41.   The instrument monitored heart rate, blood oxygen levels, body position and recorded snoring.

42.   The new research suggests that when tissue oxygen levels are low, hemoglobin causes arteries in that area to open wider so more blood can rush in.

43.   The oxygen levels in a pond can be checked with monitoring kits.

44.   The oxygen levels on board at the time of the outage were sufficient to sustain the Mir crew until the Elektron oxygen generator was restarted.

45.   The new results confirm the suspicion that oxygen levels suddenly shoot up.

46.   The program is expected to be phased out in five years because new cars are built with computers that adjust carburetors to varying oxygen levels.

47.   The products have been shown to have an effect on oxygen levels in the blood even in small doses.

48.   The oxygen level in her blood was normal.

49.   The reduced oxygen level encourages the heart and lungs to increase their activity, limiting the decline in fitness.

50.   The researchers also said that in some cases, when they analyzed the contents of the products, the oxygen levels were much lower than claimed.