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
Results
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
Results
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
Results
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
Results
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
Methods
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
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