Demographic and illness-related variables associated with HIV-related fatigue

Quiescence Enhances Survival during Viral Infection in Caenorhabditis elegans

Infection causes reduced activity, anorexia, and sleep, which are components of the phylogenetically conserved but poorly understood sickness behavior. We developed a Caenorhabditis elegans model to study quiescence during chronic infection, using infection with the Orsay virus. The Orsay virus infects intestinal cells yet strongly affects behavior, indicating gut-to-nervous system communication. Infection quiescence has the sleep properties of reduced responsiveness and rapid reversibility. Both the ALA and RIS neurons regulate virus-induced quiescence though ALA plays a more prominent role. Quiescence-defective animals have decreased survival when infected, indicating a benefit of quiescence during chronic infectious disease. The survival benefit of quiescence is not explained by a difference in viral load, indicating that it improves resilience rather than resistance to infection. Orsay infection is associated with a decrease in ATP levels, and this decrease is more severe in quiescence-defective animals. We propose that quiescence preserves energetic resources by reducing energy expenditures and/or by increasing extraction of energy from nutrients. This model presents an opportunity to explore the role of sleep and fatigue in chronic infectious illness.

Survival trends among people living with human immunodeficiency virus on antiretroviral treatment in two rural districts in Ghana

BACKGROUND

The human immunodeficiency virus (HIV) has caused a lot of havoc since the early 1970s, affecting 37.6 million people worldwide. The 90-90-90 treatment policy was adopted in Ghana in 2015 with the overall aim to end new infections by 2030, and to improve the life expectancy of HIV seropositive individuals. With the scale-up of Highly Active Antiretroviral Therapy, the lifespan of People Living with HIV (PLWH) on antiretrovirals (ARVs) is expected to improve. In rural districts in Ghana, little is known about the survival probabilities of PLWH on ARVs. Hence, this study was conducted to estimate the survival trends of PLWH on ARVs.

METHODS

A retrospective evaluation of data gathered across ARV centres within Tatale and Zabzugu districts in Ghana from 2016 to 2020 among PLWH on ARVs. A total of 261 participants were recruited for the study. The data was analyzed using STATA software version 16.0. Lifetable analysis and Kaplan-Meier graph were used to assess the survival probabilities. "Stptime" per 1000 person-years and the competing risk regression were used to evaluate mortality rates and risk.

RESULTS

The cumulative survival probability was 0.8847 (95% CI: 0.8334-0.9209). The overall mortality rate was 51.89 (95% CI: 36.89-72.97) per 1000 person-years. WHO stage III and IV [AHR: 4.25 (95%CI: 1.6-9.71) p = 0.001] as well as age group (50+ years) [AHR: 5.02 (95% CI: 1.78-14.13) p = 0.002] were associated with mortality.

CONCLUSION

Survival probabilities were high among the population of PLWH in Tatale and Zabzugu with declining mortality rates. Clinicians should provide critical attention and care to patients at HIV WHO stages III and IV and intensify HIV screening at all entry points since early diagnosis is associated with high survival probabilities.

Experience Pandemic Fatigue? Social Media Use May Play a Role: Testing a Model of Pandemic Fatigue Development from a Social Media Perspective

Recently, the World Health Organization noted the increasing signs of pandemic fatigue around the world and repeatedly warned the public to continue to stay cautious. The current study explores whether social media use plays a role in the formation and development of pandemic fatigue. Drawing on a survey of 849 social media users in China, the findings indicated that different social media behaviors play different roles in affecting pandemic fatigue. Specifically, social interaction use is negatively associated with pandemic fatigue, mediated by more social support and reduced hopelessness. Active content use contributes to pandemic fatigue development, an association explained by information overload and desensitization. Notably, passive content use is found to trigger reactance but is negatively associated with pandemic fatigue, which is fully mediated by reduced information overload. This study seeks to understand how pandemic fatigue is associated with social media use and to explicate the underlying mechanism. The implications of the findings and directions for future research are discussed.

Design and rationale of a pilot randomized clinical trial investigating the use of a mHealth app for sarcoidosis-associated fatigue

Fatigue is the most reported symptom in patients with sarcoidosis (SPs) and is a significant predictor of decreased quality of life that is strongly associated with stress and negative mood states. Few medications exist for treating fatigue in SPs, and outpatient physical rehabilitation programs are limited by availability and cost. Sarcoidosis in the US predominantly impacts minorities and underserved populations who are of working age and often have limited resources (e.g., financial, transportation, time off work) that may prevent them from attending in-person programs. The use of mobile health (mHealth) is emerging as a viable alternative to provide access to self-management resources to improve quality of life. The Sarcoidosis Patient Assessment and Resource Companion (SPARC) App is a sarcoidosis-specific mHealth App intended to improve fatigue and stress in SPs. It prompts SPs to conduct breathing awareness meditation (BAM) and contains educational modules aimed at improving self-efficacy. Herein we describe the design and methods of a 3-month randomized control trial comparing use of the SPARC App (10-min BAM twice daily) to standard care in 50 SPs with significant fatigue (FAS ≥22). A Fitbit® watch will provide immediate heartrate feedback after BAM sessions to objectively monitor adherence. The primary outcomes are feasibility and usability of the SPARC App (collected monthly). Secondary endpoints include preliminary efficacy at improving fatigue, stress, and quality of life. We expect the SPARC App to be a useable and feasible intervention that has potential to overcome barriers of more traditional in-person programs.

Use of Long-Acting Therapies for HIV Care in Italy: Are People Living with HIV Prepared for Change? A Cross-Sectional Study

Two hundred two people living with HIV (PLWH) selected from outpatients at the Infectious Disease Institute, Fondazione Policlinico Universitario A. Gemelli IRCCS, in Rome (Italy) were consecutively enrolled from May to July 2021. We used an anonymous telephone questionnaire to investigate opinions of PLWH about combined antiretroviral (ARV) therapy and long-acting (LA) formulations of ARVs. All invited participants completed the questionnaire (100%). We found that most PLWH evaluated taking HIV pills for the rest of their life as a continuous, but undemanding commitment (61.4%; n = 124), although they were willing to stop the daily intake of HIV drugs (78.2%, n = 158). Moreover, most PLWH were unaware of the existence of LA therapies at the time of the investigation (60.4%, n = 122). Almost half the PLWH evaluated the need for injections in the hospital as an obstacle (51.4%, n = 104). Regarding the preference between monthly injections and taking pills everyday, most PLWH (68.8%, n = 139) stated that the injection was more advantageous than pills even if they had some pain/swelling at the injection site. The concern about LA therapy indicated most by PLWH was the possible lower efficacy of the drug (83.7%, n = 169). Regarding the possible benefits of LA therapy, those reported most by PLWH were feeling freer because they did not have to remember to take pills everyday (68,8%, n = 139). In conclusion, to date, PLWH in our cohort seem willing to accept LA therapy, but still show some concern about the efficacy of the new therapy and the obligation to come to the hospital to receive it. Thus, clinicians must take into account the needs of their patients and help them overcome their concerns to facilitate the transition to this new therapeutic modality. Clinical Trial Registration Number ID: 2424.

A Biopsychosocial Approach to HIV Fatigue: A Cross-Sectional and Prospective Analysis to Identify Key Modifiable Factors

This study aimed to identify the prevalence and predictors of current fatigue and fatigue at 1-year follow-up, in people with HIV. Participants were recruited from HIV outpatient clinics in London, England. We explored a range of bio-psychosocial factors associated with current fatigue severity, identifying the most salient factors in a multifactorial model. A prospective study explored the predictive value of specific psychological and behavioral factors in predicting fatigue severity at one year. Sixty-four of 131 (49%) participants met the criteria for clinically significant fatigue at baseline. Psychological and behavioral variables, but not immune-virologic markers or antiretroviral treatment, were associated with current fatigue severity. In the multifactorial model, catastrophizing and distress independently predicted current fatigue severity. Higher levels of fatigue at 1 year was predicted by baseline catastrophizing, symptom focusing, distress and sleep quality, when controlling for baseline fatigue, clinical and demographic variables. These findings suggest psychological and behavioral factors are important in the maintenance of fatigue in people with HIV and identify potential opportunities for treatment. Future interventions for fatigue in HIV should not only address anxiety, depression and distress but could be optimized by targeting psychological processes such as catastrophic thinking styles and symptom focusing.

Experience of fatigue and associated factors among adult people living with HIV attending ART clinic: a hospital-based cross-sectional study in Ethiopia

OBJECTIVE

This study aimed to determine the prevalence of fatigue and the factors associated among adult people living with HIV attending antiretroviral therapy clinic in Gondar town, Ethiopia.

DESIGN

Cross-sectional.

SETTING

Governmental health facility that provides HIV care in Gondar town.

OUTCOME MEASURE

Fatigue is defined by nine items version Fatigue Severity Scale.

PARTICIPANTS

Adult (aged 18 and above) people living with HIV in Gondar town (n=392).

RESULT

A total of 408 HIV seropositive adults were approached for consent, among which 392 participants consented to participate in this study, with a response rate of 96.1%. The mean age of the participants was 40.5±8.5 years. The prevalence of HIV-related fatigue was 53.3% and about 66% of women living with HIV experienced fatigue. The factors associated with fatigue experience were; female gender (adjusted OR (AOR): 2.61, 95% CI 1.01 to 5.3), being married (AOR: 0.18, 95% CI 0.10 to 0.9), low income (AOR: 7.1, 95% CI 4.6 to 22.15), unemployed (AOR: 2.79, 95% CI 1.19 to 9.84), parity (AOR: 4.87, 95% CI 2.18 to 17.9), being anaemic (AOR: 12.45, 95% CI 5.6 to 41.01), depression (AOR: 4.51, 95% CI 1.91 to 11.20), mild weight loss (AOR: 4.2 95% CI 2.56 to 13.9) and moderate weight loss (AOR: 5.1, 95% CI 1.85 to 16.12), respectively.

CONCLUSION

The findings of this study revealed that experiencing fatigue is quite common among adult people living with HIV. It is important for the healthcare professionals and people living with HIV to understand; the possible causes of fatigue, remedies and ways to reclaim energy. The predisposing factors and complications that cause fatigue should be aggressively diagnosed and treated by the clinicians. Further qualitative studies exploring the reasons for experiencing HIV-related fatigue might help designing interventions.

Perceived HIV-related physical fatigue, sociodemographic characteristics and physical activity: A cross-sectional study

AIMS AND OBJECTIVES

To get a deeper understanding of correlates of perceived HIV-related fatigue by exploring its associations with sociodemographic characteristics and physical activity level of HIV-infected people.

BACKGROUND

Previous studies on HIV-related fatigue have mainly focused on physiological and psychological characteristics, but few have considered its associations with sociodemographic variables. In addition, while physical activity has been found to reduce acute fatigue among HIV-infected people, its links with chronic HIV-related fatigue remain to be explored.

DESIGN

The study employed an observational and cross-sectional survey design. The manuscript was organised according to STROBE guidelines.

METHOD

A total of 560 people living with HIV in France completed a measure of perceived physical fatigue using the Fatigue Intensity Scale. The predictors targeted sociodemographic characteristics and two measures of individuals' reported level of physical activity. Data were analysed by a stepwise multiple regression model.

RESULTS

The results showed that lower age, higher physical activity level and socio-economic status were significantly associated with reduced perceived physical fatigue, explaining 25% of the variance.

CONCLUSIONS

The results highlighted the importance of considering sociodemographic and lifestyle characteristics to better characterise HIV-related fatigue, in particular in an era where HIV as a chronic illness challenges questions of quality of life throughout increasingly longer lifespans.

RELEVANCE TO CLINICAL PRACTICE

The results of this study have implications for HIV care professionals in terms of improving strategies for managing chronic fatigue or promoting physical activity according to more specific profiles of HIV-infected people.

Fatigue is associated with high prevalence and severity of physical and emotional symptoms in patients on chronic hemodialysis

PURPOSE

The symptom burden of fatigued hemodialysis patients is poorly known. We aimed to investigate possible differences in the prevalence and severity of symptoms between fatigued and not fatigued patients on chronic hemodialysis.

METHODS

All prevalent patients on chronic hemodialysis referring to the Hemodialysis Service between January 2016 and June 2017 were considered eligible. The Dialysis Symptom Index (DSI) questionnaire was performed during the dialysis treatment. Patients underwent assessment of fatigue using the Italian version of the vitality scale of the SF-36 (SF-36VS).

RESULTS

We studied 137 patients: 107 (78.1%) were fatigued and 30 (31.9%) were non-fatigued. The median [95% CI] number of symptoms was 15 [14-16] for patients who reported fatigue and 9 [8-19] for the non-fatigued (P < 0.0001). In fatigued patients, with respect to non-fatigued ones, the prevalence of dry skin, itching, muscle soreness, bone or joint pain, restless legs, shortness of breath, feeling sad, feeling anxious, difficulty concentrating, and difficulty becoming sex aroused was significantly higher. Restless legs, feeling sad, difficulty concentrating, and difficulty becoming sex aroused were symptoms independently associated with fatigue. The severity of dry skin, trouble staying asleep, and bone/joint pain was higher in fatigued patients.

CONCLUSION

Fatigued hemodialysis patients report suffering from physical and emotional symptoms more frequently than non-fatigued patients. This finding suggests the need to accurately and routinely define the symptom burden of chronic hemodialysis patients and may help to investigate eventually common underlying pathogenic mechanisms of symptoms in these patients.

Exercise stereotypes and fatigue in people living with HIV: does self-efficacy play a mediating or a moderating role?

Background

Recent research suggests that exercise stereotypes may influence physical activity through ego depletion and internalization mechanisms. The objective of this study was to better understand exercise stereotypes mechanisms among people living with HIV (PLHIV) by further examining the role of exercise self-efficacy and perceived physical fatigue in the relationship between exercise stereotypes and physical activity.

Methods

Three hundred five people living with HIV were recruited to provide data on their stereotypes related to exercise, exercise self-efficacy, perceived physical fatigue as well as their level of physical activity (PA).

Results

From the different models tested, the serial mediation model with exercise self-efficacy and perceived physical fatigue as mediators of the relationship between exercise stereotypes and PA, as well as the moderated mediation model with exercise selfefficacy as a moderator of exercise stereotypes and perceived physical fatigue a mediator, provided good fits to the data. However, the moderated mediation model (with indirect associations between negative exercise stereotypes and PA via perceived physical fatigue being moderated by exercise self-efficacy) explained the most variance in PA (R2 = .27).

Conclusion

The moderated mediation model suggests that exercise stereotypes might influence PA through ego depletion mechanisms and be tempered by exercise self-efficacy.

Exploring our understanding of fatigue among adolescents living with HIV: Highlighting the unknown

Due to antiretroviral therapies, HIV is now a chronic illness rather than a terminal disease. Chronic symptoms, including fatigue, should be identified and managed to prevent or minimise their potential negative consequences. We apply a Symptom Management Model to conceptualise fatigue among adolescents with HIV. In the context of minimal research, we seek to identify a research agenda for resource-constrained contexts, where HIV prevalence remains high and treatment adherence is a significant problem. By better understanding and addressing the symptom of fatigue, treatment adherence, occupational, social and emotional functioning could be improved. We highlight conceptual, methodological and measurement-related caveats.

To be or not to be sick and tired: Managing the visibility of HIV and HIV-related fatigue

This article takes a new direction in exploring HIV-related fatigue by adopting a qualitative interactionist approach. We analyse the social meanings attributed to fatigue among people living with HIV in France, the social gains and losses of its visibility and the social frames that condition its discursive and physical expression. The two-part methodology combines grounded theory analysis of 50 transcribed unstructured interviews conducted across France and participant observations within four HIV-related associations. Results reveal that the visibility of fatigue is in part dependent on the visibility of this stigmatized illness. The expression of fatigue is therefore closely linked with disclosure and concerns about HIV stigma. The degree to which HIV and HIV-related fatigue are rendered (in)visible also depends on structural factors including gender prescriptions, as well as context effects such as the type of social or 'care' relations involved in the social frame of interaction.

Fatigue in HIV-Infected People: A Three-Year Observational Study

CONTEXT

HIV-related fatigue remains the most frequent complaint of seropositive patients.

OBJECTIVES

To describe the natural course of fatigue in HIV infection, in a sample (n=128) followed for a three-year period.

METHODS

A longitudinal prospective design was used to determine what factors influenced changes in fatigue intensity and fatigue-related impairment of functioning in a community-dwelling sample of HIV-infected individuals. Participants were followed every six months for a three-year period. At each study visit, we collected data on a large number of physiological and psychosocial markers that have been shown to be related to fatigue in HIV-infected people. At three month intervals between study visits, we collected data on fatigue via mailed questionnaires.

RESULTS

Fatigue in HIV infection is largely a result of stressful life events, and is closely tied to the anxiety and depression that accompany such events. Fatigue did not remit spontaneously over the course of the study, indicating the need for interventions to ameliorate this debilitating symptom.

CONCLUSION

Intervening to help people who are suffering from HIV-related fatigue to deal with stressful life events may help to ameliorate this debilitating symptom.

Factors associated with fatigue in acquired immunodeficiency syndrome patients with antiretroviral drug adverse reactions: a retrospective study

OBJECTIVE

To retrospectively study the prevalence of fatigue and factors associated with fatigue among acquired immunodeficiency syndrome (AIDS) patients with antiretroviral drug adverse reactions.

METHODS

Data were collected from case report forms (CRFs) for a project funded by the 11th National 5-year Special Science and Technology Program on Major Infectious Diseases. Fatigue was defined by patient self-report. The outcomes were the prevalence of fatigue and the potential risk factors of fatigue. Univariate and multivariate logistic regression analyses were conducted to identify the factors associated with fatigue.

RESULTS

Among the 228 subjects, the prevalence of fatigue was 86.8%. In univariate analysis, the significant differences in demographic characteristics between patients with and without fatigue were: gender [OR = 2.29; 95% CI (1.05-4.98)], education level [OR = 0.40; 95% CI (0.18-0.85)], anemia [OR = 3.80; 95% CI (1.27-11.31)], time of HIV diagnosis [OR = 0.29; 95% CI (0.13-0.65)], and route of infection [OR = 0.14; 95% CI (0.06-0.32)]. Abnormal taste and rapid pulse were more commonly seen in patients with fatigue (P < 0.05), while abdominal distension and lumbar soreness were encountered less often in patients with fatigue (P < 0.05). Multivariate analysis showed that the four main factors associated with fatigue were anemia [OR = 3.50; 95% CI (1.01-12.15)], route of infection [OR = 3.40; 95% CI (1.21-9.58); P = 0.02 < 0.05], lumbar soreness [OR = 0.06; 95% CI (0.02-0.18); P = 0.000 < 0.05], and rapid pulse [OR = 10.58; 95% CI (2.16-51.75); P = 0.004 < 0.05].

CONCLUSION

This study demonstrated that fatigue is common (86.8% prevalence) in AIDS patients with antiretroviral drug adverse reactions, and that anemia, route of infection (i.e., non-commercial blood donation) and rapid pulse were risk factors, while lumbar soreness was a protective factor related to fatigue. More attention should be paid to fatigue and more efforts should be made to find ways to prevent, control and eliminate this symptom in AIDS patients with antiretroviral drug adverse reactions.

Intensity, chronicity, circumstances, and consequences of HIV-related fatigue: a longitudinal study

HIV-related fatigue remains the most troubling complaint of seropositive people. Researchers often use tools to measure fatigue that were developed for other patient populations; thus, the measurement of fatigue specific to HIV is needed. This article describes results from the HIV-Related Fatigue Scale (HRFS) including: (a) the variability in intensity and chronicity of HIV-related fatigue, (b) the circumstances surrounding changes in fatigue, (c) the impact of fatigue on activities of daily living (ADLs), and (d) the consequences of HIV-related fatigue. We collected data every 3 months over a 3-year period from 128 people. HIV-related fatigue was chronic and did not appear to remit spontaneously; those who were the most fatigued at the beginning of the study remained the most fatigued over 3 years. Fatigue interfered more with instrumental activities of daily living than basic ADLs; it also interfered with work, family, and social life. Stress and depression increased fatigue.

Measurement of fatigue in cancer, stroke, and HIV using the Functional Assessment of Chronic Illness Therapy - Fatigue (FACIT-F) scale

OBJECTIVE

Given the importance of fatigue in cancer, stroke and HIV, we sought to assess the measurement properties of a single, well-described fatigue scale in these populations. We hypothesized that the psychometric properties of the Functional Assessment of Chronic Illness Therapy - Fatigue (FACIT-F) subscale would be favorable and that the scale could serve as a useful indicator of fatigue in these populations.

METHODS

Patients were eligible for the study if they were outpatients, aged 18 or older, with a diagnosis of cancer (n=297), stroke (n=51), or HIV/AIDS (n=51). All participants were able to understand and speak English. Patients answered study-related questions, including the FACIT-F using a touch-screen laptop, assisted by the research assistant as necessary. Clinical information was abstracted from patients' medical records.

RESULTS

Item-level statistics on the FACIT-F were similar across the groups and internal consistency reliability was uniformly high (α>0.91). Correlations with performance status ratings were statistically significant across the groups (range r=-0.28 to -0.80). Fatigue scores were moderately to highly correlated with general quality of life (range r=0.66-0.80) in patients with cancer, stroke, and HIV. Divergent validity was supported in low correlations with variables not expected to correlate with fatigue.

CONCLUSIONS

Originally developed to assess cancer-related fatigue, the FACIT-F has utility as a measure of fatigue in other populations, such as stroke and HIV. Ongoing research will soon allow for comparison of FACIT-F scores to those obtained using the fatigue measures from the Patient-Reported Outcomes Measurement Information System (PROMIS®; www.nihpromis.org) initiative.

Patterns of morning and evening fatigue among adults with HIV/AIDS

AIMS AND OBJECTIVES

Describe patterns of morning and evening fatigue in adults with HIV and examine their relationship to demographic and clinical factors and other symptoms.

BACKGROUND

Most studies of HIV-related fatigue assess average levels of fatigue and do not address its diurnal fluctuations. Patterns of fatigue over the course of the day may have important implications for assessment and treatment.

DESIGN

A cross-sectional, correlational design was used with six repeated measures over 72 hours.

METHOD

A convenience sample of 318 HIV-infected adults was recruited in San Francisco. Socio-demographic, clinical and symptom data were collected with questionnaires. CD4+ T-cell count and viral load were obtained from medical records. Participants completed a four-item version of the Lee Fatigue Scale each morning and evening for three consecutive days. Participants were grouped based on their diurnal pattern of fatigue (high evening only, high morning only, high morning and evening and low morning and evening). Group comparisons and logistic regression were used to determine the unique predictors of each fatigue pattern.

RESULTS

The high evening fatigue pattern was associated with anxiety and the high morning pattern was associated with anxiety and depression. The morning fatigue pattern showed very little fluctuation between morning and evening, the evening pattern showed the largest fluctuation. The high morning and evening pattern was associated with anxiety, depression and sleep disturbance and this group reported the most fatigue-related distress and interference in functioning.

CONCLUSIONS

These results provide initial evidence for the importance of assessing the patient's daily pattern of fatigue fluctuation, as different patterns were associated with different symptom experiences and perhaps different aetiologies.

RELEVANCE TO CLINICAL PRACTICE

Different fatigue patterns may benefit from tailored intervention strategies. Management of depressive symptoms could be tested in patients who experience high levels of morning fatigue.

Physiological and psychosocial factors that predict HIV-related fatigue

Fatigue is one of the most common and debilitating symptoms experienced by HIV-infected people. We report the results of our longitudinal analysis of physiological and psychosocial factors that were thought to predict changes in HIV-related fatigue in 128 participants over a 1-year period, in an effort to sort out the complex interplay among a comprehensive set of physiological and psychosocial variables. Physiological measures included hepatic function (aspartate aminotransferase, alanine aminotransferase, gamma glutamyl transpeptidase, alkaline phosphatase, total bilirubin, hepatitis C status), thyroid function (thyroid stimulating hormone, thyroxine), HIV viral load, immunologic function (CD4, CD8, CD4/CD8 ratio, CD16, CD8CD38), gonadal function (testosterone, dehydroepiandrosterone), hematologic function (hemoglobin, hematocrit, serum erythropoietin), and cellular injury (lactic acid). Psychosocial measures included childhood and adult trauma, anxiety, depression, social support, stressful life events, and post-traumatic stress disorder (PTSD). Unemployment, not being on antiretroviral therapy, having fewer years since HIV diagnosis, more childhood trauma, more stressful life events, less social support, and more psychological distress (e.g., PTSD, anxiety and depression) put HIV-infected persons at risk for greater fatigue intensity and fatigue-related impairment in functioning during 1-year follow-up. Physiological variables did not predict greater fatigue. Stressful life events had both direct and indirect effects on fatigue.

Bedside-to-Bench conference: research agenda for idiopathic fatigue and aging

The American Geriatrics Society, with support from the National Institute on Aging and the John A. Hartford Foundation, held its fifth Bedside-to-Bench research conference, "Idiopathic Fatigue and Aging," to provide participants with opportunities to learn about cutting-edge research developments, draft recommendations for future research, and network with colleagues and leaders in the field. Fatigue is a symptom that older persons, especially by those with chronic diseases, frequently experience. Definitions and prevalence of fatigue may vary across studies, across diseases, and even between investigators and patients. The focus of this review is on physical fatigue, recognizing that there are other related domains of fatigue (such as cognitive fatigue). Many definitions of fatigue involve a sensation of "low" energy, suggesting that fatigue could be a disorder of energy balance. Poor energy utilization efficiency has not been considered in previous studies but is likely to be one of the most important determinants of fatigue in older individuals. Relationships between activity level, capacity for activity, a tolerable rate of activity, and a tolerable fatigue threshold or ceiling underlie a notion of fatiguability. Mechanisms probably contributing to fatigue in older adults include decline in mitochondrial function, alterations in brain neurotransmitters, oxidative stress, and inflammation. The relationships between muscle function and fatigue are complex. A number of diseases (such as cancer) are known to cause fatigue and may serve as models for how underlying impaired physiological processes contribute to fatigue, particularly those in which energy utilization may be an important factor. A further understanding of fatigue will require two key strategies: to develop and refine fatigue definitions and measurement tools and to explore underlying mechanisms using animal and human models.

Predictors and treatment strategies of HIV-related fatigue in the combined antiretroviral therapy era

OBJECTIVE

To assess predictors and reported treatment strategies of HIV-related fatigue in the combined antiretroviral (cART) era.

METHOD

Five databases were searched and reference lists of pertinent articles were checked. Studies published since 1996 on predictors or therapy of HIV-related fatigue measured by a validated instrument were selected.

RESULTS

A total of 42 studies met the inclusion criteria. The reported HIV-related fatigue prevalence in the selected studies varied from 33 to 88%. The strongest predictors for sociodemographic variables were unemployment and inadequate income. Concerning HIV-associated factors, the use of cART was the strongest predictor. Comorbidity and sleeping difficulties were important factors when assessing physiological influences. Laboratory parameters were not predictive of fatigue. The strongest and most uniform associations were observed between fatigue and psychological factors such as depression and anxiety. Reported therapeutic interventions for HIV-related fatigue include testosterone, psycho-stimulants (dextroamphetamine, methylphenidate hydrochloride, pemoline, modafinil), dehydroepiandrosterone, fluoxetine and cognitive behavioural or relaxation therapy.

CONCLUSION

HIV-related fatigue has a high prevalence and is strongly associated with psychological factors such as depression and anxiety. A validated instrument should be used to measure intensity and consequences of fatigue in HIV-infected individuals. In the case of fatigue, clinicians should not only search for physical mechanisms, but should question depression and anxiety in detail. There is a need for intervention studies comparing the effect of medication (antidepressants, anxiolytics) and behavioural interventions (cognitive-behavioural therapy, relaxation therapy, graded exercise therapy) to direct the best treatment strategy. Treatment of HIV-related fatigue is important in the care for HIV-infected patients and requires a multidisciplinary approach.

Chronicity and remission of fatigue in patients with established HIV infection

Fatigue is one of the most common and debilitating complaints of HIV-positive individuals, potentially leading to important functional limitations. We recruited 128 HIV-positive individuals (fatigued and nonfatigued) between March 2005 and May 2006; 66% were male, 66% were African American, 45% had greater than a high school education, 67% were unemployed, and ages ranged from 26-66 (median, 44). Every 3 months for 15 months, participants completed a 56-item self-report fatigue scale developed and validated by the authors. Participants were classified as fatigued or not fatigued at each assessment and received scores for fatigue intensity and impact of fatigue on functioning. We used linear mixed-effects models to assess longitudinal variation in fatigue scores and generalized estimating equations for binary outcomes to model predictors of fatigue remission among those fatigued at baseline. At baseline, 88% of the sample was fatigued. Fatigue measures were highly correlated across time points (rho 0.63-0.85 [intensity], 0.63-0.80 [functioning]) and showed no evidence of overall improvement, deterioration, or convergence over time. Predictors of lower fatigue scores included higher income, employment, longer time since HIV diagnosis, and antiretroviral therapy use. Those employed at baseline were likely to show improvements in fatigue while those unemployed were not. Of those fatigued at baseline, 11% experienced remission during follow-up; remission was associated with Caucasian race and employment. In summary, fatigue intensity and related functional limitations were persistent, stable, and unlikely to remit over 15 months of follow-up in this sample of patients with established HIV infection.

Measuring fatigue in people living with HIV/AIDS: psychometric characteristics of the HIV-related fatigue scale

In the era of life-prolonging antiretroviral therapy, chronic fatigue is one of the most prevalent and disabling symptoms of people living with HIV/AIDS, yet its measurement remains challenging. No instruments have been developed specifically to describe HIV-related fatigue. We assessed the reliability and construct validity of the HIV-Related Fatigue Scale (HRFS), a 56-item self-report instrument developed through formative qualitative research and designed to measure the intensity and consequences of fatigue as well as the circumstances surrounding fatigue in people living with HIV. The HRFS has three main scales, which measure fatigue intensity, the responsiveness of fatigue to circumstances and fatigue-related impairment of functioning. The functioning scale can be further divided into subscales measuring impairment of activities of daily living, impairment of mental functioning and impairment of social functioning. Each scale demonstrated high internal consistency (Cronbach's alpha=0.93, 0.91 and 0.97 for the intensity, responsiveness and functioning scales, respectively). The HRFS scales also demonstrated satisfactory convergent validity when compared to other fatigue measures. HIV-Related Fatigue Scales were moderately correlated with quality of nighttime sleep (rho=0.46, 0.47 and 0.35) but showed only weak correlations with daytime sleepiness (rho=0.20, 0.33 and 0.18). The scales were also moderately correlated with general mental and physical health as measured by the SF-36 Health Survey (rho ranged from 0.30 to 0.68 across the 8 SF-36 subscales with most >0.40). The HRFS is a promising tool to help facilitate research on the prevalence, etiology and consequences of fatigue in people living with HIV.