A Comparison of Trunk Extensor Strength and Squat Lifting Ability

Roberson, Joelle Miranda; Witt, Philip L.; Gross, Michael T.

doi:10.2519/jospt.1997.25.2.137

Cited by 8 publications

(6 citation statements)

References 22 publications

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“…On average, the peak reaction moment about the L5/S1 joint was 259 N·m during MVA. This value is in agreement with data reported in our previous study (Plamondon et al., 1999) and by a large number of studies using participants with a similar age range and despite different conditions of measurement (McNeill, Warwick, Andersson, Schultz, 1980; Smidt, Amundsen, Dostal, 1980; Graves et al., 1990; Gravel, Gagnon, Plamondon, Desjardins, 1997; Roberson, Witt, Gross, 1997). A strong relationship was found between the body mass and the peak reaction moment during MVA.…”

Section: Discussionsupporting

confidence: 93%

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Estimated moments at L5/S1 level and muscular activation of back extensors for six prone back extension exercises in healthy individuals

Plamondon

Serresse

Boyd

et al. 2002

Scandinavian Med Sci Sports

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The purpose of this study was to identify the prone back extension (PBE) exercises that offer the most resistance to the back extensor muscles. Twenty males with no previous history of low back injury performed two repetitions of eight exercises. These consisted of two maximal isometric voluntary activations (MVA) and six different PBE exercises. The participants, while lying prone on a bench, were asked to raise either their trunk or legs to the horizontal position and hold for one second (static phase) before returning to the original position. The exercises differed according to the particular segments that were raised into extension. To assess the PBE exercises, a biomechanical model was used to estimate the level of load resistance (%MVA) relative to the maximum voluntary activation strength (MVA). In addition, electromyography (EMG) was included to measure the level of muscle activity (%MVE) relative to the maximum voluntary activation EMG (MVE) value reached during the MVA. A significant relationship of 0.86 was found between the mass of the subject and the peak reaction moment during the MVA. Peak level of load resistance averaged around 50% MVA with the exception of exercise no. 5 where the subject had to raise in extension his trunk, legs and arms (65% MVA). The erector spinae (ES) activity level reached a peak value of 61% MVE for exercise no. 5. In the exercises where only the trunk was lifted, the peak level of ES was below 47% MVE and the average activity during the static phase reached approximately 26% MVE. For healthy individuals PBE exercises can be considered low intensity exercises (< 50% MVA; except exercise no. 5) and can be used to improve the endurance of the back muscles.

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Section: Discussionsupporting

confidence: 93%

“…A strong relationship was found between the body mass and the peak reaction moment during MVA. The magnitude of this correlation is higher than the value of 0.69 reported by Roberson et al. (1997).…”

Section: Discussioncontrasting

confidence: 66%

Estimated moments at L5/S1 level and muscular activation of back extensors for six prone back extension exercises in healthy individuals

Plamondon

Serresse

Boyd

et al. 2002

Scandinavian Med Sci Sports

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“…The level of resistance for the exercise averaged about 48% MVC, which is comparable with the 40% MVC found in Plamondon et al (1999) with the arms parallel to the trunk. The initial M MVC of women (149 N m) was lower than that of men, as confirmed by others (McNeill et al, 1980 and Roberson et al, 1997), and consequently their level of resistance in the static phase was significantly higher (60% MVC).…”

Section: Discussionsupporting

confidence: 79%

“…, 1999; Plamondon et al . , 2002) and in a large number of studies using subjects with a similar age range (McNeill et al, 1980; Gravel et al, 1997; Roberson et al, 1997). The level of resistance for the exercise averaged about 48% MVC, which is comparable with the 40% MVC found in Plamondon et al (1999) with the arms parallel to the trunk.…”

Section: Discussionmentioning

confidence: 99%

Back muscle fatigue during intermittent prone back extension exercise

Plamondon

Trimble

Larivière

et al. 2004

Scandinavian Med Sci Sports

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Most of the subjects (34 out of 41) completed the 100 repetitions without excessive muscle fatigue according to the post-exercise MVC values. The intermittent PBE increased fatigue in the lumbar and hip extensor muscles in terms of: (1) a decrease in the MVC; (2) an increase in the level of muscle activation; and (3) a decline of the median frequency (MF). There was no gender difference in all EMG measurements. The level of muscle activation in the hip extensors (GM and HA) was associated with task failure (number of repetitions <100) for some subjects and the addition of a weight of 45 N had more impact on HA than ES. In conclusion, the PBE exercise as performed in the present study (including rest intervals), although not very strenuous for our healthy subjects, seems an adequate exercise to measure and train the aerobic capacity of the back muscles. However, to train specifically the back muscles, the exercise must be adjusted to avoid task failure due to possible hip extensor fatigue.

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“…Evaluations of strength and range of motion, as used by advocates of iso‐testing, are evaluations more of body function or body structure and provide little information about the functional effects of injury on occupational performance. Furthermore, there is evidence that iso‐testing has poor relevance to functional performance (Dempsey, Ayoub & Westfall, 1998; Loisel et al ., 1998; Nattrass, Nitschke, Disler, Chou & Ooi, 1999; Roberson , Witt & Gross, 1997).…”

Section: The International Classification Of Functioning Disability mentioning

confidence: 99%

A conceptual framework of functional capacity evaluation for occupational therapy in work rehabilitation

Gibson

Strong

2003

Aus Occup Therapy J

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Functional capacity evaluation (FCE) is commonly used in work rehabilitation to assess the capacity of the injured worker for return to work. Occupational therapists are major providers of FCE, especially in Australia. Despite a history of involvement in the functional assessment of clients for work, occupational therapy has few theoretical models for work assessment in general, and for FCE in particular. This may account for some of the confusion that exists about the conceptual basis of FCE in occupational therapy practice. This paper presents a framework for FCE that parallels occupational therapy's occupational performance model and the World Health Organisation's International Classification of Functioning, Disability and Health.The framework is used to clarify some of the confusions that exist in FCE research and practice, particularly the issue of measuring a client's function versus impairment. A redefinition of FCE for occupational therapy practice in the work assessment continuum is presented that supports occupational therapy practice and research in the area.

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A Comparison of Trunk Extensor Strength and Squat Lifting Ability

Cited by 8 publications

References 22 publications

Estimated moments at L5/S1 level and muscular activation of back extensors for six prone back extension exercises in healthy individuals

Estimated moments at L5/S1 level and muscular activation of back extensors for six prone back extension exercises in healthy individuals

Back muscle fatigue during intermittent prone back extension exercise

A conceptual framework of functional capacity evaluation for occupational therapy in work rehabilitation

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