Dr. Gymbro
Fitness General Nutrition Recovery Science & Research Trending: supplements sports nutrition creatine pre workout recovery
A wide, landscape editorial photograph shot from slightly above, showing a rustic matte-white ceramic bowl of dried tribulus terrestris, spiky star-shaped seed pods in warm tan and khaki tones, with a few fresh green trailing vines and tiny yellow flowers draped beside it. The bowl sits at the left third of the frame on a pale ash-wood table. Scattered nearby are two identical sets of plain, unlabeled amber supplement capsules, one pile slightly apart from the other, hinting at a placebo comparison. To the right, slightly out of focus, a worn leather rugby ball rests next to a chalk-dusted steel barbell plate and a folded charcoal-gray athletic towel. Soft diffused natural light streams in from a window on the left, creating gentle long shadows and a calm, clean atmosphere. The background is a muted sage-green and cream gradient with a shallow depth of field, leaving generous negative space on the right side for title overlay. A small, minimal notebook with a pencil and a simple balance scale made of brushed brass sits subtly in the midground, suggesting scientific scrutiny without any laboratory clutter. The color palette is earthy and refined: sage green, sand, warm amber, charcoal, and off-white. The style is modern lifestyle-magazine photography, crisp textures, subtle film grain, and a high-end wellness journal feel. The composition is balanced, uncluttered, and minimalist, with a quiet, thoughtful mood that conveys skepticism and evidence-based inquiry. No text, no logos, no people, no futuristic or sci-fi elements.
Science & Research

Tribulus Terrestris Gagal Ing Pemain Rugby Elite: Uji Coba 5 Minggu

Dr. Gymbro · · 3 min read
#supplements #strength training #creatine #tribulus terrestris #testosterone boosters #rugby #placebo controlled

Yen kowé mlebu ing lorong suplemen apa wae, bakal katon label Tribulus terrestris sing janji nambah kekuwatan lan otot kanthi cepet, mung 5 nganti 28 dina. Banjur, apa sing kedadeyan nalika para peneliti nyoba suplemen iki marang pemain rugby league elit sing lagi nglakoni latihan pra‑musim sing keras?

Ora ana apa‑apa. Ora ana bedane karo pil gula.

Panliten iki diterbitake ing Journal of Strength and Conditioning Research taun 2007 lan tetep dadi pangeling‑eling realistis kanggo sapa waé sing kepincut label “penambah testosteron alami”.

Klaim: Tambahan Gedhé Ing Wektu Sing Cendhak

Tribulus terrestris dipasarkan minangka suplemen herbal kanggo atlit lan pengangkat beban. Produsen ngaku suplemen iki bisa nambah kekuwatan lan massa otot tanpa lemak kanthi signifikan sajrone 5 – 28 dina. Kajaba iku, ana loro klaim sing asring muni:

  1. Ora bakal nyebabaké tes narkoba positif, mula aman kanggo atlit sing kena kontrol anti‑doping.
  2. Bisa nambah rasio urin testosteron/epitestosteron (T/E), sing ndadékaké risiko positif tes doping.

Peneliti banjur ngangkat loro pitakon utama: apa Tribulus pancen nambah kekuwatan lan otot, lan apa suplemen iki ngowahi rasio T/E sing bisa ngancam karir atlit?

Carane Panalitèn Dilakokaké

Desain uji coba iki cukup ketat kanggo mriksa klaim kasebut:

  • Tipe: Randomisasi, double‑blind, kontrol plasebo, desain pasang‑cocok.
  • Peserta: 22 pemain rugby league elit saka Australia (rata‑rata umur 19,8 ± 2,9 tahun, bobot 88,0 ± 9,5 kg).
  • Kelompok: 11 pemain nampa Tribulus terrestris; 11 pemain nampa plasebo.
  • Dosis: 450 mg ekstrak Tribulus saben dina, dikonsumsi sak wancik.
  • Durasi: 5 minggu.
  • Latihan: Kabeh pemain nglakoni program latihan tahanan abot sing terstruktur minangka bagéyan persiapan pra‑musim klub.

Para peneliti ngukur kekuwatan otot, komposisi awak (kalebu massa tanpa lemak), lan rasio urin T/E sadurungé lan sawisé periode suplementasi.

Hasil: Kabeh Dadi Luwih Kuat, Tribulus Ora Mbantu

Kekuwatan lan massa tanpa lemak nambah sacara signifikan sajrone lima minggu. Nanging, loro kelompok — sing nampa Tribulus lan sing nampa plasebo — padha nambah, lan ora ana bedane statistik antara loro kelompok.

Artiné, kenaikan kuwi asalé saka program latihan abot, ora saka kapsul. Pemain sing mung mangan pil gula (plasebo) entuk manfaat sing padha karo sing ngombe ekstrak herbal. Penulis nyimpulaké yèn Tribulus terrestris ora ngetokaké kenaikan gedhé ing kekuwatan utawa massa otot tanpa lemak kaya sing dijanjèkaké produsen.

Pertanyaan Doping: Ora Ana Perubahan Rasio T/E

Bab penting kanggo atlit sing kena tes anti‑doping yaiku rasio urin T/E. Panliten nemokaké yèn rasio iki ora nuduhaké bedane antar kelompok. Mula, ing konteks iki Tribulus ora nambah risiko tes positif miturut wates 4 : 1 sing ditetepaké World Anti‑Doping Agency (WADA).

Informasi iki nyenengaké saka sudut pandang kepatuhan, nanging ora ateges suplemen iki aman saka kontaminasi. Kontaminasi suplemen dadi masalah tersendiri sing ora dadi fokus panliten iki.

Watesan Sing Perlu Dikenal

Ilmu pengetahuan sing becik kudu transparan bab apa sing ora bisa dijawab. Panliten iki nduwèni sawetara watesan:

  • Sampel cilik: Mung 22 atlit (11 saben kelompok). Ukuran sampel iki bisa ora cukup kanggo ndeteksi efek sing alus.
  • Dosis tunggal: 450 mg/hari saka siji ekstrak sing diuji. Dosis utawa formulasi liya ora dianalisis.
  • Durasi cendhak: Lima minggu iku wektu singkat, sanajan cocog karo jendela wektu sing dijanjèkaké produsen.
  • Populasi khusus: Pemain rugby pria enom, elite, lan wis terlatih keras. Asil bisa béda kanggo atlit sing luwih tuwa, wanita, utawa sing ora terlatih.
  • Konteks latihan keras: Stimulus latihan sing kuat bisa nutupi efek suplemen sing cilik.

Sanajan klaim sing diuji yaiku kenaikan gedhé ing sawetara minggu, panliten iki ora nemokaké pratandha apa-apa sing ndhukung klaim kuwi.

Apa Tegese Iki Kanggo Kowe

  • Dosis lan wektu: 450 mg/hari Tribulus selama 5 minggu ora menehi keuntungan dibandhingake plasebo. Ora ana rekomendasi dosis adhedhasar panliten iki.
  • Sapa sing isih penasaran: Sapa wae sing kepincut label “penambah testosteron alami” kudu ngerti yèn bukti ilmiah saka panliten iki ora ndhukung janji kenaikan kekuwatan utawa otot.
  • Sapa sing kudu nglewati: Yen tujuanmu nambah kekuwatan, massa otot, utawa performa, luwih becik ngentekaké dhuwit kanggo alternatif sing wis kabukten.
  • Panggonan sing luwih becik kanggo duwitmu:
    • Creatine kanggo ndhukung kekuwatan, daya, lan massa tanpa lemak.
    • Protein kanggo nyukupi target asupan harian kanggo perbaikan lan pertumbuhan otot.
    • Program latihan tahanan terstruktur, turu sing cukup, lan asupan kalori sing cukup.

Kaya sing dituduhaké panliten iki, latihan abot sing konsisten iku faktor paling utama. Loro‑loro kelompok dadi luwih kuat lan nambah massa tanpa lemak tanpa pitulungan saka ekstrak herbal.

Intiné

Ing uji coba double‑blind karo 22 pemain rugby league elite, 450 mg/hari Tribulus terrestris sajrone lima minggu ora ngetokaké keuntungan apa wae dibandhingake plasebo kanggo kekuwatan, massa tanpa lemak, utawa rasio T/E. Amarga mung siji dosis sing diuji lan sampel cilik, iki dudu tembung pungkasan, nanging cukup kanggo curiga marang hype sing ngubengi suplemen iki. Simpen dhuwitmu kanggo barang sing wis kabukten efektif.

Original study

Read the original research on pubmed.ncbi.nlm.nih.gov →

This article summarizes published research for general information. It is not medical advice.

Share XFacebookLinkedInRedditWhatsApp
DG

Written by

Dr. Gymbro

Dr. Gymbro writes for Dr. Gymbro: science-backed fitness, nutrition & performance.

Related Articles

A modern editorial still life photographed from a slightly elevated angle on a pale, matte stone surface in soft natural window light. On the left, a heaping mound of fine white creatine monohydrate powder spills from a matte ceramic scoop, with a few crisp grains scattered across the surface. In the center, a small, minimalist amber glass capsule bottle sits tipped on its side, with a handful of off-white capsules spilling out. The label is blank and clean. On the right, a neat row of three clear glass lab-style vials rests on a slim oak tray. The vials hold different amounts of white powder: the first nearly empty, the second slightly fuller, the third filled almost to the brim. This quietly suggests the difference in dose and result. Beside the tray lies a simple stainless steel measuring spoon and a folded sheet of cream paper with soft, abstract bar-chart lines in muted sage green and terracotta. The lines are hand-drawn and unlabeled. Behind the objects, slightly out of focus, a lean athletic forearm in a gray linen sleeve rests on the edge of the surface, one hand loosely holding a matte shaker bottle. This hints at a training context without showing a face. A single sprig of eucalyptus in the corner adds a soft organic touch. The palette is warm neutral: bone white, oatmeal, soft sage, muted terracotta, and touches of amber. Shadows are gentle and long, with a shallow depth of field that gives creamy bokeh in the background. The mood is calm, clean, and trustworthy, like a premium health and science journal's feature spread, with generous negative space at the top and right for headline overlay. The composition is wide, balanced, and uncluttered, with subtle film-like grain and a natural, true-to-life color grade. No text, no logos, no futuristic elements.
nutrition

Label Dosis Kre‑Alkalyn Ora Nambah Kreatin Otot, Biopsi Ngandharake

BY DR. GYMBRO ·

Kre‑Alkalyn sing dibilas (buffered) ngaku nyerep luwih apik, dosis luwih sithik lan rasa kembung luwih sithik. Percobaan double‑blind ing Texas A&M mriksa klaim iki kanthi biopsi otot nyata saka 36 peserta sing dilatih 28 dina. Ing dosis label 1,5 g/saben dina, tingkat kreatin otot mung sethithik, dene kreatin monohidrat mundhak jelas. Kekuatan, komposisi awak lan efek samping ora nuduhaké keunggulan kanggo produk sing dibilas. Iki asil nomer‑nomer lan cara milih dosis kreatin sing bener.
A warm, softly lit modern home gym or sunlit studio, photographed in a clean editorial style. In the center-right of the frame, a silver-haired woman in her mid-60s with a calm, confident expression grips a matte black kettlebell at hip height. She wears a fitted sage-green athletic top and charcoal leggings. Her forearms and shoulders show lean, defined strength rather than bulk. Beside her, slightly out of focus, a man in his late 60s with short white hair and a trim beard performs a controlled bodyweight plank on a pale oak floor. In the foreground on the left, a minimalist wooden tray holds two small ceramic bowls. One contains fine white powder and the other holds a few cream-colored capsules. Next to them sit a glass of water with a lemon slice and a folded linen towel. A subtle scatter of powder dusts the tray. The foreground is shot with shallow depth of field and a creamy bokeh falloff. Behind them, tall windows pour in golden morning light, with long soft shadows across the floor. A potted fiddle-leaf fig and a stacked set of pastel-toned dumbbells on a low wooden shelf add texture. The wall is warm off-white plaster with a hint of terracotta in the corner. The palette is muted and modern: sage green, warm cream, soft terracotta, natural oak, and charcoal, with gentle highlights. The mood is quietly optimistic, focused, and grounded, suggesting strength, vitality, and measured scientific curiosity. The composition leaves clean negative space in the upper-left for a headline overlay. The look is a high-end wellness magazine cover with natural film-like grain, soft contrast, and crisp detail on the hands and kettlebell. There is no text, no logos, and no futuristic elements, only authentic, aspirational realism.
nutrition

Kreatin lan HMB Nggawé Wong 60‑an Luwih Kuat Sajrone 6 Minggu, Tanpa Nambah Massa Otot

BY DR. GYMBRO ·

Wong umur 60‑an sing njupuk kombinasi kreatin lan HMB dadi luwih kuat mung sajrone enem minggu, nanging massa otot ora nambah akeh. Uji coba double‑blind crossover karo 30 partisipan aktif nuduhaké peningkatan kekuatan sikil, pundhak lan lengan, plus daya tahan awak ndhuwur lan inti. Analisis regresi nerangaké yèn peningkatan iki ora gumantung marang ukuran otot, nuduhaké kemungkinan efek neuromuskuler. Sadurungé tuku suplemen iki, elinga yèn uji iki mung enem minggu, sampel cilik, lan komposisi awak diukur nganggo BIA. Kene apa sing ditemokaké, apa sing ora, lan cara maca asil iki.
Creatine Sakdurungé utawa Sawisé Latihan? Sétung Studi Cilik Nggawa Kauntungan Sawisé Latihan
nutrition

Creatine Sakdurungé utawa Sawisé Latihan? Sétung Studi Cilik Nggawa Kauntungan Sawisé Latihan

BY DR. GYMBRO ·

Sapa sing kudu njupuk creatine sakdurungé utawa sawisé ngangkat beban? Sétung studi taun 2013 karo 19 bodybuilder lanang nemokaké yèn dosis sawisé latihan ngungguli dosis sakdurungé ing massa tanpa lemak, massa lemak, lan bench‑press. Nanging uji statistik formal ora nemokaké bedané sing signifikan antarane grup, lan panulis mung ngandelaké inferensi “mbok menawa luwih migunani” kanthi ati‑ati. Kéné apa sing tenanan dituduhaké data, kenapa ukuran sampel penting, lan cara nerapaké temuan nganggo rutinitas 5 g saben dina sing prasaja.
A landscape, editorial-style flat lay photographed from above on a pale oak gym bench or a matte light-gray concrete surface. On the left side, a clear glass of water sits next to a small matte white ceramic bowl of fine white creatine powder, with a wooden scoop resting beside it and a few loose grains scattered naturally on the surface. In the center, a modern analog wall-style clock face is replaced by a simple minimalist stopwatch in brushed steel, its hands paused, subtly suggesting timing without any text or numbers emphasized. On the right, a neatly folded charcoal gym towel and a single chalk-dusted dumbbell handle enter the frame at the edge, with a faint dusting of white chalk on the wood. A small linen notebook with a pencil rests slightly off-center, its pages blank, hinting at data and study without any readable writing. The color palette is soft and restrained: warm cream, oatmeal, sage green, and muted slate, with one accent of terracotta orange in the pencil or a small ceramic dish. Light comes from a large window at the upper left, casting long, gentle diagonal shadows and a soft highlight across the glass of water, creating delicate caustic reflections on the surface. The depth of field is shallow, with the creatine bowl and scoop in crisp focus and the edges softly blurred. The composition leaves generous negative space on the upper right for a headline overlay. The overall feel is calm, clean, and contemporary, like a wellness and science journal's cover image, with natural textures, subtle film grain, and a refined, premium magazine look. No people, no logos, no text, and no futuristic elements.
nutrition

Creatine Sadurunge utawa Sawise Latihan? Studi Cilik Nggoleki Keuntungan Sawise Latihan

BY DR. GYMBRO ·

Apa sampeyan kudu njupuk creatine sadurunge utawa sawisé latihan beban? Sawijining studi 2013 sing melu 19 bodybuilder lanang nemokaké yèn dosis sawisé latihan bisa nambah massa bebas lemak lan bench‑press luwih akeh tinimbang dosis sadurunge, sanadyan beda kasebut ora signifikan sacara statistik. Artikel iki nerangaké apa sing sejatine dituduhaké data, kenapa ukuran sampel cilik dadi masalah, lan piye cara nggunakake temuan iki kanthi rutin 5 g saben dina.

This page is available in

English العربيةবাংলাČeštinaDeutschEspañolفارسیFrançaisHausaहिन्दीHrvatskiBahasa IndonesiaItaliano日本語Basa Jawa한국어NederlandsਪੰਜਾਬੀPolskiPortuguêsRomânăРусскийSrpskiTürkçeУкраїнськаTiếng Việt中文