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Reliability and Functional Associations of VentriJect Seismofit® VO2 Estimates
Journal article

Reliability and Functional Associations of VentriJect Seismofit® VO2 Estimates

Luke Del Vecchio and Mike Climstein
Journal of clinical exercise physiology, Vol.First online
22/07/2026
DOI: https://doi.org/10.31189/CEPH-25-00038
Appears in  Recent Faculty of Health Publications

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Abstract

Introduction: Cardiorespiratory fitness is a key determinant of morbidity, mortality, and functional independence in older adults. Direct measurement of maximal oxygen consumption (VO2max) through cardiopulmonary exercise testing (CPET) is resource intensive and often inacc in community-based exercise physiology practice. Emerging nonexercise technologies such as the VentriJect Seismofit® (VS) offer a practical alternative, yet evidence of its accuracy and reliability in older adults and walking modalities is limited. Methods: Thirty community-dwelling adults (53–69 years) completed the Adult Pre-Exercise Screening System questionnaire and underwent a submaximal graded treadmill test (Bruce protocol; terminated at 85% age-predicted maximal heart rate or rating of perceived exertion of 15). VO2max was estimated using the VS device in duplicate for reliability. Predicted VO2max was compared against treadmill-derived metabolic equivalents (METs) using Pearson correlation and linear regression. Results: VS-estimated VO2max was significantly correlated with Bruce treadmill performance (r = 0.45, P = .012), explaining 20% of the variance. The regression slope indicated a 0.21 MET increase per 1 mL·kg−1·min−1 VO2max. Participants were distributed across stages 2–4 METs, linking to activities of daily living from brisk walking to jogging. Test-retest reliability of VS estimates was excellent (r = 0.98). Conclusions: VS-derived VO2max estimates show promise as a practical tool for predicting functional capacity in middle-aged and older adults. With further validation, non-exercise assessment may enable exercise physiologists to streamline functional evaluation and tailor activity counselling in settings with limited access to CPET.

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