Victor Forge
Human Immunodeficiency Virus (HIV) is a blood-borne virus that is transmitted via sexual intercourse, shared intravenous drug paraphernalia, and during the birth process or via human milk. HIV infection is often associated with a loss of appetite, weight loss, and muscle atrophy. Muscle atrophy, or muscle wasting, in people with HIV is significant because it has been associated with accelerated disease progression and increased morbidity. Treatments for muscle wasting in HIV-infected individuals include nutritional supplementation, cytokine reduction, hormone therapy, and resistance exercise training.
| Characteristics | Values |
|---|---|
| HIV-associated condition | Wasting syndrome |
| Wasting syndrome definition | Unwanted weight loss of more than 10% of a person's body weight, with either diarrhea or weakness and fever lasting at least 30 days |
| Weight loss | Includes loss of fat and muscle |
| Causes of wasting syndrome | HIV, inflammation, or opportunistic infections |
| HIV-associated wasting | Loss of lean tissue mass, including decreases in skeletal muscle mass |
| Cause of muscle wasting | Signalling related to circulating molecules, including tumour necrosis factor (TNF)-alpha, growth hormone, insulin-like growth factor (IGF)-1, and testosterone |
| Other causes | Nutritional status, malnutrition, and specific dietary deficiencies |
| Treatments for muscle wasting | Nutritional supplementation, cytokine reduction, hormone therapy, and resistance exercise training |
| HIV medication side effects | Diarrhea, anorexia, vomiting, abdominal pain, cramping, steatorrhoea, and GI upset |
| HIV medication effects on metabolism | Can cause changes in metabolism, leading to weight gain |
| HIV and muscle loss | Muscle loss is more common when HIV infection progresses rapidly |
| Preventing muscle loss | Regular exercise, including resistance or strength training and aerobic exercise |
| Diet | Consuming a healthy diet with sufficient protein, healthy carbs, and healthy fats is important to maintain muscle mass |
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What You'll Learn
HIV-associated wasting
The prevalence of HIV-associated wasting has been studied in the United States, with findings indicating that it remains prevalent among people with HIV. The cumulative prevalence was estimated at 8.3% over a 2.5-year period, with a higher prevalence among males compared to females. Hospitalization and Medicaid coverage were also associated with higher rates of HIV-associated wasting.
The management of HIV-associated wasting focuses on effective HIV treatment with antiretroviral medications, also known as antiretroviral therapy (ART). Maintaining a healthy diet is also crucial, and individuals with HIV may require a higher calorie and protein intake compared to the general population to prevent muscle mass loss. Resistance exercise training has also been suggested as a potential treatment to counteract muscle wasting.
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Treatments for muscle wasting
Muscle wasting is a common condition in HIV-infected individuals, and it can significantly impact their health and quality of life. The condition is characterized by a loss of lean tissue mass, including a decrease in skeletal muscle mass. Several treatments have been proposed to counteract muscle wasting in people living with HIV, and they include:
Nutritional Interventions
Nutrition plays a crucial role in managing muscle wasting. Nutritional counselling and supplementation can help increase calorie and protein intake, promoting weight gain and improving muscle health. For example, total parenteral nutrition, which provides as many calories as tolerated up to 35 kcal/kg of body weight, has been shown to increase body cell mass, body weight, and fat mass in malnourished AIDS patients. Additionally, a combined l-glutamine and antioxidant supplement administered to HIV-infected individuals with wasting resulted in increased body weight and body cell mass.
Hormone Therapy
Growth hormone therapy and testosterone therapy have been explored as treatments for HIV-associated muscle wasting. Short-term administration of growth hormone has been shown to increase body weight and protein anabolism. Testosterone therapy may also be considered to reverse muscle loss, but there are concerns about the adverse metabolic effects of long-term use.
Cytokine Treatments
Cytokine reduction is another potential treatment option for muscle wasting in HIV-infected individuals.
Resistance Exercise Training
Exercise therapy, specifically resistance exercise training, is a promising approach to counteracting muscle wasting. It is more accessible than other treatments and can help improve muscle strength and function.
Antiretroviral Therapy
While not directly a treatment for muscle wasting, appropriate antiretroviral medication is the foundation of AIDS therapy and can help manage the condition.
It is important to note that a combination of these treatments may be most effective, and each patient's needs may vary. Further research and understanding of HIV-associated muscle wasting are ongoing, and future treatments may include new drug therapies and exercise interventions.
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HIV-induced lipodystrophy
Lipodystrophy is a condition that changes the way the body makes, uses, and stores fat. It is also referred to as fat redistribution, where fat is abnormally taken from one region of the body and relocated to another. HIV-associated lipodystrophy can manifest as two distinct phenotypes: fat accumulation (lipohypertrophy) or fat loss (lipoatrophy).
Fat accumulation (lipohypertrophy) occurs in the truncal areas and manifests as abdominal obesity, mammary hypertrophy, accumulation of fat on the neck, or lipomas. Women are more likely to experience fat buildup, which can also occur in the breasts and neck. Men tend to experience fat loss (lipoatrophy), which occurs in the face, buttocks, arms, and legs.
The exact cause of HIV-induced lipodystrophy is unknown, but it is linked to HIV infection and some HIV medicines. HIV-1 virus infection results in a pro-inflammatory change in adipose tissue, which can contribute to lipodystrophy and subsequent metabolic abnormalities. It stimulates the expression of pro-inflammatory cytokines (TNF-alfa, IL-6, and IL-1beta), which induce a stress response in adipocytes, leading to physical cell damage. In addition, some HIV-related medicines could cause lipodystrophy, particularly after long-term use. Protease inhibitors (PIs) and reverse transcriptase inhibitors (NRTIs) have been shown to disrupt adipocyte function and lipid and glucose metabolism. These drugs reduce adipocyte differentiation and adiponectin's expression, secretion, and release from adipose tissue.
People with HIV-induced lipodystrophy often have other metabolic problems, including high cholesterol and insulin resistance, which can lead to diabetes. It is important to consult with a healthcare provider if experiencing lipodystrophy to determine if a change to HIV medicine is necessary. Treatment options for lipodystrophy include non-HIV medicines, dietary changes, regular exercise, liposuction, and injectable facial fillers.
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HIV medications and weight gain
Weight gain is a common side effect of antiretroviral therapy (ART). On average, people put on about 4 pounds during the first 2 years of their treatment, with most of that gain happening in the first year. Weight gain is more common in women, Black people, and those who were in poorer health before starting treatment.
The reasons for weight gain are unclear, but one possible reason is that the medications work. When a person has HIV, their body constantly burns calories fighting infections, and ART stops them from getting infections. In the early years after highly effective antiretroviral treatment became available (1996-2006), fat loss from the limbs and fat gain in the abdomen were common among people taking antiretroviral treatment. These changes in body fat were known as the lipodystrophy syndrome. Fat loss was associated with treatment with the nucleoside reverse transcriptase inhibitors (NRTIs) stavudine and zidovudine. Fat gain in the abdomen was associated with treatment with a drug from the protease inhibitor class, especially indinavir, nelfinavir, or ritonavir. Newer NRTIs and protease inhibitors have not been associated with these body fat changes, and lipodystrophy syndrome is rare nowadays in people starting treatment.
Protease inhibitors like atazanavir (Reyataz), darunavir (Prezista), and tipranavir (Aptivus) may cause weight gain. A newer group of HIV medications called integrase strand transfer inhibitors (INSTIs) are the ones most likely to make you gain weight. These drugs include tenofovir alafenamide, which has been associated with weight gain, especially when combined with an integrase inhibitor. In one study, people who took tenofovir alafenamide for 2 years gained an average of 9 pounds. Those who took Ziagen gained an average of 7 pounds. However, people who took Retrovir gained less than 1 pound over the same amount of time.
If you are experiencing weight gain from your HIV medication, it is important to talk to your doctor. They may be able to switch you to a medicine that is less likely to cause weight gain. Diet and exercise can help you stay at a healthy weight and avoid complications linked to being overweight.
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Exercise and muscle-building
HIV-infected persons often experience a loss of lean tissue mass, which includes decreases in skeletal muscle mass. This condition is known as HIV-associated wasting and is significant because it has been linked to accelerated disease progression and increased morbidity. To counteract muscle wasting, treatments such as nutritional supplementation, cytokine reduction, hormone therapy, and resistance exercise training have been suggested.
Types of Exercise for Muscle Building
Strength training is the most effective type of exercise for building muscle. This includes exercises such as lifting weights, using weight machines, or performing bodyweight exercises like push-ups and pull-ups. Free weights, such as dumbbells, kettlebells, and barbells, are often superior to machines for muscle building, as they allow for a greater range of motion and recruit more muscle fibres. However, machines can be useful for those with balancing issues or other limitations. Compound exercises that work multiple muscle groups at once, such as squats, deadlifts, and lunges, are excellent for building leg muscles. Cardiovascular exercise, also known as aerobic or cardio activity, is also important for overall health and can support muscle growth and function.
Exercise Technique and Safety
It is crucial to use proper form and technique when performing strength exercises to reduce the risk of injury and enhance muscle building. Warm-up and stretching before exercise are important, and it is generally recommended to start with lighter weights and gradually increase the weight or resistance level. Breathing techniques and controlled movements are also essential. It is normal to experience some soreness and muscle fatigue, especially when starting a new routine, but excessive discomfort or exhaustion indicates that the workouts may be too intense or frequent. It is important to listen to your body and adjust the intensity or frequency if needed.
Rest and Recovery
Allowing for adequate rest and recovery is integral to muscle building. Muscle groups need time to repair and regenerate between workouts, and insufficient rest can slow progress and increase the risk of injury. It is generally recommended to allow at least 48 hours between strength training sessions for the same muscle groups. Breaking workouts into upper body and lower body days can be a useful strategy.
Individual Factors
It is important to remember that people build muscle at different rates, and factors such as age, sex, and genetics play a role. For example, men tend to experience a natural decline in muscle mass and testosterone levels after age 30, making it harder to build and maintain muscle over time. As such, workout routines should be tailored to the individual, taking into account any specific considerations or limitations. It is always advisable to consult with a healthcare professional or fitness trainer before starting a new exercise regimen, especially if you have underlying health conditions or concerns about injury.
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Frequently asked questions
Yes, HIV-infected persons often experience a loss of lean tissue mass, which includes decreases in skeletal muscle mass. This condition is known as HIV-associated wasting or muscle wasting syndrome.
Muscle atrophy in people with HIV can be caused by several factors, including malnutrition and specific dietary deficiencies, elevated resting energy expenditure (REE), and alterations in growth hormone release and utilisation.
HIV-induced lipodystrophy and nutrient malabsorption can cause significant alterations in growth hormone and IGF-1 (insulin-like growth factor-1) function, which are important for muscle growth and repair. This leads to a decrease in lean tissue mass and muscle atrophy.
People with HIV may experience unwanted weight loss, decreased muscle mass, and muscle weakness. They may also have sensory impairments that affect taste and appetite, leading to reduced hunger and malnutrition.
Treatment of muscle atrophy in people with HIV may include nutritional supplementation, cytokine reduction, hormone therapy, and resistance exercise training. Eating a healthy diet with adequate protein, healthy carbs, and healthy fats is also important to fuel muscle growth and maintain a healthy weight.
