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Task complexity and maximal isometric strength gains through motor learning.

McGuire J, Green LA, Gabriel DA - Physiol Rep (2014)

Bottom Line: Both groups exhibited comparable increases in strength (20.2%, P < 0.01) and reductions in mean torque variability (26.2%, P < 0.01), which were retained and transferred.There was a decrease in the coactivation ratio (antagonist/agonist muscle activity) for both groups, which was retained and transferred (35.2%, P < 0.01).The control group underwent a decrease in variability of the torque- and sEMG-time curves from the first day of training to retention, but participants returned to baseline levels during the transfer condition (P < 0.01).

View Article: PubMed Central - PubMed

Affiliation: Electromyographic Kinesiology Laboratory, Faculty of Applied Health Sciences, Brock University, St. Catharines, Ontario, Canada.

No MeSH data available.


Related in: MedlinePlus

Representative traces to show the peak‐to‐peak (P‐P) amplitudes of the M‐ and V‐waves elicited during a maximal voluntary contraction.
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fig02: Representative traces to show the peak‐to‐peak (P‐P) amplitudes of the M‐ and V‐waves elicited during a maximal voluntary contraction.

Mentions: All data reduction was performed using MATLAB software (The Mathworks, Inc.). Figure 1 illustrates raw torque and sEMG traces for both the control (flexion‐only) and experimental (extension‐to‐flexion) conditions. The criterion measures were obtained from a 1‐sec window that terminated immediately before the V‐wave in the middle of each 5‐sec‐wrist flexion contraction. Mean maximal torque, and root‐mean‐square (RMS) sEMG amplitude for the FCR and ECR were calculated from this window. The sEMG measures were used to calculate a ratio for muscle coactivation: ECR antagonist RMS amplitude was divided by FCR agonist RMS amplitude (Kilmer et al. 1982; De Boer et al. 2007). Figure 2 shows the V‐wave P‐P amplitude which was divided by the P‐P amplitude of the maximum M‐wave to calculate V/Mmax ratio (Aagaard et al. 2002; Del Balso and Cafarelli 2007; Ekblom 2010).


Task complexity and maximal isometric strength gains through motor learning.

McGuire J, Green LA, Gabriel DA - Physiol Rep (2014)

Representative traces to show the peak‐to‐peak (P‐P) amplitudes of the M‐ and V‐waves elicited during a maximal voluntary contraction.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4255822&req=5

fig02: Representative traces to show the peak‐to‐peak (P‐P) amplitudes of the M‐ and V‐waves elicited during a maximal voluntary contraction.
Mentions: All data reduction was performed using MATLAB software (The Mathworks, Inc.). Figure 1 illustrates raw torque and sEMG traces for both the control (flexion‐only) and experimental (extension‐to‐flexion) conditions. The criterion measures were obtained from a 1‐sec window that terminated immediately before the V‐wave in the middle of each 5‐sec‐wrist flexion contraction. Mean maximal torque, and root‐mean‐square (RMS) sEMG amplitude for the FCR and ECR were calculated from this window. The sEMG measures were used to calculate a ratio for muscle coactivation: ECR antagonist RMS amplitude was divided by FCR agonist RMS amplitude (Kilmer et al. 1982; De Boer et al. 2007). Figure 2 shows the V‐wave P‐P amplitude which was divided by the P‐P amplitude of the maximum M‐wave to calculate V/Mmax ratio (Aagaard et al. 2002; Del Balso and Cafarelli 2007; Ekblom 2010).

Bottom Line: Both groups exhibited comparable increases in strength (20.2%, P < 0.01) and reductions in mean torque variability (26.2%, P < 0.01), which were retained and transferred.There was a decrease in the coactivation ratio (antagonist/agonist muscle activity) for both groups, which was retained and transferred (35.2%, P < 0.01).The control group underwent a decrease in variability of the torque- and sEMG-time curves from the first day of training to retention, but participants returned to baseline levels during the transfer condition (P < 0.01).

View Article: PubMed Central - PubMed

Affiliation: Electromyographic Kinesiology Laboratory, Faculty of Applied Health Sciences, Brock University, St. Catharines, Ontario, Canada.

No MeSH data available.


Related in: MedlinePlus