Changes in the medial–lateral hamstring activation ratio with foot rotation during lower limb exercise

Lynn, Scott K.; Costigan, Patrick A.

doi:10.1016/j.jelekin.2008.01.007

Cited by 39 publications

(25 citation statements)

References 22 publications

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“…These data10–12 44 46 are consistent with the possibility that conventional rehabilitation strategies may not adequately target the commonly injured BF LongHead . The ratio of lateral to medial hamstring (BF/MH) nEMG varies with foot rotation47 and differs between exercises 25. In our study, the eccentric phase of the 45° hip-extension exercise exhibited the greatest BF/MH nEMG ratio (1.5±0.1) while the Nordic (0.8±0.1) and bent-knee bridge exercises (0.8±0.1) displayed the lowest ratios.…”

Section: Discussionmentioning

confidence: 58%

Impact of exercise selection on hamstring muscle activation

et al. 2016

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We highlight the heterogeneity of hamstring activation patterns in different tasks. Hip-extension exercise selectively activates the long hamstrings, and the Nordic exercise preferentially recruits the semitendinosus. These findings have implications for strategies to prevent hamstring injury as well as potentially for clinicians targeting specific hamstring components for treatment (mechanotherapy).

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Section: Discussionmentioning

confidence: 58%

Impact of exercise selection on hamstring muscle activation

et al. 2016

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“…Further, the BF long head appears to be significantly more active in hip extension-than knee flexion-oriented movements [5], and the SLB exercise is predominantly a hip-based movement. It is also important to consider that foot position was not strictly controlled in the current investigation and it is possible that rotation of the tibia may result in preferential activation of either the lateral or medial hamstrings [14]. It should be acknowledged that there are some limitations associated with the current study.…”

Section: Discussionmentioning

confidence: 95%

A functional MRI Exploration of Hamstring Activation During the Supine Bridge Exercise

et al. 2017

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The single leg supine bridge (SLB) is a commonly employed strengthening exercise and is used as a clinical test for hamstring function in sports, however, little is known about the patterns of muscle activation in this task. To explore these activation patterns, nine healthy, recreationally active males underwent functional magnetic resonance imaging (fMRI) of their thighs at rest and immediately after 5 sets of 10 repetitions of the SLB exercise. Exercise-induced increases in the transverse (T2) relaxation time of the biceps femoris long and short heads, semitendinosus and semimembranosus, were determined via signal intensity changes in pre- and post-exercise images and used as an index of muscle activation. The Bonferroni adjusted alpha was set at p<0.008. The semitendinosus exhibited a greater T2 increase than the biceps femoris short head (p<0.001, d=2.0) and semimembranosus (p=0.001, d=1.2), but not biceps femoris long head (p=0.029, d=0.9). Furthermore, the percentage change in T2 for biceps femoris long head was greater than its short head (p=0.003, d=1.4). During the SLB exercise, the semitendinosus is most selectively targeted and the biceps femoris long head is preferentially activated over its short head. These findings may have implications for the use of the SLB in hamstring injury prevention and rehabilitation programs.

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“…Increased ipsilateral trunk lean related to a reduced knee adduction moment in both healthy individuals and patients with knee osteoarthritis, supposedly by reducing the distance between the center of rotation of the knee and the vertical projection of the ground reaction force [45,46]. Altered foot progression angle (or 'toe-out' gait) influenced the knee adduction moment in subjects with knee osteoarthritis [47,48]. The mechanism of effect remains unclear; whereas some authors suggest toe-out gait shifts the center of pressure under the foot laterally to reduce the moment arm involved in the adduction moment [47], others have shown alterations in hamstrings muscle activation patterns [49].…”

Section: Lower Extremity Kinetic Chainmentioning

confidence: 99%

Abnormal and cumulative loading in knee osteoarthritis

Maly¹

2008

Current Opinion in Rheumatology

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Knee osteoarthritis pathomechanics involves an interaction between abnormal and excessive and/or repetitive loading. Mechanics of lower extremity joints and muscle activation patterns influence the knee loading environment. Future work could integrate measures of abnormal loading with assessments of the total exposure to loading during physical activity to better link biomechanics with clinical outcomes in knee osteoarthritis.

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Changes in the medial–lateral hamstring activation ratio with foot rotation during lower limb exercise

Cited by 39 publications

References 22 publications

Impact of exercise selection on hamstring muscle activation

Impact of exercise selection on hamstring muscle activation

A functional MRI Exploration of Hamstring Activation During the Supine Bridge Exercise

Abnormal and cumulative loading in knee osteoarthritis

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