Key result
High altitude is linked to a ~56% reduction in ESWT duration versus sea level.
Why the study?
It remained unclear whether the Incremental Shuttle Walk Test and the Endurance Shuttle Walk Test have similar sensitivity in assessing exercise capacity at high altitude.
Is the Endurance Shuttle Walk Test more sensitive than the Incremental Shuttle Walk Test in detecting altitude-induced reductions in exercise capacity in healthy lowlanders?
Observational (n=8)
Is the Endurance Shuttle Walk Test more sensitive than the Incremental Shuttle Walk Test in detecting altitude-induced reductions in exercise capacity in healthy lowlanders?
The Endurance Shuttle Walk Test is more sensitive than the Incremental Shuttle Walk Test for detecting reductions in exercise capacity induced by high altitude hypoxia.
Questions ISWT sensitivity for high-altitude effects in healthy lowlanders; leaves open optimal shuttle-test selection.
Background Exercise performance at high altitude is usually impaired compared with sea level. It remains unclear whether the Incremental Shuttle Walk Test (ISWT) and the Endurance Shuttle Walk Test (ESWT) have similar sensitivity in assessing exercise capacity at high altitude. Methods Eight healthy lowlanders completed both the ISWT and ESWT at sea level and again at very high altitude within one week. Participants ascended from sea level (<500 m) to Naqu (altitude 4,505 m, Tibet) within 6 hours. Physiological indices, including peripheral oxygen saturation (SpO2), heart rate, ventilation, and perceived exertion, were measured at the end of each test. Results ISWT performance did not differ significantly between sea level and high altitude (821.4 ± 43.8 m vs. 812.5 ± 54.9 m, p > 0.05). In contrast, ESWT duration was markedly reduced at very high altitude (1,686.1 ± 1,033.0 s vs. 734.5 ± 314.0 s, p < 0.001). Heart rate, respiratory rate, minute ventilation, SpO2, dyspnea score, and leg fatigue score at the end of ESWT were similar to those observed at the end of ISWT at very high altitude. Conclusion The ESWT is more sensitive than the ISWT in detecting altitude-induced reductions in exercise capacity. The minimal difference in ISWT performance between sea level and high altitude may be explained by hyperventilatory compensation for hypoxia and by the short test duration, which limits the development of metabolic fatigue.
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Liang et al. (2026) conducted an observational in Healthy lowlanders (n=8). High altitude exposure (4,505 m) vs. Sea level (<500 m) was evaluated on Endurance Shuttle Walk Test (ESWT) duration in seconds (p=<0.001). The Endurance Shuttle Walk Test detected altitude-induced reductions in exercise capacity, with duration falling from 1686.1s at sea level to 734.5s at high altitude (p<0.001).
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