#guarana

1 article

A wide, softly lit editorial flat-lay on a pale warm-gray stone countertop, shot from slightly above. On the left, a small rustic ceramic bowl in matte cream holds a handful of dried guarana seeds, dark glossy brown with pale cream arils, a few spilling onto the surface. Beside it sits a halved fresh guarana fruit in vivid red-orange, split open to show the white flesh and black seed inside, looking like a tiny eye. On the right, two open clear capsules rest side by side. One is filled with fine white caffeine powder, the other with a fine earthy brown guarana powder, and a little of each dusts the stone in delicate, deliberate lines. Between them, a minimalist matte-black espresso cup with a thin ribbon of steam rises on the right edge of the frame. A brushed-steel stopwatch and a slim dark-green linen notebook with a pencil sit in the upper background, slightly out of focus, to hint at performance testing without clutter. A few green leaves of a guarana vine curve in from the top-left corner, catching soft light.

The lighting is natural window light from the left, with gentle long shadows and a subtle warm highlight on the seeds. The palette is muted and modern: warm creams, terracotta red, deep espresso brown, sage green, and charcoal accents. The background is clean with generous negative space on the upper right for headline text. Shallow depth of field, crisp focus on the seeds and capsules, fine grain, and a calm premium magazine look like a contemporary wellness and sports-science journal. No people, no text, no logos, no futuristic elements.

グアラナ vs カフェイン：同等用量でピークパワーを上げたのはグアラナだけ

BY DR. GYMBRO · 2026年10月22日

同等のカフェイン量（約5 mg/kg）で摂取した場合、グアラナカプセルだけが統計的に有意なピークパワー向上を示しました。18名の活動的な若年男性を対象にしたランダム化クロスオーバー試験では、グアラナはプラセボに対しピーク出力を約4 %上昇させたのに対し、無水カフェインは有意差を示しませんでした。ただし、グアラナとカフェインの直接比較では有意差は認められず、差は記述的に留まります。本稿では数値の詳細、研究の限界、そしてカフェイン含有量でのグアラナ摂取方法について解説します。