Highlighting the often-overlooked health risks of prolonged sitting, Dr Rema Malik, a vascular surgeon and health educator based in Houston, Texas, recently shared what she calls a “sedentary survival guide” for people whose jobs require them to stay seated for most of the day. In an Instagram video addressed to people who spend hours glued to their chairs, she warns, “To every programmer, truck driver, and office hero in Houston who is currently glued to a chair… this is your Monday morning wake-up call.”
Speaking from her clinical experience, she adds, “As a vascular surgeon, I need you to understand one thing: Your chair is a vascular hazard.” Her message draws attention to how extended sitting quietly affects blood flow and vein health.
Dr Malik explains what happens inside the body when movement is limited for long stretches. “When you sit for 8, 10, or 12 hours a day, you are actively shutting down your body’s most important pump: the ‘Second Heart’ in your calf muscles,” she says.
Without this pump working efficiently, “blood fights gravity, pools in your lower legs, and creates a stagnant environment where blood clots (DVT) love to form.” To counter this, she outlines simple, practical steps, introduces her “Sedentary Survival Guide,” and urges viewers to save it.
Her advice includes the “1-Hour Reset” Rule, reminding people that “Gravity wins every time you sit still,” and stressing that “60 seconds of movement buys you an hour of safety.” She also recommends an “Under-Desk” Workout—“Perform 30 rapid ankle flexes (toes up, toes down) every 30 minutes”—and what she calls the “Fluid Shield,” explaining, “Thick, dehydrated blood clots faster.” According to her, these habits “create a ‘safety buffer’ for your veins,” adding that “This is critical for everyone, but the stakes get much higher after age 35.”
Link between prolonged sitting and conditions like deep vein thrombosis
Dr CM Nagesh, Honorary Secretary of the Indian College of Cardiology and Founder of Cardea Super Speciality Hospital, tells indianexpress.com, “The link is real and increasingly well documented. Prolonged, uninterrupted sitting slows venous blood flow in the legs, leading to pooling and increased clotting tendency. While deep vein thrombosis is still relatively uncommon in young, healthy adults, the risk rises significantly with long sitting hours, especially when combined with dehydration, obesity, smoking, hormonal therapy, or long-distance travel.”
He adds, “What is concerning is that sedentary work has become a daily exposure rather than an occasional one, making cumulative risk more relevant even in people without traditional cardiovascular disease.”
Short movement breaks and ankle exercises to offset long hours of sitting.
Dr Nagesh mentions that short movement breaks and ankle exercises “are essential and highly effective as a first line of prevention.” He adds, “Standing up every 30 to 45 minutes, walking for a few minutes, and performing calf and ankle movements help activate the muscle pump that pushes blood back to the heart. However, they are not a complete substitute for structured physical activity.”
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Daily habits that people with sedentary jobs can adopt
Posture and ergonomics play a larger role than many people realise. Dr Nagesh states, “Sitting with feet flat on the floor, avoiding leg crossing for long periods, and using chairs that support proper hip and knee alignment can improve venous return.”
He continues, “Maintaining a healthy body weight, limiting salt-heavy processed foods, and ensuring adequate dietary fibre also support vascular health indirectly by reducing inflammation and metabolic strain. Avoiding smoking is critical, as tobacco damages blood vessels and increases the risk of clotting. For people with prolonged sitting hours or early venous symptoms, wearing medically recommended compression stockings during the day can also be beneficial after consulting a doctor.”
DISCLAIMER: This article is based on information from the public domain and/or the experts we spoke to. Always consult your health practitioner before starting any routine.
