RATIONALE: Drugs used in chemotherapy, such as carboplatin and vinorelbine, work in different ways to stop the growth of tumor cells, either by killing the cells or by stopping them from dividing. Chemotherapy can lead to a loss of leg muscle strength. Neuromuscular electrical stimulation may improve muscle strength and quality of life. It is not yet known whether chemotherapy given together with neuromuscular electrical stimulation is more effective than chemotherapy alone in treating patients with non-small cell lung cancer.