Grip strength, level of endurance, and manual task performance.

Examined the feasibility of applying the static strength and endurance relationships suggested in 1960 by W. Rohmert to a simple manual task. Results indicate that there was a relationship between grip strength expenditure and impairments in task performance similar in respect to the static strength and endurance relationships suggested. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Natural history of low back pain. A longitudinal study in nurses

STUDY DESIGN: Longitudinal study. OBJECTIVES: To assess the natural history of low back pain. SUMMARY OF BACKGROUND DATA: Most episodes of low back pain resolve or improve within a few weeks, but chronic or recurrent symptoms are common. Previous studies of natural history have usually relied on people's long-term recall of symptoms, or they have been limited to patients seeking clinical care. METHODS: Nurses (1,165 women) completed a baseline questionnaire and up to eight follow-up questionnaires 3 months apart. Each questionnaire asked whether they had experienced low back pain in the past month. One-month prevalences of pain at specified follow-ups were calculated according to histories of pain reported on earlier questionnaires. RESULTS: The 1-month prevalence of low back pain at individual follow-ups ranged from 16% to 19%. Of 906 women who completed the baseline questionnaire and at least three follow-up questionnaires, 38 (4.2%) reported pain every time they returned a questionnaire, and 190 (21.0%) reported pain on at least three occasions. The presence or absence of low back pain at baseline was highly predictive of future pain throughout follow-up. The longer that back pain was consistently reported, the more likely it was to be present at the next follow-up. Later risk was lowest in women who reported no back pain at baseline or either of the first two follow-ups. Back pain carried a worse prognosis if it was disabling or associated with sciatica. CONCLUSIONS: Our results confirm the importance of back pain duration and the occurrence of associated disability and sciatica as predictors of future symptoms, and allow more reliable quantification of the natural history of back pain in women of working age. In the absence of other information, the differentials in risk associated with a person's history of back pain appear to remain constant for a period of at least 2 years.     

Effects of electronic performance monitoring on personal control, task satisfaction, and task performance.

A laboratory study was conducted to assess effects of electronic performance monitoring on individuals working on computers in an officelike environment. Participants (N ?=?108) worked on a computerized data correction task under 6 experimental conditions that varied the amount of control over performance monitoring and knowledge concerning specific monitoring events. Results confirmed and extended a model proposed by D. B. Greenberger and S. Strasser (1986) to relate personal control, satisfaction, and performance. Participants with the ability to delay or prevent electronic performance monitoring indicated higher feelings of personal control and demonstrated superior task performance. Participants with exact knowledge of the occurrence of monitoring expressed lower feelings of personal control than those from whom specific knowledge of monitoring was hidden. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effect of self-efficacy, goals, and task strategies on task performance.

Manipulated self-efficacy and task strategies in the training of 209 undergraduates under high strategy, low strategy, and control conditions. Ss underwent 5 trials and were administered a self-efficacy scale after each trial. Results show that ability, past performance, and self-efficacy were the major predictors of goal choice. Ability, self-efficacy, goals, and task strategies were related to task performance. Self-efficacy was more strongly related to past performance than to future performance but remained a significant predictor of future performance even when past performance was controlled. Self-efficacy ratings for moderate to difficult levels of performance were the best predictors of future performance; a reanalysis of 2 previous goal-setting studies by the first author confirms this finding. (19 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effects of load stressors, cognitive complexity and Type A coronary prone behavior on visual-motor task performance.

In 2 experiments, 25 and 42 adult working males participated in a visual-motor task modeled on a video game. The game was designed to measure strategy, risk taking, errors committed, and overall task performance. Predictions of complexity theory for task performance were supported. In Exp II, Ss were divided into 4 subgroups on the basis of Type A (coronary prone) or Type B (noncoronary prone) behavior and on the basis of uni- vs multidimensional responding, as measured by an interview using the stems of the Sentence Completion Test. Type A behavior did not contribute to differences in visual-motor performance. More multidimensional Ss exceeded their unidimensional counterparts, especially in the application of strategy. The extension of complexity theory approaches to simpler tasks is discussed. It is noted that the frequently voiced assumptions of Type A individuals—that their behavior style tends to lead to higher performance levels—is not supported. (27 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Causal attributions, expectations, and task performance.

College students' performance on each of 2 chemistry tests (n?=?253 on the 1st test and 233 on the 2nd test) was classified as a success (or failure) if it met (or failed to meet) a minimum criterion of success that each S set prior to taking each test. Using a paired-comparison technique, Ss attributed their performance on each test to ability, effort, luck, and task difficulty. Among Ss who succeeded on the tests, expected and actual future performance were positively related to attributions to high ability and negatively related to attributions to good luck. Among Ss who experienced failure, expected performance was positively related to attributions to low effort and negatively related to attributions to low ability. Results of these analyses are related to D. T. Hall's (1976) model of psychological success. In addition, although expectations were strongly related to subsequent performance, the relationship was substantially weakened when prior performance and ability attributions were held constant. The implications of this finding for understanding expectancy perceptions are discussed. (16 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effects of temperature, clothing, and task complexity on task performance and satisfaction.

Examined the effects of room temperature, clothing, and task complexity on task performance and satisfaction. 120 18–22 yr old male college students worked on either a mathematical problem-solving task or a collating task. Room temperature was maintained at either 65 or 78Φ during the task session. Ss were requested to wear either a suit (or sport coat), long sleeve shirt, and tie; or a short-sleeve shirt with no tie. Ss were administered the Minnesota Satisfaction Questionnaire. Results show that Ss wearing appropriate clothing for the temperature conditions showed higher levels of performance and satisfaction with the working condition than did those wearing inappropriate clothing, regardless of task complexity. Similar results were found for intrinsic task satisfaction only for the simpler task. (12 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effects of aptitudes, strategy training, and task facets on spatial task performance.

A pilot study, with 8 high school students, demonstrated that 3 item characteristics accounted for most of the variation in item difficulty in a paper-folding task: number of folds, number of obscured folds, and number of asymmetric folds. Retrospective reports suggested that Ss employed 2 strategies when attempting to solve these items: a visualization strategy and an analytic strategy. In the main experiment, these 2 strategies were demonstrated via motion picture models; 24 Ss received visualization training, and 24 received analytic training. Training effects of the demonstration films were compared with a performance feedback condition given to 8 Ss. All Ss performed 74 paper-folding items and 60 surface development transfer items following treatment. Error and latency data suggested that the treatments affected strategy selection and efficiency on both tasks. Treatment effects depended on item characteristics and response mode as well as on Ss' fluid-analytic/visualization and verbal abilities, as assessed by the Concept Mastery Test, WAIS Vocabulary test, and Raven Progressive Matrices. Sex differences were also noted, with verbal ability being important in the performance of females but not males. Implications for a process theory of human abilities are discussed. (33 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Anthropometric variables, self-efficacy beliefs, and pain and disability ratings on the isokinetic performance of low back pain patients

OBJECTIVES: This study investigated how age, sex, height, body weight, self-efficacy beliefs, pain, and subjective disability predict the performance of low back pain patients on an isokinetic trunk muscle test. METHODS: One hundred and five patients participated in the study. Dependent variables were isokinetic flexion and extension strength measured as total work done at speeds 50, 100, and 150 degrees/second. RESULTS: The anthropometric measures were poor predictors, height being the only significant one. Body weight and age were of no relevance for the performance. Subjective pain and disability had negative effects on the performance of men, but not of women. Self-efficacy beliefs, i.e., the patient's belief in his or her capability to endure physical activities, was the most powerful predictor. CONCLUSION: For the purpose of validation, standardization, and interpretation of isokinetic performance in low back pain patients, these factors should be taken into account.     

Low back pain and its relationship to back strength and physical activity in children

OBJECTIVE: The objective of the study was to determine the occurrence of low back pain and its relationship to back strength and physical activity in children. METHODS AND MATERIALS: The study included 53 boys and 43 girls aged 10 to 19 years from a group of 116 children who had undergone isometric strength testing 4 years previously. No intervention was performed. Each child was asked five questions concerning low back pain. A questionnaire to quantify participation in athletic activities and manual labor was used as the basis for calculation of each child's activity level. Isometric back flexor and extensor strength were measured with the same method used 4 years previously. Statistical analyses were performed with appropriate correction for confounding factors. RESULTS: The frequency of low back pain and the relationship between low back pain and age, between low back pain and back strength, and between low back pain and physical activity were determined. There was a history of low back pain in 51%, and the frequency of low back pain in the past year was 35%. Eight percent of the children had been limited by low back pain, and 7% had seen a doctor for the pain. The first incident of low back pain occurred at a mean age of 12.3 years. The frequencies of a history of low back pain and of low back pain in the past year increased significantly with age (p = 0.02 and 0.01 respectively). Increased physical activity was significantly associated with a history of low back pain (p = 0.03), and increased back flexor strength was significantly associated with a history of low back pain and of low back pain in the past year (p = 0.03 and 0.008, respectively). The rate of low back flexor or strength over 4 years had a significantly positive association with the occurrence of low back pain in the past year (p = 0.008). CONCLUSIONS AND RELEVANCE: Low back pain is common in children, and, in contrast to adults, low back pain in these children was more common with increased physical activity and stronger back flexors. We believe the main causes of low back pain in children are musculotendinous strains and ligamentous sprains.     

Summary knowledge of results and task processing load

With the elbow flexed, compression of the human biceps brachii has been found to reduce twitch torque, with an approximately linear relationship being observed between the loss of torque and the applied pressure (up to 45 kPa). The decline in torque could no longer be demonstrated when the biceps muscle was stretched, by extending the elbow from a flexed position. The loss of torque in the flexed position appeared to be due to an inability of muscle sarcomeres to bulge sufficiently to take up the series elasticity at the fiber ends.     

Effects of task difficulty, goal setting, and strategy on performance of a heuristic task.

Investigated the relative contribution of goal setting and task difficulty to performance on a heuristic computer task with 128 undergraduates who attempted to solve either easy or difficult maze puzzles. Each S was assigned either an easy, moderate, or difficult goal or told to do his/her best. One month prior to the experiment, Ss responded to the Neuroticism scale of the Eysenck Personality Inventory to collect data on arousal. Data were also collected on acceptance, commitment, task complexity, and performance. Results show that both goals and task difficulty affected task performance, arousal, and perceptions of task complexity. A linear, rather than curvilinear, relationship was found between task arousal and performance. Contrary to prior research by G. A. Bassett (see record 1980-33518-001), results also show that, when the task was difficult, the setting of a difficult goal led to significantly lower performance. The decrease in performance in the difficult goal condition was attributed to the variation in performance strategy employed by these Ss as opposed to other Ss. It is argued that the setting of difficult goals may not be an effective motivational strategy when a heuristic, rather than algorithmic, solution is needed. (40 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Physical therapy in low back pain

We report on physical measures in the treatment of patients with lower back pain due to mechanical factors. Acute low back pain improves mostly without specific measures. Intervention for this condition is useful for prevention of relapses. More demanding and difficult is the treatment of chronic lumbar back pain. After an exact diagnosis, information about the disease, the therapeutic procedure and the prognosis follow in order to agree on a common therapeutic goal. To this goal, a close cooperation between physician, physiotherapist, possibly a psychologist and a social worker, is optimal. The employer should be involved in the rehabilitation on the workplace. Patients should become mobilized inspite of pain, and the return to their workplace should be prepared step by step. The most important physiotherapeutic modalities are demonstrated.     

Effects of task performance, helping, voice, and organizational loyalty on performance appraisal ratings.

Despite the fact that several studies have investigated the relationship between organizational citizenship behavior and performance appraisal ratings, the vast majority of these studies have been cross-sectional, correlational investigations conducted in organizational settings that do not allow researchers to establish the causal nature of this relationship. To address this lack of knowledge regarding causality, the authors conducted 2 studies designed to investigate the effects of task performance, helping behavior, voice, and organizational loyalty on performance appraisal evaluations. Findings demonstrated that each of these forms of behavior has significant effects on performance evaluation decisions and suggest that additional attention should be directed at both voice and organizational loyalty as important forms of citizenship behavior aimed at the organization. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Emotional arousal and task performance.

42 male Ss were exposed to either a hostility inducing or a neutral confederate and then tested on both stereotyped and nonstereotyped forms of a simple lever pressing task. As predicted, emotional arousal (hostility) had no effect on performance of the relatively stereotyped task but led to a considerable though transitory drop in performance after changeover to a nonstereotyped task requiring concentration. This result corroborates in a laboratory setting previous reports of research done in the field. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Antisaccade task performance in questionnaire-identified schizotypes

Individuals who scored high on Perceptual Aberration-Magical Ideation Scales (Per-Mag; n = 90), the Social Anhedonia Scale (SocAnh; n = 39), and control participants (n = 89) were administered saccadic refixation (prosaccade) and saccadic suppression (antisaccade) tasks. Eye movements were scored in terms of error rates and latency. None of the groups differed in terms of their performance on the prosaccade task. Both the Per-Mag (p < 0.01) and SocAnh (p < 0.05) groups exceeded the controls in terms of mean antisaccade errors. The high-risk groups did not differ from each other. Eighteen of the Per-Mag individuals and 10 of the SocAnh individuals displayed deviant antisaccade performance. These findings are particularly interesting in light of suggestive evidence that antisaccade task deficits may serve as a marker of susceptibility to schizophrenia. It is hypothesized that the individuals who scored aberrantly on the Chapman scales and displayed antisaccade performance deficits are most likely to be at risk for the development of psychosis.