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Cardiorespiratory fitness evaluation by the shuttle test in asthmatic subjects during aerobic training
Ahmaidi SB, Varray AL, Savy-Pacaux AM, Prefaut CG
Chest 1993 Apr;103(4):1135-1141
clinical trial
3/10 [Eligibility criteria: No; Random allocation: Yes; Concealed allocation: No; Baseline comparability: No; Blind subjects: No; Blind therapists: No; Blind assessors: Yes; Adequate follow-up: No; Intention-to-treat analysis: No; Between-group comparisons: No; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

PURPOSE: The purpose of this study was to assess the validity of the 20-m shuttle test with 1-min stages (20-MST) to estimate maximal oxygen uptake (VO2max) and its ability to register cardiorespiratory modifications over the course of an individualized aerobic training program for mild to moderately asthmatic children acclimatized to moderate altitude. METHODS: Forty-eight asthmatic subjects aged 12 to 17 years performed both a maximal incremental exercise test on a cycle ergometer and the 20-MST. Ten of the subjects were then randomly chosen and trained three times per week at their ventilatory threshold (Vth) intensity level for three months. Another group of ten asthmatic subjects served as control subjects. Training intensity was adjusted monthly; heart rate values at Vth were increased by the same proportion as the increase in VO2max as measured by the 20-MST. At the end of training, both groups were again evaluated with the two tests. The VO2max values by direct measurement and by the 20-MST were not significantly different for the entire population (46.5 +/- 1.6 versus 47.2 +/- 2.1 ml/min/kg). In addition, the two test results were in close agreement (r = 0.84; p < 0.01). After training, a sharp improvement in the direct VO2max (44.1 +/- 2.4 to 51.2 +/- 1.9 ml/min/kg) was noted in the training group as well as an increase in the Vth (25.6 +/- 1.9 to 32.1 +/- 3.4 ml/min/kg), the maximal power (152 +/- 7.1 to 185 +/- 3.8 W), and the maximal oxygen pulse (0.24 +/- 0.007 to 0.27 +/- 0.008 ml/beat/kg). CONCLUSION: The indirect measure confirmed these results: a simultaneous increase in VO2max (43.7 +/- 2.5 to 53.8 +/- 2.1 ml/min/kg), maximal oxygen pulse (0.22 +/- 0.004 to 0.27 +/- 0.006 ml/beat/kg), and the number of stages completed (7 +/- 1.4 to 10.1 +/- 1.3) was observed. It was concluded that the 20-MST has sufficient validity to assess VO2max and to register cardiorespiratory modifications over the course of individualized aerobic training programs in mild and moderately asthmatic children. It thus may be used to adjust training intensities during these programs.

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