Dr. Gymbro
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#cycling

6 articles
A cyclist in profile, riding a sleek road bike along a quiet coastal road in warm golden-hour light, shot from a low side angle with a shallow depth of field. The rider wears a muted sage-green jersey, black bib shorts, a matte white helmet, and sunglasses. Their face shows calm, focused fatigue, with a faint sheen of sweat on the forearms. One hand is lifted slightly from the handlebars, holding a small, unbranded matte gel packet in soft cream and coral tones, just before opening it. The road curves gently behind them toward a hazy, softly blurred horizon of pale sea and distant hills, with long amber shadows stretching across the asphalt. In the foreground, slightly out of focus, a few gel sachets and a bike bottle rest on a weathered stone wall at the left edge of the frame, adding editorial depth. Fine dust and sunlight glow in the air. The palette is warm and restrained: butter yellow, soft peach, sage, and slate blue, with gentle film-like grain. The composition leaves open negative space in the upper right, a pale gradient sky, for headline overlay. The overall look is a modern, minimalist sports-science magazine photograph: natural, premium, and clean, with realistic textures, cinematic but understated color grading, and no text, logos, or graphics.
nutrition

Bikarbonátové gely během jízdy zvýšily výkon o 12 W ve 12‑minutovém závodě po tříhodinovém testu

BY DR. GYMBRO ·

Co kdyby nejvhodnější okamžik pro užití bikarbonátu nebyl před závodem, ale během něj? V náhodně křížové studii s 11 trénovanými cyklisty byly testovány gely obsahující bikarbonát a sacharidy během tříhodinové jízdy. Ve vyčerpaném stavu po jízdě byl výkon ve 12‑minutovém časovém závodě o 12 W vyšší než při čistých sacharidech a žaludeční potíže se nijak nelišily. Sprinty a dvouminutové úseky však významný přínos nepřinesly a vzorek byl velmi malý.
A wide editorial still life on a pale, warm-toned concrete surface in soft morning window light. In the center-left, a shallow matte ceramic bowl holds a small pile of bright red coffee cherries with glossy skins, a few sliced open to reveal pale mucilage and paired green-tan beans. Beside it, a small glass dish of fine, golden-brown powdered extract with a tiny wooden scoop resting on its edge. A sprig of coffee plant leaves, deep green and waxy, arcs across the foreground. On the right side, slightly out of focus, a sleek road cyclist's handlebar and a matte black water bottle lean against a light plaster wall, suggesting athletic training without showing a person. A minimalist analog stopwatch with a clean white face and thin black hands sits in the mid-ground, angled toward the camera, its hands paused near the fifteen-minute mark. A folded linen cloth in oatmeal beige and a single small espresso cup with a thin crema ring add quiet texture. The color palette is restrained and modern: cherry red, sage green, cream, soft terracotta, and charcoal accents. Light comes from the left, casting long, gentle shadows with a subtle warm glow and a hint of dust in the air. Shallow depth of field with crisp focus on the cherries and stopwatch, creamy bokeh in the background. Composition leaves open negative space in the upper right for a headline overlay. The overall feel is a clean, trendy health-and-science magazine cover: tactile, natural, minimal, and calm, shot in a 16:9 landscape frame with fine film-like grain and true-to-life tones.
nutrition

Extrakt z kávových třešní: 200 mg kofeinu zvýšilo výkon na kole o 4,6 %

BY DR. GYMBRO ·

Nízká dávka 200 mg kofeinu z celého extraktu z kávových třešní pomohla vytrvalostním cyklistům vyprodukovat o 4,6 % více práce během 15‑minutového časového testu. Přitom se nepodařilo prokázat, že tento extrakt urychluje doplňování glykogenu. Studie byla randomizovaná, dvojitě zaslepená a probíhala jako přechodná křížová studie na dvanácti cyklistů; financování zajišťovala firma z oboru. V článku se podíváme na to, co data ukazují, co nikoliv, a pro koho by mohl být tento doplněk zajímavý.
Wide landscape editorial photograph of a mountain biker mid-ride on a dusty red-orange singletrack trail in the South African Western Cape, golden hour light raking across the scene. The rider is in sharp focus on the right third of the frame, wearing a weathered cycling kit with a race number plate on the handlebars, dust kicking up from the rear tire. Behind them, rolling hills covered in fynbos shrubland and silhouetted protea plants fade into soft, hazy blue mountains. Warm amber sunlight creates long shadows and a soft rim light around the rider and bike. In the lower left foreground, slightly out of focus, a small minimalist glass vial and a clear water bottle sit on a flat sun-bleached rock, with a few drops of liquid catching the light. Next to them, a simple matte paper notecard and a pencil suggest data collection, with no legible text. The vial and bottle are clean, understated, and modern, with no branding. The color palette is earthy and refined: terracotta, ochre, sage green, dusty teal sky, and cream highlights. The composition uses shallow depth of field, a generous negative space in the upper left sky for headline overlay, and subtle film grain. The mood is contemplative, skeptical, and quietly sophisticated, like a feature photograph from a high-end outdoor sports and science magazine. Natural, candid, cinematic, shot on a 50mm lens with soft contrast and muted saturation. No futuristic elements, no glowing effects, no molecular graphics, no text.
science research

Ketone IQ zvýšil hladinu ketonů na Cape Epic, ale nic dalšího

BY DR. GYMBRO ·

Jezdci na osmidení závodě Cape Epic pili Ketone IQ dvakrát denně a dosahovali zhruba 1 mM ketonů v krvi, ale jejich únava, srdeční frekvence, reakční čas a regenerace vypadaly stejně jako u jezdců na placebem. Dvojitě zaslepená studie testovala R‑1,3‑butanediol v reálných závodních podmínkách, nikoli v laboratoři. Autoři konstatovali, že mírná ketóza nebyla účinná a že butanediol nesmí být zaměňován s ketónovými estery. Studie zahrnovala jen 18 účastníků, takže má omezenou sílu, ale poskytuje cenný datový bod pro každého, kdo uvažuje o drahém ketónovém nápoji pro regeneraci.
A cyclist in mid-ride, photographed from a low three-quarter side angle on a quiet country road at golden hour, wearing a matte navy jersey and a white helmet, with soft warm light catching the sweat on his forearms. His expression is calm and focused. The road bends gently through rolling green fields, and the background is softly blurred with creamy bokeh. In the foreground on the left, a styled flat-lay-inspired still life sits on a weathered wooden surface and blends into the scene. It includes two clear water bottles with pale citrus-tinted liquid, a few torn energy gel packets in muted coral and sage, and a small pile of dried apricots and sliced banana. A handful of glossy orange slices adds a bright accent. The shallow depth of field keeps the cyclist sharp in the middle distance while the foreground items are gently softened. The color palette is warm and editorial: soft peach, muted terracotta, sage green, cream, and deep navy. The light is natural and golden, with long, gentle shadows and a slight film-grain texture, like a high-end lifestyle or sports-science magazine spread. The composition follows the rule of thirds, with the cyclist on the right third and open negative space in the upper left, suitable for headline overlay. The mood is energetic yet thoughtful, clean and modern, and the photograph feels authentic rather than staged. There are no logos, no readable text, and no futuristic or sci-fi elements. The overall look is crisp, airy, and refined, in the style of a contemporary health and performance journal cover.
nutrition

100 g sacharidů za hodinu udrželo cyklisty rychlejšími – glykogen nebyl příčinou

BY COACH RYAN ·

Čtyři hodiny po náročném kole byli cyklisté, kteří doplňovali 100 g sacharidů za hodinu, méně únavní než ti, kteří užívali 60 g. Překvapivě byl svalový glykogen téměř stejný. Randomizovaná dvojitě zaslepená crossover‑studie na 15 trénovaných mužích naznačuje, že efekt spočívá v něčem jiném než v úspoře glykogenu.
A landscape editorial photograph in soft natural morning light. In the foreground on a rustic light oak table, a small cluster of fresh Rhodiola rosea plants with thick succulent blue-green leaves and tiny golden-yellow flower clusters rests beside a few dried, knobby amber-brown rhizome pieces. A matte ceramic cup of pale golden herbal tea sits beside them, with a thin curl of steam and a small linen cloth. The plants and roots are sharp, with fine texture and dewy highlights. In the softly blurred background, a lean cyclist in a fitted charcoal jersey stands beside a road bike on a quiet country lane at sunrise. Rolling green hills fade into pale mist behind them, and warm light rims the rider's shoulders. The cyclist tightens a glove, calm and focused, in a pre-ride moment of preparation. A water bottle is mounted on the bike frame, and a simple analog stopwatch with a brushed metal casing lies on the table near the herbs, hinting at timed effort. The palette is muted and modern: sage green, warm cream, soft gold, and slate gray, with gentle peach tones from the sunrise. Shallow depth of field, a clean, airy composition with generous negative space on the right third for headline text, and subtle film grain. The mood is calm, health-conscious, and quietly athletic, like a premium wellness and sports science magazine cover. No text, no logos, no futuristic elements.
science research

Rhodiola Rosea: Pre‑workout bez stimulantů pro náročný kardio?

BY DR. GYMBRO ·

V rámci křížového testu z roku 2013 se ukázalo, že jednorázová dávka 3 mg/kg Rhodioly rosea podaná hodinu před šesti mílovým cyklistickým časovým úsekem zkrátila čas z 25,8 na 25,4 minuty. Tepová frekvence během rozcvičky klesla z 140 na 136 tepů za minutu a vnímaná námaha z 6,6 na 6,0. Zisk je malý – zhruba 1,5 % – a pochází pouze ze 18 účastníků, takže se nejedná o zázrak. Přesto nižší vnímaná zátěž činí z Rhodioly zajímavou stimulantně‑volnou možnost pro vytrvalostní sportovce. Níže shrnujeme, co data ukazují a jak ji rozumně vyzkoušet.
A cyclist's legs mid-pedal on a stationary road bike, shot in a bright, airy, minimalist studio with a soft warm-grey backdrop. In the foreground on a pale oak table sits a small ceramic dish holding four deep coral-red softgel capsules, with a few translucent droplets of red-orange oil glistening beside them. Beside the dish is a sprig of dried red microalgae-toned seaweed and a halved wild salmon fillet, its coral flesh echoing the capsule color. Behind the table, slightly out of focus, a cyclist in a fitted charcoal jersey and matte black shorts rides a bike on an indoor trainer. Only the torso and legs are visible, with no face. A white towel hangs over the handlebars and a clear water bottle catches the light. Soft diffused morning light streams from a large window on the left, creating long gentle shadows and a subtle golden-hour glow on the skin and the glossy capsules. The palette is restrained and editorial: warm cream, sand, soft grey and charcoal, with vivid coral-red as the single accent color. A minimalist analog stopwatch with a clean white face sits on the table, its hands near the 85-minute mark. A thin, elegant line-graph shape is subtly suggested by a curved strip of red ribbon lying on the table, rising from left to right to hint at the performance gain without any text. The composition follows the rule of thirds, with the capsules and stopwatch in the lower left and the cyclist's motion-blurred legs sweeping across the right. Shallow depth of field, crisp macro detail on the capsules, and a fine film-like grain. The overall feel is a modern health and science magazine cover: clean, calm, sophisticated, and natural, with negative space in the upper area for a headline. There are no futuristic elements, no glowing effects, no laboratory equipment, and no text or logos. Landscape 16:9 format.
nutrition

Astaxanthin po 4 dnech prodloužil čas do vyčerpání na kole z 72 na 85 minut v malé studii

BY DR. GYMBRO ·

Čtyři dny suplementace astaxanthinem (28 mg denně) prodloužily čas do vyčerpání na kole z přibližně 72 na 85 minut – nárůst o 18 %. Současně se po intenzivní jízdě při 75 % VO₂max snížily hladiny markerů poškození svalů (CK, LDH) a lipidové peroxidace (MDA). Nažalost nebyly pozorovány významné změny v zánětlivých markerech ani ve využívání paliva, takže přesný mechanismus zůstává nejasný. Navíc použité dávkování je vyšší než v běžně dostupných doplňcích a studie zahrnovala pouhých deset mladých mužů.

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