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Differences in Gluteal and Quadriceps Muscle Activation Among Adults With and Without Lumbar Hyperlordosis.

Abstract：

CONTEXT:Many factors have been reported contributing to altering the neuromuscular function of hip and knee muscles. The lumbar hyperlordosis, as a poor posture in some athletes, is thought to be associated with the alteration of the hip and knee muscles activity. OBJECTIVE:To examine the activation of selected hip and knee muscles in athletes with and without lumbar hyperlordosis during functional activities. DESIGN:Case-control study. SETTING:University laboratory. PARTICIPANTS:Twenty-six college male athletes (n = 13 with and n = 13 without lumbar hyperlordosis). INTERVENTIONS:Surface electromyography of gluteus maximus (GMAX), gluteus medius (GMED), vastus medialis oblique (VMO), and vastus lateralis (VL) were recorded during single-leg squat and single-leg jump landing (SLJL) tasks. MAIN OUTCOME MEASURE:Preactivity; reactivity; and onset muscle during SLJL and eccentric activity during single-leg squat (GMAX, GMED, VMO, and VL along with the ratio of VMO:VL) were assessed. RESULTS:Athletes with lumbar hyperlordosis had a higher level of activity in their GMAX (P = .003), VMO (P = .04), and VL (P = .01) muscles at the moment before foot contact during SLJL. These athletes also demonstrated a higher level of GMAX activity (P = .01) immediately after foot contact. Finally, athletes with lumbar hyperlordosis activated their GMAX sooner (P = .02) during the SLJL. Athletes with normal lumbar lordosis had more activity in their GMED muscle (P = .001) in the descending phase of the single-leg squat task and a higher VMO:VL (P = .01) at the moment after the foot contact during the SLJL. CONCLUSION:The altered activation of GMAX, GMED, VMO, VL, and VMO:VL can reveal the role of lumbar hyperlordosis in the knee and hip muscles' alteration in athletes. Further study is needed to identify whether these alterations in the hip and knee muscles contribute to injury in athletes.

journal_name

J Sport Rehabil

journal_title

Journal of sport rehabilitation

authors

Izadi Farhadi MH,Seidi F,Minoonejad H,Thomas AC

doi

10.1123/jsr.2019-0112

subject

Has Abstract

pub_date

2020-11-01 00:00:00

pages

1100-1105

issue

eissn

1056-6716

issn

1543-3072

pii

jsr.2019-0112

journal_volume

pub_type

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Differences in Gluteal and Quadriceps Muscle Activation Among Adults With and Without Lumbar Hyperlordosis.