EFFECTS OF ADDITIONAL PERTURBATION ON NEUROMUSCULAR TRUNK ACTIVATION PATTERN DURING CORE-SPECIFIC SENSORIMOTOR EXERCISE

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Abstract

Background

Sensorimotor exercises (SE) are evident to enhance neuromuscular activity of the trunk muscles (TM). However, it is unclear if an additional unexpected perturbation leads to higher muscular activity and therefore enhances training efficacy.

Objective

To analyse effects of additional unexpected perturbations on trunk neuromuscular activation pattern during SE.

Design

Cross-sectional design.

Setting

University Outpatient Clinic, Sports Medicine Centre.

Participants

Ten healthy, normal active participants (5 m/5 f; 29±2 yrs; 177±7 cm, 74±12 kg) were included.

Assessment of Risk Factors

All participants were prepared with a bilateral 12-lead trunk EMG (Mm. rectus abdominis (RA), external obliquus (EO), internal obliquus (IO), latissimus dorsi (LD), thoracic (UES) and lumbar erector spinae (LES)). Warm-up on an isokinetic dynamometer (extension/flexion; 30 rep; 60°sec) was followed by maximum voluntary isometric contraction measurements (MVC, 5 sec). Next, a (right-armed) side plank on stable surface (SP; 30 sec) and 2 different instable conditions were randomly assigned (SP plus pad under the elbow (SPP), SPP plus perturbation (SPP+P)).

Main Outcome Measurements

Root mean square (RMS) normalized to MVC (%MVC) was calculated during the whole exercise. Muscles were grouped to ventral right/left (VR;VL=mean of RA, IO, EO), and dorsal right/left (DR;DL=mean of LD, UES, LES). Differences between conditions were calculated for muscle groups, Ventral:Dorsal (V:D) and Side-Right/Side-Left ratio (SR;SL) (repeated-measures ANOVA; α=0.05).

Results

SPP+P showed highest EMG-RMS (e.g,VR: 81±9%; DR: 55±12%) for all muscle groups except DL with significant differences (p<0.05) between conditions SP and SPP+P in VR, VL and DR muscle groups. No differences were found between SPP (e.g.,VR: 71±11%) and SPP+P (e.g.,VR: 81±9%)(p>0.05). Statistically significant higher V:D ratios was found in SPP+P compared to SP (p<0.05). SR:SL ratio did not show any differences (p>0.05).

Conclusions

The use of additional perturbations during core stability training is superior to enhance trunk neuromuscular activity and should be implemented into sensorimotor exercises addressing the trunk.

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