Plyometric exercises: subsequent changes of weight-bearing symmetry, muscle strength and walking performance in children with unilateral cerebral palsy.

OBJECTIVE

To evaluate the subsequent effects of plyometric training on weight-bearing symmetry, muscle strength, and gait performance in children with unilateral cerebral palsy.

METHODS

Thirty-nine children with spastic hemiplegia (age 8-12 years) were randomly divided into either the PLYO group (=19, received a 30-minute plyometric exercise program plus the traditional physical rehabilitation, twice/week for eight consecutive weeks) or Non-PLYO group (=20, received the traditional physical rehabilitation only). The weight-bearing symmetry index (WB-SI), maximum isometric muscle strength (MIMS) of quadriceps and hamstring muscles, and spatial-temporal gait parameters were assessed pre and post-intervention.

RESULTS

From pre- to post-intervention, changes of WB-SI among PLYO and Non-PLYO groups did not differ significantly (=.81; hindfoot and =.23; forefoot). MIMS of quadriceps and hamstring muscles at 90° knee flexion (=.008 and .013 respectively) increased significantly in PLYO compared to Non-PLYO group. Walking speed (=.033), stride length (=.002), and step time (<.001) improved markedly in PLYO group more than in Non-PLYO group. The proportion of single leg support (=.14) among PLYO and Non-PLYO groups did not differ significantly.

CONCLUSION

Addition of plyometric exercises to the physical rehabilitation programs of children with unilateral CP could achieve greater improvement in muscles strength and walking performance, but not in WB-SI.