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.
Studieöversikt
Status
Betingelser
Intervention / Behandling
Studietyp
Inskrivning (Faktisk)
Fas
- Inte tillämpbar
Kontakter och platser
Studieorter
-
-
Alabama
-
Auburn, Alabama, Förenta staterna, 36879-5432
- School of Kinesiology
-
-
Deltagandekriterier
Urvalskriterier
Åldrar som är berättigade till studier
- Vuxen
Tar emot friska volontärer
Beskrivning
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
Hur är studien utformad?
Designdetaljer
- Primärt syfte: Behandling
- Tilldelning: Icke-randomiserad
- Interventionsmodell: Crossover tilldelning
- Maskning: Dubbel
Vapen och interventioner
Deltagargrupp / Arm |
Intervention / Behandling |
|---|---|
|
Experimentell: 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
Andra namn:
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.
Andra namn:
|
|
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
Andra namn:
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.
Andra namn:
|
Vad mäter studien?
Primära resultatmått
Resultatmått |
Åtgärdsbeskrivning |
Tidsram |
|---|---|---|
|
Lean mass
Tidsram: 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
Tidsram: 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
Tidsram: 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
Tidsram: 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)
|
Samarbetspartners och utredare
Sponsor
Studieavstämningsdatum
Studera stora datum
Studiestart (Faktisk)
Primärt slutförande (Faktisk)
Avslutad studie (Faktisk)
Studieregistreringsdatum
Först inskickad
Först inskickad som uppfyllde QC-kriterierna
Första postat (Faktisk)
Uppdateringar av studier
Senaste uppdatering publicerad (Faktisk)
Senaste inskickade uppdateringen som uppfyllde QC-kriterierna
Senast verifierad
Mer information
Termer relaterade till denna studie
Nyckelord
Ytterligare relevanta MeSH-villkor
Andra studie-ID-nummer
- STUDY00000295
Plan för individuella deltagardata (IPD)
Planerar du att dela individuella deltagardata (IPD)?
IPD-planbeskrivning
Tidsram för IPD-delning
Kriterier för IPD Sharing Access
IPD-delning som stöder informationstyp
- STUDY_PROTOCOL
- SAV
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