Carbohydrate-Protein Drinks Do Not Enhance Recovery from Exercise-Induced Muscle Injury

Feb 15, 2008International journal of sport nutrition and exercise metabolism

Carbohydrate-protein drinks do not improve recovery after muscle injury from exercise

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Abstract

Consumption of carbohydrate (CHO) or carbohydrate-protein (CHO+PRO) beverages did not enhance recovery from exercise-induced muscle injury compared to a placebo (PLA).

Maximal isometric quadriceps strength was reduced by 20.6% immediately post-injury, 17.2% at 1 day, and 11.3% at 2 days compared to pre-injury.
Lower extremity muscle soreness peaked at 2 days post-injury, increasing from 3.1 mm to 54.0 mm.
Serum creatine kinase levels peaked at 1 day post-injury, rising from 138 U/L to 757 U/L.
No significant differences in recovery metrics were observed between the CHO, CHO+PRO, and PLA groups.

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This study examined the effects of carbohydrate (CHO), carbohydrate-protein (CHO+PRO), or placebo (PLA) beverages on recovery from novel eccentric exercise. Female participants performed 30 min of downhill treadmill running (-12% grade, 8.0 mph), followed by consumption of a CHO, CHO+PRO, or PLA beverage immediately, 30, and 60 min after exercise. CHO and CHO+PRO groups (n=6 per group) consumed 1.2 g x kg body weight(-1) x hr(-1) CHO, with the CHO+PRO group consuming an additional 0.3 g x kg body weight(-1) x hr(-1) PRO. The PLA group (n=6) received an isovolumetric noncaloric beverage. Maximal isometric quadriceps strength (QUAD), lower extremity muscle soreness (SOR), and serum creatine kinase (CK) were assessed preinjury (PRE) and immediately and 1, 2, and 3 d postinjury to assess exercise-induced muscle injury and rate of recovery. There was no effect of treatment on recovery of QUAD (p= .21), SOR (p= .56), or CK (p= .59). In all groups, QUAD was reduced compared with PRE by 20.6%+/-1.5%, 17.2%+/-2.3%, and 11.3%+/-2.3% immediately, 1, and 2 d postinjury, respectively (p< .05). SOR peaked at 2 d postinjury (PRE vs. 2 d, 3.1+/-1.0 vs. 54.0+/-4.8 mm, p< .01), and serum CK peaked 1 d postinjury (PRE vs. 1 d, 138+/-47 vs. 757+/-144 U/L, p< .01). In conclusion, consuming a CHO+PRO or CHO beverage immediately after novel eccentric exercise failed to enhance recovery of exercise-induced muscle injury differently than what was observed with a PLA drink.

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Carbohydrate-Protein Drinks Do Not Enhance Recovery from Exercise-Induced Muscle Injury

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