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Comparison of Muscle Activity Using Unstable Devices During a Forward Lunge.
Journal of Sport Rehabilitation 2019 March 13
CONTEXT:: Unstable devices in various forms are used as therapeutic adjuncts for prevention or following an injury. A slip-over-shoe design with inflatable domes (STEPRIGHT® Stability Trainer) was developed to improve balance. It is unknown how this unstable device affects muscle activity during a closed-chain exercise such as the forward lunge.
OBJECTIVE:: To compare muscle activity across three surfaces (STEPRIGHT®, BOSU® Balance Trainer, and firm) during a forward lunge.
DESIGN:: Within-subject, repeated measures.
SETTING:: University Physical Therapy Research Laboratory.
PARTICIPANTS:: 20 healthy, recreationally active subjects: (23.4 + 1.47 yrs; 172.7+ 14.7 cm, 71.6+16.8 kg).
INTERVENTION:: Each subject performed one set of ten repetitions of forward lunge exercise in random order with STEPRIGHT®, BOSU®, and firm surface.
MAIN OUTCOME MEASURES:: Surface electromyography (SEMG) data, normalized to maximum voluntary isometric contractions (%MVIC), was used to assess muscle activity on rectus femoris (RF), vastus medalis oblique (VMO), biceps femoris (BF), lateral gastrocnemius (LG), fibularis longus (FL), and tibialis anterior (TA).
RESULTS:: The repeated measures ANOVA determined that there was a significant effect for surface type. During the descent of the lunge, the STEPRIGHT® elicited higher RF (33+ 27%MVIC) compared to BOSU® (22+ 14%MVIC) and VMO (44+ 15%MVIC) on STEPRIGHT® compared to firm (38+ 11%MVIC), (p<.05). During the ascent of the lunge, the RF (38+ 27%MVIC) using STEPRIGHT® was higher than BOSU® (24+ 16%MVIC) and STEPRIGHT® elicited higher VMO (65+ 20%MVIC) versus BOSU® (56+ 19%MVIC), (p<.01). The STEPRIGHT® for FL was higher (descent: 51+ 20%MVIC; ascent:52+22%MVIC) than BOSU® (descent: 36+15%MVIC; ascent:33+16%MVIC), or firm (descent: 33+12%MVIC; ascent 35+15%MVIC:), (p<.001).
CONCLUSIONS:: Clinicians may choose to use the STEPRIGHT® for strengthening VMO and FL muscles as these were over 41% MVIC or any of the three surfaces for endurance training (< 25%MVIC) for BF muscle. This information may be helpful in exercise dosage for forward lunges when using STEPRIGHT®, BOSU®, or a firm surface.
OBJECTIVE:: To compare muscle activity across three surfaces (STEPRIGHT®, BOSU® Balance Trainer, and firm) during a forward lunge.
DESIGN:: Within-subject, repeated measures.
SETTING:: University Physical Therapy Research Laboratory.
PARTICIPANTS:: 20 healthy, recreationally active subjects: (23.4 + 1.47 yrs; 172.7+ 14.7 cm, 71.6+16.8 kg).
INTERVENTION:: Each subject performed one set of ten repetitions of forward lunge exercise in random order with STEPRIGHT®, BOSU®, and firm surface.
MAIN OUTCOME MEASURES:: Surface electromyography (SEMG) data, normalized to maximum voluntary isometric contractions (%MVIC), was used to assess muscle activity on rectus femoris (RF), vastus medalis oblique (VMO), biceps femoris (BF), lateral gastrocnemius (LG), fibularis longus (FL), and tibialis anterior (TA).
RESULTS:: The repeated measures ANOVA determined that there was a significant effect for surface type. During the descent of the lunge, the STEPRIGHT® elicited higher RF (33+ 27%MVIC) compared to BOSU® (22+ 14%MVIC) and VMO (44+ 15%MVIC) on STEPRIGHT® compared to firm (38+ 11%MVIC), (p<.05). During the ascent of the lunge, the RF (38+ 27%MVIC) using STEPRIGHT® was higher than BOSU® (24+ 16%MVIC) and STEPRIGHT® elicited higher VMO (65+ 20%MVIC) versus BOSU® (56+ 19%MVIC), (p<.01). The STEPRIGHT® for FL was higher (descent: 51+ 20%MVIC; ascent:52+22%MVIC) than BOSU® (descent: 36+15%MVIC; ascent:33+16%MVIC), or firm (descent: 33+12%MVIC; ascent 35+15%MVIC:), (p<.001).
CONCLUSIONS:: Clinicians may choose to use the STEPRIGHT® for strengthening VMO and FL muscles as these were over 41% MVIC or any of the three surfaces for endurance training (< 25%MVIC) for BF muscle. This information may be helpful in exercise dosage for forward lunges when using STEPRIGHT®, BOSU®, or a firm surface.
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