title: Maximal oxygen uptake during exercise using trained or untrained muscles.
abstract: Maximal oxygen uptake, VO2 max, was determined for cyclists, long-distance runners and non-athletes during uphill running (treadmill) and cycling (cycloergometer) to compare trained and untrained muscles. Blood lactate, maximal heart rate and maximal ventilation during work were also measured. VO2 max was higher for runners and non-athletes during exercise on the treadmill and higher for cyclists during exercise on the cycloergometer. For runners and non-athletes, maximal heart rate accompanied the increase in VO2 max, whereas similar values were obtained for cyclists on both ergometers. Maximal ventilation during work accompanied the difference in VO2 max in both groups of athletes but among non-athletes it was similar during exercise on both the cycloergometer and the treadmill. Blood lactate was similar during exercise on both ergometers for all groups. These results suggest that the quantitative effects of training on cardiovascular and respiratory functions may only be properly evaluated by using an ergometer which requires an activity similar to that usually performed by the subjects. Cycle riding may possibly induce significant and specific alterations in the muscles involved in the exercise, thus increasing peripheral O2 uptake even after stabilization of maximal cardiac output, whereas running may well induce an improvement of all factors which are responsible for aerobic work power.
mesh_terms: D001642:Bicycling; D005080:Exercise Test; D006339:Heart Rate; D006801:Humans; D007773:Lactates / Q000097:blood; D008451:Maximal Voluntary Ventilation; D009132:Muscles / Q000502:physiology*; D010101:Oxygen Consumption; D010806:Physical Education and Training; D005082:Physical Exertion; D012420:Running
chemical_list: D007773:Lactates