Compared Effect of a Fruit Milk Shake With a Protein-Carbohydrate Supplement on Recovery After Resistance Exercise

Summary

The aim of this study is to assess the effect of ingesting a commercial carbohydrate and protein dietary supplement in powder form (P-CHO supplement) or a milk shake with skimmed milk, strawberries and banana (MS), after resistance exercise, in muscle damage, oxidative stress, inflammation and functional recovery. It is hypothesised if the ingestion of a milk shake with skimmed milk and fruit (strawberry and banana) has the same impact on markers of muscle damage, oxidative stress, inflammation and functional recovery induced by resistance exercise, as the intake of a commercial powder with the same CHO and protein amounts.

Fifteen adult athletes from the Portuguese Athletic Federation will complete 2 trials separated at least by 2 weeks. Alternate legs and drinks will be used in each trial and participants will be overnight-fasted. This study will have a single-blind, randomized, crossover, repeated-measures experimental design. In each trial, after warm-up, the eccentric peak torque of the knee joint extensors will be determined using an isokinetic dynamometer. After this, participants will complete an isokinetic exercise until exhaustion at a constant angular velocity of 60° • s-1. After the exhaustion protocol, athletes will perform again the peak torque determination. Immediately after, participants will drink the P-CHO supplement or MS during the first 2 h. Both drinks will contain 0.8-1.2 g carbohydrates • kg-1 • h-1 and 0.2-0.4 g protein • kg-1 • h-1. Twenty four and 48 h after the exhaustion protocol participants will return to the laboratory to repeat the peak torque determination. Blood samples will be collected before warming-up, immediately and 2 h after the last peak torque determination and 24 h and 48 h after. Serum samples will be analyzed for creatine kinase, lactate dehydrogenase, interleukine-6, protein carbonyls and total antioxidant status. The delayed onset muscle soreness, using a visual analogue scale, and girths will be measured at the same moments as blood sampling. Two-way repeated-measures ANOVA will be used for statistical analysis of the data.

Conditions

• Muscle Damage
• Inflammation
• Oxidative Stress
• Functional Recovery

Interventions

DIETARY_SUPPLEMENT

P-CHO supplement

In the first trial, this group will drink a protein (P)-carbohydrate (CHO) supplement and in the second trial the fruit milk shake.

DIETARY_SUPPLEMENT

Fruit Milk Shake

The fruit content of the milk shake will be 100 g of strawberry and the amount of banana necessary to guaranty 0.8-1.2 g CHO • kg-1 BW • h-1.

Sponsors & Collaborators

• Universidade do Porto

  lead OTHER

Principal Investigators

• José Soares, PhD · Faculdade de Desporto, Universidade do Porto

• Monica V. Sousa, BSc · Faculdade de Desporto, Universidade do Porto

• Vitor H Teixeira, PhD · Faculdade de Ciências da Nutrição e Alimentação, Universidade do Porto

Study Design

Allocation

RANDOMIZED

Masking

SINGLE

Model

CROSSOVER

Eligibility

Min Age

18 Years

Sex

MALE

Healthy Volunteers

Yes

Timeline & Regulatory

Start

2012-03-31

Primary Completion

2012-03-31

Completion

2012-05-31

Countries

• Portugal

Study Locations