Dietary Supplements

Effects of an 8-week liquid protein supplementation on resistance training adaptations in untrained healthy college students.

TL;DR

Post-exercise liquid protein supplementation enhanced resistance training adaptations in chest circumference and maximal strength (bench press and squat) compared to resistance training alone in untrained college students over 8 weeks.

Key Findings

Liquid protein supplementation post-exercise produced greater increases in maximal bench press strength compared to resistance training alone.

  • Mean difference in bench press improvement: 16.00 kg (RTE + protein) vs 8.93 kg (RTE control)
  • Difference between groups was statistically significant (P = 0.007)
  • 30 untrained male participants were randomized into two groups
  • Protein supplement was consumed post-exercise over 8 weeks of resistance training three times per week

Liquid protein supplementation post-exercise produced greater increases in maximal squat strength compared to resistance training alone.

  • Mean difference in squat improvement: 42.33 kg (RTE + protein) vs 27.32 kg (RTE control)
  • Difference between groups was statistically significant (P = 0.018)
  • Both groups performed resistance training exercises three times per week for 8 weeks
  • The RTE control group consumed water post-exercise as a comparator

Liquid protein supplementation produced greater chest circumference gains compared to resistance training alone.

  • Mean difference in chest circumference: 6.10 cm (RTE + protein) vs 3.36 cm (RTE control)
  • No specific p-value for chest circumference comparison was reported in the abstract
  • Measurement reflects change over the 8-week intervention period

Both groups showed increases in thigh circumference, muscle mass, and maximal bench press and deep squat repetitions, but without significant between-group differences.

  • Increases in thigh circumference, muscle mass, and repetition-based performance were observed in both RTE + protein and RTE groups
  • No statistically significant differences were found between the two groups for these outcomes
  • Suggests resistance training alone is sufficient to drive some muscular adaptations in untrained individuals
  • Study population consisted of untrained healthy college students

The study design involved 30 untrained male participants randomized to protein supplementation plus resistance training or resistance training alone for 8 weeks.

  • Participants were randomized into two groups: RTE + protein and RTE (control)
  • Both groups performed resistance training three times per week for 8 weeks
  • The RTE + protein group consumed a liquid protein supplement post-exercise; the RTE group consumed water
  • Trial was registered with ChiCTR under registration number ChiCTR2300076750
  • Participants were described as untrained and healthy

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Citation

Liu Q, Guo Y, Fan D, Peng B, Wang J, Chen Z, et al.. (2026). Effects of an 8-week liquid protein supplementation on resistance training adaptations in untrained healthy college students.. PeerJ. https://doi.org/10.7717/peerj.20778