsports.com/testing/tests/wingate.htm

是一篇針對上肢與下肢的力量、肌耐力、無氧能力與咖啡因補充劑的關聯之研究

受測對象為37位受過阻力訓練的男士志願者(平均21歲±2歲)

在第一次測試中

受試者進行了

→ 2次 Wingate Anaerobic Tests (WAnTs)

藉此得到了下肢力量的

peak power(PP)

mean power(MP)

也進行了

→ 1 repetition maximum(1RM), dynamic constant external resistance strength,

→ 雙邊腿屈伸(bilateral leg extension (LE)) 與 自由重量臥推(free-weight bench press (BP))的肌耐力測試 (muscular endurance (TOTV; total volume of weight lifted during an endurance test with 80% of the 1RM))

在受試者休息至少48小時後，進行第二次測試

並隨機分成兩組

○攝取咖啡因補充劑組(SUPP) 17名

○攝取安慰劑組(PLAC) 20名

在兩組攝取完1個小時後，進行測試

一樣進行

→ 2次 WAnTs

→ 1RM 力量測試

→ LE與BP的肌耐力測試

結果：

SUPP組在1RM有顯著的提升

PLAC則沒有

但 LE 1RM, LE TOTV, BP TOTV, PP, and MP. 則沒有效果

推測：攝取咖啡因可提升上肢能力，可對競技運動員有用

原文：

Abstract

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.

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

On the first laboratory visit, the subjects performed 2 Wingate Anaerobic Tests (WAnTs) to determine peak power (PP) and mean power (MP), as well as tests for 1 repetition maximum (1RM), dynamic constant external resistance strength, and muscular endurance (TOTV; total volume of weight lifted during an endurance test with 80% of the 1RM) on the bilateral leg extension (LE) and free-weight bench press (BP) exercises.

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.

One hour after ingesting either the caffeine-containing supplement or the placebo, the subjects performed 2 WAnTs and were tested for 1RM strength and muscular endurance on the LE and BP exercises.

The results indicated that there was a significant (p < 0.05) increase in BP 1RM for the SUPP group, but not for the PLAC group.

The caffeine-containing supplement had no effect, however, on LE 1RM, LE TOTV, BP TOTV, PP, and MP.

Thus, the caffeine-containing supplement may be an effective supplement for increasing upper-body strength and, therefore, could be useful for competitive and recreational athletes who perform resistance training.

Image by 5132824 from Pixabay