The effects of prior incremental cycle exercise on the physiological responses during incremental running to exhaustion: relevance for sprint triathlon performance

It is common for the physiological working capacity of a triathlete when cycling and running to be assessed on two separate days. The aim of this study was to establish whether an incremental running test to exhaustion has a negative effect after a 5 h recovery from an incremental cycling test. Eight moderately trained triathletes (age, 26.2 +/- 3.4 years; body mass, 67.3 +/- 9.1 kg; VO2max when cycling, 59 +/- 13 ml x kg x min(-1); mean +/- s) completed an incremental running test 5 h after an incremental cycling test (fatigue) as well as an incremental running test without previous activity (control). Maximum running speed, maximal oxygen uptake (VO2max) and the lactate threshold were determined for each incremental running test and correlated with the average speed during a 5 km run, which was performed immediately after a 20 km cycling time-trial, as in a sprint triathlon. There were no significant differences in maximum running speed, VO2max or the lactate threshold in either incremental running test (control or fatigue). Furthermore, good agreement was found for each physiological variable in both the control and fatigue tests. For the fatigue test, there were significant correlations between the average speed during a 5 km run and both VO2max expressed in absolute terms (r = 0.83) and the lactate threshold (r = 0.88). However, maximum running speed correlated most strongly with the average speed during a 5 km run (r = 0.96). The results of this study indicate that, under controlled conditions, an incremental running test can be performed successfully 5 h after an incremental cycling test to exhaustion. Also, the maximum running speed achieved during an incremental running test is the variable that correlates most strongly with the average running speed during a 5 km run after a 20 km cycling time-trial in well-trained triathletes.     

To reopen the American mind

This essay originally appeared in the July 8, 1988 issue ofThe Wall Street Journal. It is reprinted here with theJournal's permission.     

Dystopia on the Health Superhighway

The emerging Information Superhighway is starting to induce visions of dystopia within the medical profession. In several countries, doctors have opposed plans for the establishment of national health data networks. In the most recent example, the Council of the British Medical Association threatened to boycott the government's national data strategy. This action followed the lead of Australian doctors, many of whom have consistently opposed a national wide-area network for health data. In common is the fear that this data linkage will erode medical independence, increase the power of government health authorities, and eliminate the confidentiality of medical information. Doctors have a duty of care to patients to protect confidentiality, and they say the emerging national networks compromise this responsibility. Here, I argue that the emerging health superhighways should either conform to strict privacy standards or they should be demolished.