Physical activity levels are related through algorithms to the energetic demand, with no information regarding the integrity of the multiple physiological systems involved in the energetic supply. Longitudinal analysis of the oxygen uptake ((V) over dotO(2)) by wearable sensors in realistic settings might permit development of a practical tool for the study of the longitudinal aerobic system dynamics (i.e., (V) over dotO(2) kinetics). This study evaluated aerobic system dynamics based on predicted (V) over dotO(2) data obtained from wearable sensors during unsupervised activities of daily living (mu ADL). Thirteen healthy men performed a laboratory-controlled moderate exercise protocol and were monitored for approximate to 6 h/day for 4 days (mu ADL data). Variables derived from hip accelerometer (ACC(HIP)), heart rate monitor, and respiratory bands during mu ADL were extracted and processed by a validated random forest regression model to predict (V) over dotO(2). The aerobic system analysis was based on the frequency-domain analysis of ACC(HIP) and predicted (V) over dotO(2) data obtained during mu ADL. Optimal samples for frequency domain analysis (constrained to <= 0.01 Hz) were selected when ACC(HIP) was higher than 0.05 g at a given frequency (i.e., participants were active). The temporal characteristics of predicted (V) over dotO(2) data during mu ADL correlated with the temporal characteristics of measured (V) over dotO(2) data during laboratory-controlled protocol (r = 0.82, P < 0.001, n = 13). In conclusion, aerobic system dynamics can be investigated during unsupervised activities of daily living by wearable sensors. Although speculative, these algorithms have the potential to be incorporated into wearable systems for early detection of changes in health status in realistic environments by detecting changes in aerobic response dynamics. NEW & NOTEWORTHY The early detection of subclinical aerobic system impairments might be indicative of impaired physiological reserves that impact the capacity for physical activity. This study is the first to use wearable sensors in unsupervised activities of daily living in combination with novel machine learning algorithms to investigate the aerobic system dynamics with the potential to contribute to models of functional health status and guide future individualized health care in the normal population.
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页码:473 / 481
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Alexander NB, 2003, J GERONTOL A-BIOL, V58, P734
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Univ Waterloo, Fac Appl Hlth Sci, Waterloo, ON, Canada
Conselho Nacl Desenvolvimento Cient & Tecnol, Brasilia, DF, Brazil
Univ Ibirapuera, Dept Fisioterapia, Sao Paulo, BrazilUniv Waterloo, Fac Appl Hlth Sci, Waterloo, ON, Canada
Beltrame, T.
Amelard, R.
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Univ Waterloo, Dept Syst Design Engn, Waterloo, ON, Canada
Schlegel Univ Waterloo, Res Inst Aging, Waterloo, ON, CanadaUniv Waterloo, Fac Appl Hlth Sci, Waterloo, ON, Canada
Amelard, R.
Wong, A.
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Univ Waterloo, Dept Syst Design Engn, Waterloo, ON, Canada
Schlegel Univ Waterloo, Res Inst Aging, Waterloo, ON, CanadaUniv Waterloo, Fac Appl Hlth Sci, Waterloo, ON, Canada
Wong, A.
Hughson, R. L.
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Univ Waterloo, Fac Appl Hlth Sci, Waterloo, ON, Canada
Schlegel Univ Waterloo, Res Inst Aging, Waterloo, ON, CanadaUniv Waterloo, Fac Appl Hlth Sci, Waterloo, ON, Canada
机构:
Univ Waterloo, Fac Appl Hlth Sci, Waterloo, ON, Canada
Conselho Nacl Desenvolvimento Cient & Tecnol, Brasilia, DF, Brazil
Univ Ibirapuera, Dept Fisioterapia, Sao Paulo, BrazilUniv Waterloo, Fac Appl Hlth Sci, Waterloo, ON, Canada
Beltrame, T.
Amelard, R.
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h-index: 0
机构:
Univ Waterloo, Dept Syst Design Engn, Waterloo, ON, Canada
Schlegel Univ Waterloo, Res Inst Aging, Waterloo, ON, CanadaUniv Waterloo, Fac Appl Hlth Sci, Waterloo, ON, Canada
Amelard, R.
Wong, A.
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机构:
Univ Waterloo, Dept Syst Design Engn, Waterloo, ON, Canada
Schlegel Univ Waterloo, Res Inst Aging, Waterloo, ON, CanadaUniv Waterloo, Fac Appl Hlth Sci, Waterloo, ON, Canada
Wong, A.
Hughson, R. L.
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h-index: 0
机构:
Univ Waterloo, Fac Appl Hlth Sci, Waterloo, ON, Canada
Schlegel Univ Waterloo, Res Inst Aging, Waterloo, ON, CanadaUniv Waterloo, Fac Appl Hlth Sci, Waterloo, ON, Canada