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J Sport Rehabil. 2011 Nov;20(4):428-41.

Hip- and thigh-muscle activation during the star excursion balance test.

Author information

1
Select Physical Therapy, Clarksville, TN, USA.

Abstract

CONTEXT:

The Star Excursion Balance Test (SEBT) is often used to train and assess dynamic balance and neuromuscular control. Few studies have examined hip- and thigh-muscle activation during the SEBT.

OBJECTIVE:

To quantify hip- and thigh-muscle activity during the SEBT.

DESIGN:

Repeated measures.

SETTING:

Laboratory.

PARTICIPANTS:

22 healthy individuals, 11 men and 11 women.

METHODS:

EMG measurements were taken as participants completed 3 trials of the anterior (A), medial (M), and posteromedial (PM) reach directions of the SEBT.

MAIN OUTCOME MEASURES:

Mean EMG data (% maximal voluntary isometric contraction) from the gluteus medius (Gmed), gluteus maximus (Gmax), and vastus medialis (VM) were measured during the eccentric phase of each SEBT reach direction. Test-retest reliability of EMG data across the 3 trials in each direction was calculated. EMG data from each muscle were compared across the 3 reach directions.

RESULTS:

Test-retest reliability ranged from ICC3,1 values of .91 to .99. A 2-way repeated-measure ANOVA revealed a significant interaction between muscle activation and reach direction. One-way ANOVAs showed no difference in GMed activity between the A and M directions. GMed activity in the A and M directions was greater than in the PM direction. There was no difference in GMax and VM activity across the 3 directions.

CONCLUSION:

GMed was recruited most effectively when reaching was performed in the A and M directions. The A, M, and PM directions elicited similar patterns of muscle recruitment for the GMax and VM. During all 3 SEBT directions, VM activation exceeded the 40-60% threshold suggested for strengthening effects. GMed activity also exceeded the threshold in the M direction. GMax activation, however, was below the 40% threshold for all 3 reach directions, suggesting that performing dynamic lower extremity reaching in the A, M, and PM directions may not elicit strengthening effects for the GMax.

PMID:
22012497
[Indexed for MEDLINE]

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