Effects of Carbohydrates Versus Carbohydrates + Protein on Resistance Training Outcomes (CHO & PRO+CHO)
Higher energy and carbohydrate intakes have been hypothesized to enhance resistance training adaptations, yet empirical evidence remains mixed. This study investigated whether supplemental carbohydrate-energy intake improves muscle hypertrophy, strength, and fatigue resistance in resistance-trained men.
Twenty resistance-trained men completed a quasi-randomized, double-blinded, counterbalanced crossover trial. Participants consumed either a daily protein-only supplement (30 g protein, 4 g carbohydrate) or a daily protein-plus-carbohydrate supplement (30 g protein, 54 g carbohydrate) for 8 weeks each, followed by crossover, while continuing their habitual training and diet. Primary outcomes included lean mass (dual-energy x-ray absorptiometry), muscle thickness and cross-sectional area (ultrasound), back squat one-repetition maximum, knee extensor peak torque, and fatigue index.
The carbohydrate-protein supplement produced significantly higher daily energy and carbohydrate intake compared to the protein-only supplement, with no differences in protein intake, fat intake, or training volume. No significant between-condition differences were observed for any outcome. These results suggest that modest increases in carbohydrate-energy intake outside of an energy deficit are unlikely to meaningfully enhance muscle hypertrophy, strength, or fatigue resistance in trained men.
Studieoversikt
Status
Forhold
Intervensjon / Behandling
Studietype
Registrering (Faktiske)
Fase
- Ikke aktuelt
Kontakter og plasseringer
Studiesteder
-
-
Alabama
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Auburn, Alabama, Forente stater, 36879-5432
- School of Kinesiology
-
-
Deltakelseskriterier
Kvalifikasjonskriterier
Alder som er kvalifisert for studier
- Voksen
Tar imot friske frivillige
Beskrivelse
Inclusion Criteria:
- Male sex
- Aged 18-40 years
- BMI not exceeding 35 kg/m²
- Minimum of two years resistance training experience
- Resistance training frequency of at least four days per week
- No known allergy to whey protein supplements
Exclusion Criteria:
- Known cardio-metabolic disease (e.g., clinical obesity, diabetes, hypertension, heart disease)
- Any condition contraindicating participation in resistance training
- Known allergy to whey protein supplements
Studieplan
Hvordan er studiet utformet?
Designdetaljer
- Primært formål: Behandling
- Tildeling: Ikke-randomisert
- Intervensjonsmodell: Crossover-oppdrag
- Masking: Dobbelt
Våpen og intervensjoner
Deltakergruppe / Arm |
Intervensjon / Behandling |
|---|---|
|
Eksperimentell: CHO
Daily consumption of a whey protein and maltodextrin mixture providing 30 g protein, 54 g carbohydrate, and 2 g fat per 92 g serving for 8 weeks.
|
Daily consumption of a whey protein and maltodextrin mixture providing 30 g protein, 54 g carbohydrate, and 2 g fat per 92 g serving for 8 weeks
Andre navn:
Daily consumption of a whey protein blend providing 30 g protein, 4 g carbohydrate, and 2 g fat per 39 g serving for 8 weeks.
Andre navn:
|
|
Aktiv komparator: PRO
Daily consumption of a whey protein blend providing 30 g protein, 4 g carbohydrate, and 2 g fat per 39 g serving for 8 weeks.
|
Daily consumption of a whey protein and maltodextrin mixture providing 30 g protein, 54 g carbohydrate, and 2 g fat per 92 g serving for 8 weeks
Andre navn:
Daily consumption of a whey protein blend providing 30 g protein, 4 g carbohydrate, and 2 g fat per 39 g serving for 8 weeks.
Andre navn:
|
Hva måler studien?
Primære resultatmål
Resultatmål |
Tiltaksbeskrivelse |
Tidsramme |
|---|---|---|
|
Lean mass
Tidsramme: Baseline, 8 weeks (mid-point), 16 weeks (post)
|
Bone-free lean tissue mass according to Dual-energy X-ray absorptiometry (DXA)
|
Baseline, 8 weeks (mid-point), 16 weeks (post)
|
|
Mid-thigh muscle thickness
Tidsramme: Baseline, 8 weeks (mid-point), 16 weeks (post)
|
Change in lateral thigh muscle thickness (vastus lateralis and vastus intermedius)
|
Baseline, 8 weeks (mid-point), 16 weeks (post)
|
|
Back Squat One-Repetition Maximum
Tidsramme: Baseline, 8 weeks (mid-point), 16 weeks (post)
|
Change in back squat 1RM
|
Baseline, 8 weeks (mid-point), 16 weeks (post)
|
|
Knee Extensor Peak Torque
Tidsramme: Baseline, 8 weeks (mid-point), 16 weeks (post)
|
Change in knee extensor peak torque using isokinetic dynamometry
|
Baseline, 8 weeks (mid-point), 16 weeks (post)
|
Samarbeidspartnere og etterforskere
Sponsor
Studierekorddatoer
Studer hoveddatoer
Studiestart (Faktiske)
Primær fullføring (Faktiske)
Studiet fullført (Faktiske)
Datoer for studieregistrering
Først innsendt
Først innsendt som oppfylte QC-kriteriene
Først lagt ut (Faktiske)
Oppdateringer av studieposter
Sist oppdatering lagt ut (Faktiske)
Siste oppdatering sendt inn som oppfylte QC-kriteriene
Sist bekreftet
Mer informasjon
Begreper knyttet til denne studien
Nøkkelord
Ytterligere relevante MeSH-vilkår
Andre studie-ID-numre
- STUDY00000295
Plan for individuelle deltakerdata (IPD)
Planlegger du å dele individuelle deltakerdata (IPD)?
IPD-planbeskrivelse
IPD-delingstidsramme
Tilgangskriterier for IPD-deling
IPD-deling Støtteinformasjonstype
- STUDY_PROTOCOL
- SEVJE
Legemiddel- og utstyrsinformasjon, studiedokumenter
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