Validity of Estimated Results from a Wearable Device for the Tests Time Up and Go and Sit to Stand in Young Adults and in People with Chronic Diseases
Abstract
:1. Introduction
2. Materials and Methods
2.1. Participants Selection
2.2. Instrumentation
2.2.1. IMU-Based Custom Device Description
2.2.2. The Algorithms
STS Algorithm
TUG Algorithm
2.3. Physical Fitness Tests
2.3.1. Sit to Stand Test
2.3.2. Timed “Up and Go” Test
2.4. Test Protocol and Data Processing
- A.
- Warm-up session with stretching, joint mobilization and muscle strengthening exercises.
- B.
- Installation of the custom device placed on the left wrist of the participant during all tests. The Installation of the sensor required a maximum of 3 min. Prior to use by each participant the device was automatically initialized via the supporting software (USB, prototype). To perform a test, the investigator had to choose the test from the menu, press the “start” button and 3 s later the device vibrated and the participant could start the test, see Figure 1, Figure 2 and Figure 3.
- C.
- Prior to each test, the participant performed a trial run to ensure that they understood the instructions (this step may take about 2 min). The participants performed STS and TUG tests, the results were also measured by the examiner using visual counts for STS and a stop-watch for TUG. The activity mode was automatically disabled at the end of each test. The data collection is carried out during all the tests which is supposed to take no more than 2 times 30 s, so less than 1 min. With the given acquisition frequency of 50 Hz, this corresponds to 3000 measurements. Each measurement corresponds to 9 values issued from the 9-axis accelerometer. With the 12 bits-ADC of the device, a 1-min recording corresponds to less than 40 kbytes.
- D.
- Download of the data from the device: Data from the sensor was downloaded via a universal serial bus (USB) and then processed. The members of the research team used a laptop to configure the device, start a test, and read the outcomes at the end of each test. The testing procedure is illustrated in Figure 4.
2.5. Statistical Analysis
3. Results
3.1. Population Characteristics
3.2. Validity Parameters
4. Discussion
4.1. Accuracy
4.2. Limitations
4.3. Strengths of the Study
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Characteristics | Value |
---|---|
IMU 9-axis sensor | ICM20948 |
Microcontroller processing unit | STM32WB55RG |
On chip memory (program + data) | 1 Mbyte |
DAC resolution | 12 bits |
Sampling frequency | 50 Hz |
Connectivity | BLE and USB |
Power | Lithium ion battery 560 mAh 3.7 V |
Characteristic | Healthy Adults, n = 31 | Chronic Disease, n = 14 |
---|---|---|
Sex | ||
Female | 15 (48%) | 9 (64%) |
Male | 16 (52%) | 5 (36%) |
Weight (Kg) | 70.0 [12] | 82.0 [10] |
Height (m) | 1.7 ± 0.1 | 1.6 ± 0.1 |
STS observed (n) | 18.9 ± 4.5 | 14.1 ± 4.0 |
STS sensor (n) | 18.7 ± 3.8 | 14.2 ± 3.0 |
TUG observed (s) | 5.9 ± 0.8 | 6.7 ± 3.1 |
TUG Sensor (s) | 5.5 ± 1.2 | 7.0 ± 3.4 |
Measures | r | p-Value | ICC | 95% CI | p-Value | |
---|---|---|---|---|---|---|
STS group A | 0.96 | <0.001 | 0.95 | 0.9, 0.97 | <0.001 | |
STS group B | 0.94 | <0.001 | 0.90 | 0.74, 0.97 | <0.001 | |
TUG group A | 0.80 | <0.001 | 0.75 | 0.43, 0.79 | <0.001 | |
TUG group B | 0.87 | <0.001 | 0.98 | 0.91, 0.99 | <0.001 |
Measures | Mean Bias | Percentage Difference (%) | 95% LoA Down | 95% LoA Up | RMSE | Percentage RMSE (%) |
---|---|---|---|---|---|---|
STS group A | 0.19 | 0.08 | −2.5 | 2.89 | 1.37 | 7.22 |
STS group B | −0.14 | −3.21 | −3.23 | 2.94 | 1.52 | 10.83 |
TUG group A | 0.45 | 9.24 | −1.18 | 2.08 | 0.94 | 15.75 |
TUG group B | −0.36 | −4.56 | −1.66 | 0.95 | 0.74 | 11.02 |
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Agbohessou, K.G.; Sahuguede, S.; Lacroix, J.; Hamdan, F.; Conchon, E.; Dumas, Y.; Julien-Vergonjanne, A.; Mandigout, S. Validity of Estimated Results from a Wearable Device for the Tests Time Up and Go and Sit to Stand in Young Adults and in People with Chronic Diseases. Sensors 2023, 23, 5742. https://doi.org/10.3390/s23125742
Agbohessou KG, Sahuguede S, Lacroix J, Hamdan F, Conchon E, Dumas Y, Julien-Vergonjanne A, Mandigout S. Validity of Estimated Results from a Wearable Device for the Tests Time Up and Go and Sit to Stand in Young Adults and in People with Chronic Diseases. Sensors. 2023; 23(12):5742. https://doi.org/10.3390/s23125742
Chicago/Turabian StyleAgbohessou, Kokouvi Geovani, Stephanie Sahuguede, Justine Lacroix, Fadel Hamdan, Emmanuel Conchon, Yannick Dumas, Anne Julien-Vergonjanne, and Stephane Mandigout. 2023. "Validity of Estimated Results from a Wearable Device for the Tests Time Up and Go and Sit to Stand in Young Adults and in People with Chronic Diseases" Sensors 23, no. 12: 5742. https://doi.org/10.3390/s23125742