Hand grip increases shoulder muscle activity: An EMG analysis with static handcontractions in 9 subjects

Sporrong, Hiikan; Palmerud, Gunnar; Herberts, Peter

doi:10.3109/17453679608996674

Cited by 82 publications

(63 citation statements)

References 20 publications

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“…For this reason, DM is not usually considered relevant in exercise limitation. Interestingly, this muscle is involved in activities such as the isometric contraction of the hand [26], which can be easily tested in a clinical laboratory (handgrip test).…”

Section: Discussionmentioning

confidence: 99%

Metabolic characteristics of the deltoid muscle in patients with chronic obstructive pulmonary disease

et al. 2001

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The purpose of this study was to analyse key enzyme activities of the deltoid muscle (DM) in chronic obstructive pulmonary disease (COPD) patients.The activities of one oxidative enzyme (citrate synthase (CS)), two glycolytic enzymes (lacatate dehydrogenase (LD); and phosphofructokinase (PFK)) and one enzyme related to the use of energy stores (creatine kinase (CK)) were determined in the DM of 10 patients with COPD and nine controls. Exercise capacity (cycloergometry) and the handgrip strength were also evaluated.Although exercise capacity was markedly reduced in COPD (57¡20% predicted), their handgrip strength was relatively preserved (77¡19% pred). One of the main symptoms in patients with chronic obstructive pulmonary disease (COPD) is limitation to exercise [1]. This limitation was classically attributed to ventilatory factors, and the role of peripheral skeletal muscle dysfunction has only been recognized in recent years [1][2][3]. The potential causes of this functional impairment would include loss in muscle mass, fibre atrophy, and decreases in the percentage of oxidative fibres and enzyme activities [4,5]. However, it is unclear whether muscle weakness is a generalized problem, or if it only or predominately affects some muscle groups. In addition, the causes of skeletal muscle weakness, and the specific role for each, still remain controversial. However, it is worth noting that most of the previous studies were performed in muscles from the lower limbs, where deconditioning due to reduction in activity may be particularly relevant but could coexist with other factors. The study of muscles from other locations, such as the deltoid muscle (DM), could contribute not only to elucidate whether skeletal muscle changes in COPD are homogeneous, but also to clarify whether systemic or local aetiological factors play the predominant role in inducing such changes. The objectives of the study were, firstly, to evaluate the metabolic capacity of the DM in COPD patients, and secondly, to investigate the potential relationships between lung function and the activity of different key enzymes in DM. Methods PopulationTen patients with severe-to-mild COPD were included (table 1). The COPD diagnosis was based on smoking history and forced spirometry showing nonreversible airways obstruction. All patients were clinically stable, with absence of exacerbations during the 2 months prior to the study. Recruitment was carried out consecutively on COPD patients who consulted the authors9 department and subsequently agreed to participate in the study. In order to avoid bias due to hormonal factors, only males were included. At the same time, individuals with malnutrition (body mass index (BMI) v20 kg?m -2 ), alcoholism (w80 g?day -1 ), bronchial asthma, associated chronic respiratory failure, neuromuscular or metabolic diseases, undergoing chronic treatment with systemic steroids, systemic b-agonists, Ca zz antagonists or diuretics, and those undergoing rehabilitation were excluded. Nine subjects of similar age and an...

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Section: Discussionmentioning

confidence: 99%

Metabolic characteristics of the deltoid muscle in patients with chronic obstructive pulmonary disease

et al. 2001

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“…To assess the effects of physical exposures imposed on the upper extremities in work activities, we focused first on determining the optimal cut points for each of the exposure variables based on the previous, although limited, epidemiological literature (29-36), biomechanical and physiological studies (37)(38)(39)(40)(41), and the distributions of the data in our study population.…”

Section: Physical Load Assessmentmentioning

confidence: 99%

Gender adjustment or stratification in discerning upper extremity musculoskeletal disorder risk?

Silverstein¹,

Fan²,

Smith³

et al. 2009

Scand J Work Environ Health

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“…To date, there is no evidence of propriospinal input to muscles of the rotator cuff complex. Since gripping and precise use of the hand in humans are accompanied by changes in the excitability of the rotator cuff muscles (Laursen et al 1998;Sporrong and Styf 1999;Sporrong et al 1995Sporrong et al , 1996, sensory feedback from contracting hand muscles may project to the rotator cuff via propriospinal premotoneurons. The aim of this experiment was to assess the role of the putative propriospinal system in controlling infraspinatus (INF) and to assess whether task differences in MEP ratios suggest task-dependent modulation of the propriospinal premotoneurons.…”

Section: Introductionmentioning

confidence: 99%

Task-Dependent Modulation of Propriospinal Inputs to Human Shoulder

Roberts¹,

Stinear²,

Lewis³

et al. 2008

Journal of Neurophysiology

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Hand grip increases shoulder muscle activity: An EMG analysis with static handcontractions in 9 subjects

Cited by 82 publications

References 20 publications

Metabolic characteristics of the deltoid muscle in patients with chronic obstructive pulmonary disease

Metabolic characteristics of the deltoid muscle in patients with chronic obstructive pulmonary disease

Gender adjustment or stratification in discerning upper extremity musculoskeletal disorder risk?

Task-Dependent Modulation of Propriospinal Inputs to Human Shoulder

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