Why long drives are harder on your body than you think
Nicola Tik
Most people expect to feel a little stiff after a long drive. What is less well understood is why that happens, and why driving is actually one of the more physically demanding things you can do without appearing to do very much at all. This article explains what is going on in your body during a long drive.
Driving feels passive. You are sitting down, you are not exerting yourself, and yet by the end of a long journey your body can feel as though it has been working hard. That is because it has. Maintaining any sustained static position requires continuous muscular effort, and the driving position is one that the body was not designed to hold for hours at a time.
Your muscles are not switching off during a drive. They are constantly making small adjustments to keep you upright, stable, and in control of the vehicle. Over a long journey, this low level but continuous muscular effort accumulates in a way that rest simply does not allow for.
When you sit, the natural curves of the spine change. The lower back tends to flatten or round slightly, and the pressure on the discs between the vertebrae increases compared to standing. Research suggests that sustained sitting increases the load through the lumbar discs considerably compared to upright standing, and driving adds to this further through the effect of whole body vibration.
The muscles supporting the spine, particularly those deep postural muscles that work continuously to maintain spinal position, fatigue over time in a sustained static posture. As they fatigue, other structures including the discs, ligaments, and joints take on more of the load.
Road vibration is one of the factors that makes driving distinctly harder on the body than other forms of sitting. The low frequency vibration transmitted through the seat and into the spine during driving has been consistently associated with increased spinal load and discomfort in research into occupational health.
This vibration is largely imperceptible during the drive itself, which is part of why its effect on the body tends to be underestimated. It does not feel like anything is happening, but the cumulative effect over a long journey is real.
Sustained sitting reduces blood flow to the muscles of the lower body. The muscles of the legs and hips, which are largely inactive during driving, receive less circulation than they would during even gentle movement. This contributes to the heavy, stiff feeling in the legs and hips that many people notice after a long drive, and is also the reason why taking regular breaks to walk is more useful than simply stopping and sitting in a different seat.
While the lower body is largely static, the upper body is working throughout the drive. Your arms manage the steering wheel, your neck holds your head steady and makes constant small adjustments to keep your eyes on the road, and your shoulders maintain a sustained low level of activation throughout. Over a long drive, this continuous effort through the neck, shoulders, and upper back is a significant contributor to the tension many people feel in these areas after driving.
Grip tension through the hands and forearms travels upward through the arms into the shoulders and neck. A lighter hold on the wheel, where possible, reduces this chain of tension considerably.
Taking a break every 45 to 60 minutes is not just a comfort measure. It interrupts each of the processes described above. Walking briefly restores circulation to the lower body, relieves the sustained postural load on the spine, gives the deep spinal muscles a chance to recover, and allows the neck and shoulders to move through a fuller range than driving permits.
Even five minutes of gentle walking at a service station does more for the body than 20 minutes of sitting with the seat reclined.