Linde, K. van der (Kevin) (2015) Can power output and cadence influence the motor system redundancy in cycling? thesis, Sport Sciences.
Full text available on request.Abstract
It is well-known that the motor system is highly redundant and that a single motor task can be executed in many ways (i.e. variation) with the same or similar end result. Electromyography (EMG) is widely used to assess muscle activity levels and variation. In cycling, there is a possible effect of power output and cadence on the muscle activity variation. The goal of this study was to examine if changing the cadence and power output can increase or reduce the number of ways the motor system can perform a single motor task (i.e. motor system redundancy), hence increase or reduce the muscle activity variation. Ten trained competitive cyclist, 9 men and 1 woman, were tested for nine trials consisting of three power outputs (2 W/kg, 3 W/kg and 4 W/kg body weight) and three cadences (70, 90, 110 Rounds Per Minute). EMG of eight lower limb muscles of the left leg were measured: gluteus maximus (GM), semitendinosus (SM), biceps femoris (BF), gastrocnemius medial head (GAS), soleus (SOL), rectus femoris (RF), vastus medialis (VM) and tibialis anterior (TA). Coefficient of variance (CV) was calculated, and principal component analysis (PCA) was performed for all trials and participants. CV values were used as dependent variables and power output and cadence as independent variables in a two-way factorial analysis of variance (ANOVA). CV showed a significant effect of cadence for TA activation variability, with decreasing levels of variation for increasing cadences. Further, no significant effects were found. The results indicate that the motor system uses different strategies, however, within a fixed activation pattern, i.e. muscle synergies, to meet the required cadence and power output and is not influenced by more demanding constraints (i.e. higher cadence and power output).
| Item Type: | Thesis (UNSPECIFIED) |
|---|---|
| Supervisor name: | Otten, B. |
| Faculty: | Medical Sciences |
| Date Deposited: | 12 Apr 2022 09:47 |
| Last Modified: | 12 Apr 2022 09:47 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/3097 |
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