Abstract
This study investigated the effect of 1-week oral administration of propolis on
muscle fatigue and recovery after performing a fatigue task (total 100 maximal
voluntary concentric knee extension repetitions). In this placebo-controlled,
double-blind study, 18 young men consumed a formulation with high Brazilian
green propolis dose (H-BGP), a formulation with low Brazilian green propolis
dose, or a placebo, for 1 week before performing the fatigue task (an interval
between each intervention: 1–2 weeks). Maximal voluntary contraction
torque, central fatigue (voluntary activation and root mean square values of the
surface electromyography amplitude), and peripheral fatigue (potentiated triplet
torque) were assessed before, immediately after, and 2 minutes after the
fatigue task. Maximal voluntary contraction torque decreased immediately after
the fatigue task in all conditions (P<0.001); however, it recovered from
immediately after to 2 minutes after the fatigue task only in the H-BGP
condition (P<0.001). Furthermore, there was a significant decrease in
voluntary activation (P<0.001) and root mean square values of the
surface electromyography amplitude (P≤0.035) only in the placebo
condition. No significant difference was observed in the time-course change in
potentiated triplet torque between the conditions. These results suggest that
oral administration of propolis promotes muscle fatigue recovery by reducing
central fatigue.
Key words
brazilian green propolis - knee extensors - concentric contraction - potentiated triplet
torque - voluntary activation