The Effect of Topical Analgesics on Maximum Contractile Strength

Topical analgesics contain menthol to reduce inflammation. Research has shown muscle function improvement after application of topical analgesics, with smaller muscle masses demonstrating greater improvement. The purpose of this study was to determine the effect of analgesics with differing properties on peak torque production during maximal concentric contractions of specific muscle masses differing in size. This study received approval from the Hanover College Institutional Review Board with regards to the use of human subjects. Methods: Five healthy males participated as subjects and each completed five trials. Trials included a pre and post no-treatment control (trials 1 and 5). Trials 2, 3, 4 were randomized and included application of Biofreeze, Bengay Ultra Strength or placebo gel. Each session involved maximal muscular tests performed on the Cybex isokinetic analyzer, including knee flexion/extension, wrist flexion/ extension, and pinch dynamometer tests. Topical dosage was determined per unit volume of muscle mass as follows: thigh dose = 7.5 +- 1 ml, forearm dose = 3.5 +- 1 ml and hand dose = 2.0 +- 0.5 ml. Testing was conducted five minutes post-application and peak torque was determined Results/Discussion: Data collection is ongoing at present. However, pilot data indicated that Biofreeze and Bengay produced an increase in the thigh (BF +4.5% and BG +17.5%) and wrist torques (BF +4.7% and BG +14.0%) compared to no-treatment. The placebo treatment showed no effect. Findings suggest an effect that is similar whether application is hot or cold, though heat has a greater effect