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PubMedDate not supplied

[Work capacity, residual capacity and work tolerance times. A proposed measuring method].

A simple method for assessing the physical working capacity [in terms of maximal work capacity, loss of work capacity in diseased people, long-term work capacity (or critical power), endurance time] is proposed. The method consists in performing two "6 minutes workload" of different but known power and in measuring the corresponding heart rates and O2 uptakes at steady state. The effort was a "step-test" at different height of the step and rate of ascent and descent from it. The O2 uptake was measured either directly or indirectly from a nomogram (starting from the step height and the frequency of the up and down). The measured and estimated values of O2- uptake were very well correlated and this might be an indication for the method to be used in not equipped factory ambulatory or directly in workplaces. The maximal capacity to perform an effort was calculated on the basis of the linear regression between heart rate and O2-uptake, calculating the O2 maximal values (VO2MAX) from the predicted maximal heart rate (FMAX); analogously, the critical power was obtained by calculating the O2 critical values (VO2CRIT) from the predicted critical heart rate (FCRIT); the loss of work capacity is the difference between two maximal powers, the theoretical and the measured one. The endurance time was measured on the basis of the hypothesis of a linear regression between level of an effort and logarithm of the time to perform it. Finally, a few procedures to assess the actual work capacity in subjects with pulmonary or blood diseases are discussed; in these subjects the O2 transfer might be limited by ventilation disorders or by low content of haemoglobin.

Adult↗
PubMed2003

Circadian aspects of postprandial metabolism.

Time-dependent variations in the hormonal and metabolic responses to food are of importance to human health, as postprandial metabolic responses have been implicated as risk factors in a number of major diseases, including cardiovascular disease. Early work reported decreasing glucose tolerance in the evening and at night with evidence for insulin resistance at night. Subsequently an endogenous circadian component, assessed in constant routine (CR), as well as an influence of sleep time, was described for glucose and insulin. Plasma triacylglycerol (TAG), the major lipid component of dietary fat circulating after a meal, also appears to be influenced by both the circadian clock and sleep time with higher levels during biological night (defined as the time between the onset and offset of melatonin secretion) despite identical hourly nutrient intake. These time-dependent differences in postprandial responses have implications for shiftworkers. In the case of an unadapted night shift worker, meals during work time will be taken during biological night. In simulated night shift conditions the TAG response to a standard meal, preceded by either a low-fat or a high-fat premeal, was higher after a nighttime meal than during a daytime meal, and the day/night difference was larger in men than in women. In real night shift workers in Antarctica, insulin, glucose, and TAG all showed an increased response after a nighttime meal (second day of night shift) compared to a daytime meal. Night shift workers are reported to have an approximately 1.5 times higher incidence of heart disease risk and also demonstrate higher TAG levels compared with matched dayworkers. As both insulin resistance and elevated circulating TAG are independent risk factors for heart disease, it is possible that meals at night may contribute to this risk.

Blood Glucose↗
PubMed2006

Shift work and inter-individual differences in sleep and sleepiness.

Inter-individual differences in tolerance for shift work have been studied primarily in terms of external factors affecting alertness on the job or the ability to rest and sleep while at home. However, there is increasing evidence that neurobiological factors play a role as well, particularly the major processes involved in the regulation of sleep and wakefulness. These include a sleep homeostatic process seeking to balance wakefulness and sleep and a circadian process seeking to promote wakefulness during the day and sleep during the night. Shift work is associated with a temporal misalignment of these two endogenous processes. During nightwork, this misalignment makes it difficult to stay awake during the nightshift and sleep during the day. However, inter-individual variability in the processes involved in sleep/wake regulation is substantial. Recent studies have demonstrated the existence of inter-individual differences in vulnerability to cognitive deficits from sleep loss. Moreover, these inter-individual differences were shown to constitute a trait. Interestingly, self-evaluations of sleepiness did not correspond well with the trait inter-individual variability in objective levels of performance impairment during sleep deprivation. Perhaps because of this discrepancy, in operational settings, the inter-individual differences in vulnerability to sleep loss do not appear to be limited due to self-selection mechanisms. Indeed, even among a highly select group of active-duty jet fighter pilots flying a series of simulated night missions, systematic inter-individual differences in performance impairment from sleep loss were still observed. There are significant personal and economic consequences to human error and accidents caused by performance deficits due to sleep loss. It is important, therefore, to study the inter-individual differences in the regulation of sleep and wakefulness in the work environment so that cognitive impairment during shift work may be better anticipated and prevented.

Aviation↗
PubMed2004

Assessing internet survey data collection methods with ethnic nurse shift workers.

An increasing number of ethnic minorities are expected to enter the United States workforce based on projected demographic changes. This includes American Indian/Alaskan Native (AI/AN) nurses. Sociocultural influences on sleep disturbances, sleepiness, and other aspects related to shift-work tolerance are of unrecognized importance. More minority nurses are needed to provide culturally congruent care; however, AI/AN nurses represent less than 1% of nurses located throughout the American workforce. This article aims to verify the feasibility of Internet data collection (Web-based survey) methods and instrument stability as the first part of a two-phase study comparing individual differences and shift-work-related sleep disturbances between AI/AN and White non-Hispanic (WNH) nurses. In the first phase, an Internet survey was used to reach a cross-section of AI/AN and WNH nurses. The on-line survey was composed of accepted shift-work-related instruments. Items estimating sleep disturbances, sociocultural choices, time awareness, polychronicity, morningness/ eveningness, ethnic identity, and demographic questions were asked. The survey was linked to a series of Web pages describing the study purpose, inclusion and exclusion criteria, consent form, Web survey, and the second phase of the study in which subjects were invited to participate in actigraphy measurements. The survey was pilot-tested for error codes, item confusion, length, and completion time. Forced-answer questions were added asking ethnicity, age group, license type, state where licensed, and legal name on nursing license before accessing the survey. Data were saved periodically, cued by the word "continue." The database was located on a secure server and password protected. Nurses were recruited using published articles and printed advertisements, hospital e-mail systems, national nursing organization Web sites (minoritynurse.com; NANAINA.org), nursing Web site discussion groups, snow-balling, and word of mouth. The site was accessed 656 times with the Internet survey being completed by 138 WNH and 56 AI/AN nurses meeting the inclusion criteria. Except for the polychronicity measure (PAI3), instruments measuring time awareness, chronotype, and situational sleepiness achieved acceptable reliability coefficients with Internet data collection. Using pull-down menus would improve questions asking specific times. Internet data collection with different ethnic groups is possible; however, accessing the target population may be difficult. Despite extensive recruitment efforts, few AI/AN nurses participated. Computer literacy and failing to relate to the study's purpose may have limited the interest of the AI/AN nurses. It is possible to recruit nurse shift workers and collect individual difference and sleep disturbance data through the Internet; however, the researcher must remain vigilant throughout the process.

Adult↗
PubMed1990

[Chrono-type as a factor of shiftwork tolerance in women].

Almost all physiological and psychological functions of human beings reveal circadian variations. The parameters of those rhythms differ in various subjects dependently on their individual diurnal characteristics, named here chrono-type. The difference in phase of maximal arousal is particularly apparent so that it implies the distinction between the morning and the evening types. The comparative study of both chrono-types was done with regard to the subjective health, sleep disorders and disturbances, attitudes towards shiftwork and physical fitness as measured by indirect prediction of the maximal oxygen uptake. In spite of differences in the bedtime and awaking time, representatives of morning and evening type did not differ when considering the amount of sleep. Both groups slept about one hour less than subjectively required. The analysis of sleep disorders (during days with various shifts and days off) showed that their configuration was different in compared groups. Morning types more often woke before proper time and suffered from frequent mid-sleep awakenings. They had also more difficulties in falling asleep and felt tired after awakening when working night shift. Evening types reported more often difficulties in awakening (independently on work shift) and complained low well-being or tiredness after awakening when working morning or afternoon shift and during days off. The percentage of morning types reporting various sleep disturbances of external (noise, daylight) or internal (hunger, nervousness) origin was 13 to 74. The corresponding figures for evening types were 4 to 52%. Subjective health was assessed with use of a list of 74 symptoms. It was found that morning individuals significantly more frequently reported fevers and sub-febrile states, itching in heart region, pains or tightness in heart region when nervous and musculoskeletal pains. No significant differences in gastrointestinal complaints were found. Analysis of typical circulatory, respiratory and musculoskeletal syndromes revealed the lower frequency of circulatory and musculoskeletal complaints and more respiratory symptoms in evening types. This latter could be considered as the result of prevalence of smokers in this group. The prediction of maximal oxygen uptake with use of indirect Astrand-Rhythm method showed significantly higher values in evening types. Taking into account that the result of this method is based on the heart rate response to submaximal load--it is highly probable that the difference observed is due to chrono-type related difference in phase of circadian rhythm of heart rate reaction to the load applied on the same time of the day. Both studied groups differed significantly as to the percentage of persons approving the work in shifts.(ABSTRACT TRUNCATED AT 400 WORDS)

Attitude to Health↗
PubMed2000

Family responsibilities and domestic activities of US women physicians.

BACKGROUND: Women physicians may have a multiplicity of domestic roles (eg, cook, housekeeper, child care provider) that are of inherent interest and that may affect their professional lives, but are largely unstudied. DESIGN, SETTING, PARTICIPANTS, AND MAIN OUTCOME MEASURES: We report data from respondents (N = 4501) to the Women Physicians' Health Study, a cross-sectional, questionnaire-based study of a stratified random sample of US women MDs. RESULTS: Women physicians with children aged 0 to 17 years spent a median of 24.4 hours per week on child care. Women physicians typically spent half an hour per day cooking, and another half-hour per day on other housework. Little time was spent on gardening: a median of 0.05 hours (3 minutes) per week. Those performing more domestic tasks are likely to work fewer hours outside the home and to be on call less often. Women physicians who are married or widowed, have more children, have lower personal incomes, and have more highly educated and higher-earning spouses perform more domestic activities. We found no significant adverse relationship between time spent on any domestic activity and career satisfaction or mental or physical health. CONCLUSIONS: Women physicians spend little time on domestic activities that can be done for them by others, including cooking, housework, and especially gardening. Women physicians spend somewhat less time on child care and substantially less time on housework than do other US women. Despite abundant editorializing about role conflicts of women physicians, our measures of career satisfaction and mental health were not adversely affected by time spent on domestic obligations.

Adult↗
PubMed2002

Worklife and satisfaction of general internists.

BACKGROUND: Prior studies have reported relatively low job satisfaction for general internists. We used data from a large US physician survey to assess correlates of satisfaction of general internists. METHODS: The Physician Worklife Survey was mailed to a national random stratified sample of 5704 US physicians. General internists were assessed for their satisfaction, training, patient mix, work hours, the likelihood of recommending their specialty to medical students, and job stability. We then compared them with a specialist sample (internal medicine subspecialists [IMSSs]) and a primary care sample (family physicians [FPs]). Logistic regression was used to model predictors of satisfaction, stress, and medical student recruitment. RESULTS: There were 2326 respondents (adjusted response rate, 52%): 450 (19%) were general internists; 502 (22%), FPs; and 438 (19%), IMSSs. General internists were less satisfied than were IMSSs with their relationships with colleagues and with patient care issues (P<.01 for both) and less satisfied than were FPs with community ties (P =.001). Global job, career, and specialty satisfaction were significantly lower for general internists vs FPs and IMSSs (P<.05). General internists spent proportionately more of their work week in the hospital than did FPs (20% vs 13%; P<.001) and more time providing outpatient care than did IMSSs (56% vs 42%; P<.001). General internists had more patients with complex medical and psychosocial problems than did FPs (P<.01) but fewer patients with complex medical problems than did IMSSs (P<.001). Higher satisfaction for general internists was associated with older physician age, less time pressure during office visits, fewer work hours, and fewer patients with complex psychosocial problems (P<.05 for all). General internists were less likely than were FPs to recommend their specialty to medical students (P<.001). Specialty satisfaction, female gender, and control of hassles predicted medical student recruitment by general internists. CONCLUSIONS: General internists' role of caring for patients with complex problems is associated with lower levels of satisfaction than for IMSSs and FPs. Adjusting caseload for patient complexity, expanding time for office visits, and additional training in the care of patients with psychosocially complex problems may improve the job satisfaction of general internists and medical student recruitment into the specialty.

Adult↗
PubMedDate not supplied

Burnout and internal medicine resident work-hour restrictions.

BACKGROUND: Burnout is very common in internal medicine residents. Effective July 2003, all residents were restricted to work less than an average of 80 hours per week and no more than 30 hours of continuous duty for patient care and educational obligations. We evaluated rates of burnout in internal medicine residents before and after the implementation of the new work-hour restriction. METHODS: University of Colorado Health Science Center internal medicine residents were surveyed in May 2003 and May 2004. The survey contained the Maslach Burnout Inventory, organized into 3 subscales (ie, emotional exhaustion, depersonalization, and personal accomplishment); the Primary Care Evaluation of Mental Disorders depression screen; and self-reported quality of care and education. RESULTS: The response rate was 87% (121 of 139 residents) and 74% (106 of 143 residents) in 2003 and 2004, respectively. Self-reported hours worked decreased from a mean of 74.6 to 67.1 (P = .003). In 2004, 13% fewer residents experienced high emotional exhaustion (42% vs 29%; P = .03). There was a trend toward fewer residents with high depersonalization (61% vs 55%; P = .13) and fewer residents with a positive depression screen (51% vs 41%; P = .11). Personal accomplishment did not change. The assessment of self-reported quality of care did not significantly change from 2003 to 2004. Residents reported attending fewer educational conferences per month (18.99 vs 15.56; P = .01). Overall residency satisfaction decreased 6 mm on a 100-mm visual analogue score (P = .02). CONCLUSIONS: Burnout continues to be a major problem. Reducing hours may be the first step to reduce burnout but may also affect education and quality of care.

Adult↗
PubMedDate not supplied

The effects of work-hour limitations on resident well-being, patient care, and education in an internal medicine residency program.

BACKGROUND: The Accreditation Council for Graduate Medical Education work-hour limitations (WHLs) were implemented in July 2003. Effects on resident well-being, patient care, and education are not well understood. We investigated these effects of WHLs. METHODS: Self-administered survey of internal medicine residents in a university-based residency program in Seattle, Wash. Part of this survey was identical to one completed at our institution in 2001, permitting comparison of burnout, career satisfaction, and depression before and after WHLs. We surveyed 161 internal medicine residents, with 118 respondents (response rate, 73%). We measured resident well-being using the Maslach Burnout Inventory, a validated screening questionnaire for depression, and a previously described questionnaire for career satisfaction. We developed questions about overall agreement with implementation of WHLs and effects on resident well-being, patient care, and education. RESULTS: Comparison with the 2001 survey demonstrated an increase in the proportion of residents satisfied with their career (66% to 80%; P = .02) and a decrease in the proportion meeting criteria for emotional exhaustion (53% to 40%; P = .05). Slightly more residents reported a negative effect of WHLs on patient care (37%) than they did a positive (29%) or a neutral (34%) effect, and more reported a negative effect on their education (47%) than they did a positive (32%) or a neutral (21%) effect. Overall, most residents (65%) approved of WHLs. CONCLUSIONS: Internal medicine residents approve of WHLs overall and report benefits to their well-being. However, they also report negative effects on patient care and resident education.

Burnout, Professional↗
PubMed2002

Infant colic: empirical evidence of the absence of an association with source of early infant nutrition.

BACKGROUND: The etiology of infant colic remains unknown, despite an abundance of research on the topic. OBJECTIVE: To determine whether breastfeeding has a protective effect in colic's development. DESIGN: A prospective cohort study of 856 mother-infant dyads. Eligible participants included English-speaking adult residents of a region in Ontario, who gave birth, at term, to a live singleton whose birth weight was appropriate for gestational age. Self-administered questionnaires, mailed to mothers at 1 and 6 weeks post partum, requested information on several infant and maternal factors, including source of infant nutrition (exclusively breastfed, complementary fed, and exclusively formula fed). Cases of colic were identified by applying modified Wessel criteria to data recorded in the Barr Baby Day Diary or by interpreting responses to the Ames Cry Score. MAIN OUTCOME MEASURES: Prevalence of colic among breastfed, formula-fed, and complementary-fed infants; and adjusted odds ratios (AORs) reflecting the prevalence of colic among formula- and complementary-fed infants relative to those who were breastfed. RESULTS: Of 856 mothers, 733 (86%) completed the first questionnaire and 617 (72%) completed the second questionnaire. Overall, the prevalence of colic at 6 weeks was 24%. No association was seen between the source of infant nutrition and colic's development. In multivariate analyses, higher levels of maternal trait anxiety (AOR, 1.22; 95% confidence interval [CI], 0.96-1.54), maternal alcohol consumption at 6 weeks (AOR, 1.57; 95% CI, 1.03-2.40), and shift work during pregnancy (AOR, 1.27; 95% CI, 0.73-2.21) were associated with an increased likelihood of colic, after controlling for feeding method, maternal age, and parity. In these same analyses, being married or having a common-law partner (AOR, 0.30; 95% CI, 0.10-0.87) and being employed full-time during pregnancy (AOR, 0.60; 95% CI, 0.32-1.14) were associated with a reduced likelihood of colic. CONCLUSIONS: Breastfeeding did not have a protective effect on the development of colic. Although colic was statistically associated with several variables, including preexisting maternal anxiety, much of colic's etiology remains unexplained.

Adult↗
PubMed2002

Employment in adults with congenital heart disease.

OBJECTIVE: To evaluate job participation, career-related problems, and actual job problems in adults with complex congenital heart disease (CHD) compared with adults with mild CHD and reference groups. DESIGN: Cross-sectional study. SETTING: Patients were randomly selected from the archives of the Department of Pediatric Cardiology, Leiden University Medical Center, Leiden, the Netherlands. PATIENTS AND MAIN OUTCOME MEASURES: In total, 76 patients with complex CHD and 80 with mild CHD (age range, 17-32 years) completed a self-reported questionnaire on employment and handicaps, with reference data available (response rate, 70%). RESULTS: In the study groups, 45 (59%) of 76 patients with complex CHD had a paid job compared with 61 (76%) of 80 patients with mild CHD. Patients older than 25 years with complex CHD had significantly lower job participation (64%) than the general population (83%). Multiple logistic regression showed that type of CHD and level of education were significantly and independently related to job participation (odds ratio, 4.8; 99% confidence interval, 1.2-19.6; and odds ratio, 4.7; 99% confidence interval, 1.3-17.2, respectively). Of the 76 patients with complex CHD, 42 (55%) experienced disease-related career problems, in contrast to only 1 patient with mild CHD. Both CHD groups had more job-related mobility handicaps than did the reference group. However, in the mild CHD group, handicaps could be attributed to additional noncardiac diseases. CONCLUSIONS: Patients with complex CHD have reduced job participation compared with patients with mild CHD and the general population. Many receive disability benefits or experience career problems or job handicaps. Career counseling focusing on physical abilities and level of education may help prevent or reduce these job-related problems.

Adolescent↗