Limits...
The Reliability of Electromyographic Normalization Methods for Cycling Analyses.

Sinclair J, Taylor PJ, Hebron J, Brooks D, Hurst HT, Atkins S - J Hum Kinet (2015)

Bottom Line: Five minutes of submaximal cycling (180 W) were also undertaken, allowing the mean (DMA) and peak (PDA) activation from each muscle to serve as reference values.The results showed that EMG amplitude differed significantly between normalization techniques for all muscles, with the IMVC and MxDA methods demonstrating the highest amplitudes.The highest levels of reliability were observed for the PDA technique for all muscles; therefore, our results support the utilization of this method for cycling analyses.

View Article: PubMed Central - PubMed

Affiliation: Division of Sport, Exercise and Nutritional Sciences University of Central Lancashire.

ABSTRACT
Electromyography (EMG) is normalized in relation to a reference maximum voluntary contraction (MVC) value. Different normalization techniques are available but the most reliable method for cycling movements is unknown. This study investigated the reliability of different normalization techniques for cycling analyses. Twenty-five male cyclists (age 24.13 ± 2.79 years, body height 176.22 ± 4.87 cm and body mass 67.23 ± 4.19 kg, BMI = 21.70 ± 2.60 kg·m-1) performed different normalization procedures on two occasions, within the same testing session. The rectus femoris, biceps femoris, gastrocnemius and tibialis anterior muscles were examined. Participants performed isometric normalizations (IMVC) using an isokinetic dynamometer. Five minutes of submaximal cycling (180 W) were also undertaken, allowing the mean (DMA) and peak (PDA) activation from each muscle to serve as reference values. Finally, a 10 s cycling sprint (MxDA) trial was undertaken and the highest activation from each muscle was used as the reference value. Differences between reference EMG amplitude, as a function of normalization technique and time, were examined using repeated measures ANOVAs. The test-retest reliability of each technique was also examined using linear regression, intraclass correlations and Cronbach's alpha. The results showed that EMG amplitude differed significantly between normalization techniques for all muscles, with the IMVC and MxDA methods demonstrating the highest amplitudes. The highest levels of reliability were observed for the PDA technique for all muscles; therefore, our results support the utilization of this method for cycling analyses.

No MeSH data available.


Related in: MedlinePlus

The EMG reference amplitude for the gastrocnemius obtained as a function of each normalization technique both pre and post
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4519210&req=5

f3-jhk-46-19: The EMG reference amplitude for the gastrocnemius obtained as a function of each normalization technique both pre and post

Mentions: Tables 1–3 and Figures 1–4 show both the reliability of each normalization technique and the differences in the EMG amplitude as a function of the different methods for each of the examined muscles.


The Reliability of Electromyographic Normalization Methods for Cycling Analyses.

Sinclair J, Taylor PJ, Hebron J, Brooks D, Hurst HT, Atkins S - J Hum Kinet (2015)

The EMG reference amplitude for the gastrocnemius obtained as a function of each normalization technique both pre and post
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4519210&req=5

f3-jhk-46-19: The EMG reference amplitude for the gastrocnemius obtained as a function of each normalization technique both pre and post
Mentions: Tables 1–3 and Figures 1–4 show both the reliability of each normalization technique and the differences in the EMG amplitude as a function of the different methods for each of the examined muscles.

Bottom Line: Five minutes of submaximal cycling (180 W) were also undertaken, allowing the mean (DMA) and peak (PDA) activation from each muscle to serve as reference values.The results showed that EMG amplitude differed significantly between normalization techniques for all muscles, with the IMVC and MxDA methods demonstrating the highest amplitudes.The highest levels of reliability were observed for the PDA technique for all muscles; therefore, our results support the utilization of this method for cycling analyses.

View Article: PubMed Central - PubMed

Affiliation: Division of Sport, Exercise and Nutritional Sciences University of Central Lancashire.

ABSTRACT
Electromyography (EMG) is normalized in relation to a reference maximum voluntary contraction (MVC) value. Different normalization techniques are available but the most reliable method for cycling movements is unknown. This study investigated the reliability of different normalization techniques for cycling analyses. Twenty-five male cyclists (age 24.13 ± 2.79 years, body height 176.22 ± 4.87 cm and body mass 67.23 ± 4.19 kg, BMI = 21.70 ± 2.60 kg·m-1) performed different normalization procedures on two occasions, within the same testing session. The rectus femoris, biceps femoris, gastrocnemius and tibialis anterior muscles were examined. Participants performed isometric normalizations (IMVC) using an isokinetic dynamometer. Five minutes of submaximal cycling (180 W) were also undertaken, allowing the mean (DMA) and peak (PDA) activation from each muscle to serve as reference values. Finally, a 10 s cycling sprint (MxDA) trial was undertaken and the highest activation from each muscle was used as the reference value. Differences between reference EMG amplitude, as a function of normalization technique and time, were examined using repeated measures ANOVAs. The test-retest reliability of each technique was also examined using linear regression, intraclass correlations and Cronbach's alpha. The results showed that EMG amplitude differed significantly between normalization techniques for all muscles, with the IMVC and MxDA methods demonstrating the highest amplitudes. The highest levels of reliability were observed for the PDA technique for all muscles; therefore, our results support the utilization of this method for cycling analyses.

No MeSH data available.


Related in: MedlinePlus