Effects Of Whey Protein Timing On Muscle Hypertrophyin Healthy Males During 4-week Resistance Training
Qiu, Junqiang; Medicine & Science in Sports & Exercise: August 2021 - Volume 53 - Issue 8S - p 269
Whey protein can strengthen the recovery after exercise and promote muscle hypertrophy, howeverin different supplement timing, there will be an optimal supplement timing to achieve the best effect.
PURPOSE: The aim of the study was to observe whether whey protein timing had effects on muscle hypertrophy.
METHODS: Thirty-two healthy male college students were given whey protein (30 g Pro) or placebo (Pla) before and/or after resistance training (PLA: Pla + Pla, PPRO: Pro + Pla, APRO: Pla + Pro, BPRO: Pro + Pro). In each training for four weeks, participants performed 4 sets × 10 repetitions barbell squat at 70% of their barbell back squat one-repetition maximum and completed three times training per week. Using DXA, contrast enhanced ultrasound and DAVID knee extension device to test body composition, muscle morphology and the strength of knee extension before and after 4-week training. CK were obtained 30 min before and 24 h after exercise in the first and last training session.
RESULTS: APRO and BPRO were significantly increased muscle mass (54.53 ± 4.64 vs. 58.54 ± 5.82 kg, 55.74 ± 4.09 vs. 58.75 ± 4.74 kg, respectively; p < 0.05). The rectus femoris thickness in APRO and BPRO had a significant increase in dominant leg after 4 weeks training (12.55 ± 3.94 vs. 16.71 ± 3.04 mm, 14.12 ± 2.23 vs. 15.91 ± 2.10 mm, respectively; p < 0.05). The strength of knee extension before and after training in APRO and BPRO increased by 14.2% and 15.2%, respectively (p < 0.05). After 4 weeks, CK in APRO and BPRO were significantly lower than other two groups 24 h after exercise (113.4 ± 87.6 U/L, 104.0 ± 80.7 U/L, 251.0 ± 165.6 U/L, 250.8 ± 120.0 U/L, respectively; p < 0.05).
CONCLUSIONS: Ingesting protein after or before and after exercise can better promote muscle growth and attenuate muscle damage, and ingesting protein before and after exercise has a better effect on muscle strength growth.