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Effects of fatigue on trunk stability in elite gymnasts.

van Dieën JH, Luger T, van der Eb J - Eur. J. Appl. Physiol. (2011)

Bottom Line: Nine female gymnasts participated in the study.To fatigue trunk muscles, four series of five dump handstands on the uneven bar were performed.In addition, the maximum displacement after the sudden release was increased (p = 0.009), while the rate of recovery after the perturbation was decreased (p = 0.05).

View Article: PubMed Central - PubMed

Affiliation: Faculty of Human Movement Sciences, Research Institute MOVE, VU University Amsterdam, Van der Boechorststraat 9, 1081 BT Amsterdam, The Netherlands. j.vandieen@fbw.vu.nl

ABSTRACT
The aim of the present study was to test the hypothesis that fatigue due to exercises performed in training leads to a decrement of trunk stability in elite, female gymnasts. Nine female gymnasts participated in the study. To fatigue trunk muscles, four series of five dump handstands on the uneven bar were performed. Before and after the fatigue protocol, participants performed three trials of a balancing task while sitting on a seat fixed over a hemisphere to create an unstable surface. A force plate tracked the location of the center of pressure (CoP). In addition, nine trials were performed in which the seat was backward inclined over a set angle and suddenly released after which the subject had to regain balance. Sway amplitude and frequency in unperturbed sitting were determined from the CoP time series and averaged over trials. The maximum displacement and rate of recovery of the CoP location after the sudden release were determined and averaged over trials. After the fatigue protocol, sway amplitude in the fore-aft direction was significantly increased (p = 0.03), while sway frequency was decreased (p = 0.005). In addition, the maximum displacement after the sudden release was increased (p = 0.009), while the rate of recovery after the perturbation was decreased (p = 0.05). Fatigue induced by series of exercises representing a realistic training load caused a measurable decrement in dynamic stability of the trunk in elite gymnasts.

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Typical examples of: the CoP time series in the unperturbed trials with anterior–posterior displacement in black and left–right displacement in gray (a), the spatial distribution of the CoP position in the same trial (b), the RMSx (black) and RMSy (gray) values for all trials of the same subject (c), the MPFx (black) and MPFy (gray) values for all trials of the same subject (d). The fatiguing exercise was performed between trials three and four
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Fig2: Typical examples of: the CoP time series in the unperturbed trials with anterior–posterior displacement in black and left–right displacement in gray (a), the spatial distribution of the CoP position in the same trial (b), the RMSx (black) and RMSy (gray) values for all trials of the same subject (c), the MPFx (black) and MPFy (gray) values for all trials of the same subject (d). The fatiguing exercise was performed between trials three and four

Mentions: For the unperturbed trials (see Fig. 2 for an example), the mean CoP position determined over the first 2 s was first subtracted from the time series. Next, the maximum CoP position in the y direction was determined, which reflects the maximum backward CoP displacement after the sudden release (MAXy). Subsequently, an exponential decay function was fitted to the CoP time series in the y direction from the instant of MAXy and the subsequent 7 s (Fig. 3; Bruijn et al. 2010):Fig. 2


Effects of fatigue on trunk stability in elite gymnasts.

van Dieën JH, Luger T, van der Eb J - Eur. J. Appl. Physiol. (2011)

Typical examples of: the CoP time series in the unperturbed trials with anterior–posterior displacement in black and left–right displacement in gray (a), the spatial distribution of the CoP position in the same trial (b), the RMSx (black) and RMSy (gray) values for all trials of the same subject (c), the MPFx (black) and MPFy (gray) values for all trials of the same subject (d). The fatiguing exercise was performed between trials three and four
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3299971&req=5

Fig2: Typical examples of: the CoP time series in the unperturbed trials with anterior–posterior displacement in black and left–right displacement in gray (a), the spatial distribution of the CoP position in the same trial (b), the RMSx (black) and RMSy (gray) values for all trials of the same subject (c), the MPFx (black) and MPFy (gray) values for all trials of the same subject (d). The fatiguing exercise was performed between trials three and four
Mentions: For the unperturbed trials (see Fig. 2 for an example), the mean CoP position determined over the first 2 s was first subtracted from the time series. Next, the maximum CoP position in the y direction was determined, which reflects the maximum backward CoP displacement after the sudden release (MAXy). Subsequently, an exponential decay function was fitted to the CoP time series in the y direction from the instant of MAXy and the subsequent 7 s (Fig. 3; Bruijn et al. 2010):Fig. 2

Bottom Line: Nine female gymnasts participated in the study.To fatigue trunk muscles, four series of five dump handstands on the uneven bar were performed.In addition, the maximum displacement after the sudden release was increased (p = 0.009), while the rate of recovery after the perturbation was decreased (p = 0.05).

View Article: PubMed Central - PubMed

Affiliation: Faculty of Human Movement Sciences, Research Institute MOVE, VU University Amsterdam, Van der Boechorststraat 9, 1081 BT Amsterdam, The Netherlands. j.vandieen@fbw.vu.nl

ABSTRACT
The aim of the present study was to test the hypothesis that fatigue due to exercises performed in training leads to a decrement of trunk stability in elite, female gymnasts. Nine female gymnasts participated in the study. To fatigue trunk muscles, four series of five dump handstands on the uneven bar were performed. Before and after the fatigue protocol, participants performed three trials of a balancing task while sitting on a seat fixed over a hemisphere to create an unstable surface. A force plate tracked the location of the center of pressure (CoP). In addition, nine trials were performed in which the seat was backward inclined over a set angle and suddenly released after which the subject had to regain balance. Sway amplitude and frequency in unperturbed sitting were determined from the CoP time series and averaged over trials. The maximum displacement and rate of recovery of the CoP location after the sudden release were determined and averaged over trials. After the fatigue protocol, sway amplitude in the fore-aft direction was significantly increased (p = 0.03), while sway frequency was decreased (p = 0.005). In addition, the maximum displacement after the sudden release was increased (p = 0.009), while the rate of recovery after the perturbation was decreased (p = 0.05). Fatigue induced by series of exercises representing a realistic training load caused a measurable decrement in dynamic stability of the trunk in elite gymnasts.

Show MeSH
Related in: MedlinePlus