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THE EFFECT OF PEA AND RICE PROTEIN SUPPLEMENTATION ON MUSCLE RECOVERY

Abstract

PURPOSE: This study compares the effectiveness of pea and rice protein supplementation on muscle recovery following muscle-damaging exercise. METHODS: This cross-sectional, repeated-measures study involved seven healthy adults (5 female, 1 males; mean age: 22.2 ± 1.0 years) who completed three trials in a randomized order. Each trial consisted of a 3-day preloading phase, during which participants consumed their assigned supplement (0.4 g/kg body weight) daily. The supplements tested were pea protein (PS), rice protein (RS), or maltodextrin as a control (CN). Following the preloading phase, participants performed a muscle-damaging exercise, consisting of 30 minutes of downhill walking on a treadmill (AMTI, Watertown, MA) at a 20% decline and 1.36 m/s. Immediately after completing the exercise, capillary blood samples were collected to assess creatine kinase (CK) levels using a Piccolo Xpress analyzer (Abbott, Abbott Park, IL). Subsequent to blood collection, participants performed the knee extension strength tests on an isokinetic dynamometer (Human Norm, Stoughton, MA) to assess peak quadriceps muscle isometric torque. Neuromuscular activation of the vastus medialis was measured using an EMG sensor (Delsys, Natick, MA). The strength test was repeated after 1 hour of recovery to assess post-exercise recovery. Data were analyzed using repeated-measures ANOVA with Bonferroni-corrected post-hoc comparisons (p<0.05). RESULTS: There were no significant differences in CK levels between groups (RS: 114.7 ± 70.0 U/L, PS: 89.2 ± 48.3 U/L, CN: 90.3 ± 44.7 U/L, F(2,12) = 1.571, p = 0.247), nor in peak muscle extension torque (RS: 29.5 ± 27.9 nm, PS: 26.8 ± 29.5 nm, CN: 1.3 ± 24.23 nm, F(2,10) = 2.01, p = 0.184) or neuromuscular activation (RS: 36.8 ± 27.7 nm, PS: 32.3 ± 33.0 nm, CN: 13.8 ± 12.4 nm, F(2,8) = 1.47, p = 0.284). CONCLUSION: Pea and rice protein supplementation had no significant effect on muscle damage, peak force recovery, or neuromuscular activation following exercise under the conditions tested.

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