Exploring the Interaction between Physical, Psychosocial, and Neck Pain Symptoms in Construction Workers.

Objective: Construction workers are significantly vulnerable to musculoskeletal disorders, yet the number of studies conducted in developing nations-where these workers significantly contribute to the economy-remains insufficient. This study aims at exploring the interaction between physical and psychosocial exposure to the onset of neck pain or symptoms amongst construction workers in a developing country.

Methods: Using a cross-sectional study design, a total of 235 respondents from various construction projects participated in this study.

The Role of Safety Silence Motives to Safety Communication and Safety Participation in Different Sectors of Small and Medium Enterprises: Investigation Results on Two Kinds of Industries in Indonesia.

Background: A number of accidents have occurred in small and medium enterprises (SMEs). Efforts in reducing accidents have been undertaken through the implementation of safety behaviors. Unfortunately, few studies have examined motives behind unsafe behaviors, such as safety silence motives.

Muscle fatigue during intermittent isokinetic shoulder abduction: age effects and utility of electromyographic measures.

Most existing evidence regarding the effects of age on muscular fatigue has focused on prolonged isometric contractions, repeated maximum dynamic contractions and individuals beyond traditional retirement age (>65 years). In the present study, age-related differences in muscle fatigue during submaximal dynamic efforts were examined. There were 24 younger (18-25 years) and 24 older (55-65 years) participants, all of whom were healthy and active, with equal numbers of each gender within each age group.

The influence of age on isometric endurance and fatigue is muscle dependent: a study of shoulder abduction and torso extension.

The present study examined differences in isometric muscle capacity between older (55-65 years) and younger (18 - 25 years) individuals. A total of 24 younger and 24 older participants (gender balanced within each group) performed sustained shoulder abductions and torso extensions to exhaustion at 30%, 50% and 70% of individual maximal voluntary contraction (MVC). Along with endurance time, manifestations of localized fatigue were determined based on changes in surface electromyographic signals obtained from the shoulder (middle deltoid) and the torso (multifidus and longissimus thoracis) muscles.

Utility of traditional and alternative EMG-based measures of fatigue during low-moderate level isometric efforts.

Traditional electromyographic (EMG) measures (e.g., amplitude, mean and median frequencies of the power spectra) have demonstrated inconsistent abilities in monitoring localized muscle fatigue at relatively low effort levels.