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Muscle Fatigue in the Three Heads of the Triceps Brachii During a Controlled Forceful Hand Grip Task with Full Elbow Extension Using Surface Electromyography.

Ali A, Sundaraj K, Badlishah Ahmad R, Ahamed NU, Islam A, Sundaraj S - J Hum Kinet (2015)

Bottom Line: The root mean square values were then analysed to determine the fatiguing condition for the heads of triceps brachii muscle.The highest fatiguing rate was observed in the long head (slope = -2.863), followed by the medial head (slope = -2.412) and the lateral head (slope = -1.877) of the triceps brachii muscle.The results of the present study concurs with previous findings that the three heads of the triceps brachii muscle do not work as a single unit, and the fiber type/composition is different among the three heads.

View Article: PubMed Central - PubMed

Affiliation: AI-Rehab Research Group, Universiti Malaysia Perlis (UniMAP), Kampus Pauh Putra, Perlis, Malaysia.

ABSTRACT
The objective of the present study was to investigate the time to fatigue and compare the fatiguing condition among the three heads of the triceps brachii muscle using surface electromyography during an isometric contraction of a controlled forceful hand grip task with full elbow extension. Eighteen healthy subjects concurrently performed a single 90 s isometric contraction of a controlled forceful hand grip task and full elbow extension. Surface electromyographic signals from the lateral, long and medial heads of the triceps brachii muscle were recorded during the task for each subject. The changes in muscle activity among the three heads of triceps brachii were measured by the root mean square values for every 5 s period throughout the total contraction period. The root mean square values were then analysed to determine the fatiguing condition for the heads of triceps brachii muscle. Muscle fatigue in the long, lateral, and medial heads of the triceps brachii started at 40 s, 50 s, and 65 s during the prolonged contraction, respectively. The highest fatiguing rate was observed in the long head (slope = -2.863), followed by the medial head (slope = -2.412) and the lateral head (slope = -1.877) of the triceps brachii muscle. The results of the present study concurs with previous findings that the three heads of the triceps brachii muscle do not work as a single unit, and the fiber type/composition is different among the three heads.

No MeSH data available.


Related in: MedlinePlus

Change in the mean value of the normalized RMS values (expressed as a percentage of the initial value) obtained for the three heads of the TB during the 90 s period of isometric contraction
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f2-jhk-46-69: Change in the mean value of the normalized RMS values (expressed as a percentage of the initial value) obtained for the three heads of the TB during the 90 s period of isometric contraction

Mentions: Descriptive statistics for the mean, SD and CV% values of all subjects are presented in Table 1. Figure 2 shows the plot of mean values for each period (5 s) expressed as percentages of the initial period (1) values throughout the task duration and the corresponding linear regression slope during fatiguing period for each of the TB heads. Paired t-test significant values between the initial period (1) and the following periods (2–18) for the three heads of TB are presented in Table 2.


Muscle Fatigue in the Three Heads of the Triceps Brachii During a Controlled Forceful Hand Grip Task with Full Elbow Extension Using Surface Electromyography.

Ali A, Sundaraj K, Badlishah Ahmad R, Ahamed NU, Islam A, Sundaraj S - J Hum Kinet (2015)

Change in the mean value of the normalized RMS values (expressed as a percentage of the initial value) obtained for the three heads of the TB during the 90 s period of isometric contraction
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4519223&req=5

f2-jhk-46-69: Change in the mean value of the normalized RMS values (expressed as a percentage of the initial value) obtained for the three heads of the TB during the 90 s period of isometric contraction
Mentions: Descriptive statistics for the mean, SD and CV% values of all subjects are presented in Table 1. Figure 2 shows the plot of mean values for each period (5 s) expressed as percentages of the initial period (1) values throughout the task duration and the corresponding linear regression slope during fatiguing period for each of the TB heads. Paired t-test significant values between the initial period (1) and the following periods (2–18) for the three heads of TB are presented in Table 2.

Bottom Line: The root mean square values were then analysed to determine the fatiguing condition for the heads of triceps brachii muscle.The highest fatiguing rate was observed in the long head (slope = -2.863), followed by the medial head (slope = -2.412) and the lateral head (slope = -1.877) of the triceps brachii muscle.The results of the present study concurs with previous findings that the three heads of the triceps brachii muscle do not work as a single unit, and the fiber type/composition is different among the three heads.

View Article: PubMed Central - PubMed

Affiliation: AI-Rehab Research Group, Universiti Malaysia Perlis (UniMAP), Kampus Pauh Putra, Perlis, Malaysia.

ABSTRACT
The objective of the present study was to investigate the time to fatigue and compare the fatiguing condition among the three heads of the triceps brachii muscle using surface electromyography during an isometric contraction of a controlled forceful hand grip task with full elbow extension. Eighteen healthy subjects concurrently performed a single 90 s isometric contraction of a controlled forceful hand grip task and full elbow extension. Surface electromyographic signals from the lateral, long and medial heads of the triceps brachii muscle were recorded during the task for each subject. The changes in muscle activity among the three heads of triceps brachii were measured by the root mean square values for every 5 s period throughout the total contraction period. The root mean square values were then analysed to determine the fatiguing condition for the heads of triceps brachii muscle. Muscle fatigue in the long, lateral, and medial heads of the triceps brachii started at 40 s, 50 s, and 65 s during the prolonged contraction, respectively. The highest fatiguing rate was observed in the long head (slope = -2.863), followed by the medial head (slope = -2.412) and the lateral head (slope = -1.877) of the triceps brachii muscle. The results of the present study concurs with previous findings that the three heads of the triceps brachii muscle do not work as a single unit, and the fiber type/composition is different among the three heads.

No MeSH data available.


Related in: MedlinePlus