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Acute Effects Of Custom Orthotics On Sprint Power And Steady State Cycling

2017; Lippincott Williams & Wilkins; Volume: 49; Issue: 5S Linguagem: Inglês

10.1249/01.mss.0000518506.32534.56

1530-0315

Allan H. Goldfarb, Alex Ehlert, Kerry J. Martin, Michael Rigby,

Diabetic Foot Ulcer Assessment and Management

Orthotic insoles are used to correct foot and knee position for better mechanics of movement and acute orthotic use in runners reported improved economy. However, acute usage of customized orthotics (O) have not been evaluated acutely in competitive cyclists. PURPOSE: The purpose of this study was to examine the acute effects of custom insoles on steady-state (SS) cycling physiological variables as well as sprint power output. METHODS: Eight competitive cyclists (6 males, 2 females) performed four bouts of cycling at 65-70% VO2max for 10 min (two trials with standard insoles (S) and two with O) in randomized order. SS cycling VO2, heart rate (HR) and respiratory exchange ratio (RER) were evaluated in minutes 2-7. In addition, peak power was determined to two 6 sec sprints 30 seconds apart at the end of SS bout on a Lode cycle ergometer. A repeated-measures ANOVA with an a priori alpha level of 0.05 was used to compare the differences in O vs S using SPSS. RESULTS: Steady state %VO2 (S=66.70±1.33; O=67.13±1.41) HR bpm (S= 151.6±2.29; O=153.6 ±2.33; RER (S=.91±0.02; O=.90±0.01) with no difference with condition (p = > .6). Peak power was also not significantly different (S= 1109±54.9; O=1115± 47.6 W) in the sprints. CONCLUSION: Acute use of custom orthotics did not alter VO2, HR or RER during steady state cycling nor peak power. It is suggested that follow-up to orthotic usage should be analyzed as it usually takes time (several weeks) to alter the mechanics with orthotic usage.