Spectrophon Dehydration Body Monitor Accuracy Evaluation
Phase: NA
Conditions: Dehydration
Sponsor: Tirat Carmel Mental Health Center

 
 
 
 
 
 
 
Spectrophon Dehydration Body Monitor Accuracy Study 
 
NCT03229109 
 
 
 
Authors: 
 
Gleb Zilberstein, Anatoly Kreinin, 
Dmitry Rodin, Albert Pinhasov 
 
 
1.         Kiryat Carmel Hospital, Israel 
 
2.         Ariel University, Israel 
 
3.         Spectrophon LTD, Rehovot, Israel 
 
4.         Maale HaCarmel Mental Health Center, Israel 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
-2017-
03/27/17
Protocol date: 03/27/2017, ver.: 3

 
 
 
 
1. Study protocol 
 
Healthy adults (n=200) in different age and gender groups were recruited for the study. 
Samsung Gear S2 smartwatch with Spectrophon DBM attached to the bottom of the 
smartwatch were placed on the right wrist of each participant. At the same time, Samsung Gear 
Fit2 sport band with Spectrophon DBM attached to the bottom of the band was placed on the 
left wrist of the participant. Each participant was subjected to moderate physical activity. Data 
from Samsung Gear S2 and Samsung Gear Fit2 was obtained simultaneously. In parallel, 
subject weight was also monitored using commercially available digital balancers (Shekel B- 
200-P). 
 
The evaluation of the measurement accuracy of the Spectrophon DBM was defined as the 
difference between subject weight change during the exertion (due to sweating and water 
consumption) and the volume of sweat detected by Spectrophon DBM. 
All experiments were conducted indoors under ambient temperature (18oC) and humidity (40- 
 
60%) . 
 
1.1. Experimental groups: 
 
Number of subjects: 200 Age range: 18-50+ 
 
18-25 years: 50 participants 26-35 years: 50 participants 36-45 years: 50 participants 46-50 
years: 50 participants 1.2. Inclusion criteria: 
1.         Age: older than 18, both gender. 
 
2.         Ability and willingness to sign an informed consent form for participation in the study. 
 
Exclusion criteria: 
 
1.         Presence of cardiologic or vascular disease. 
 
2.         Evidence of any other serious medical disorder. 
 
3.         Pregnancy 
 
2. Procedures: 
 
Participants were weighed prior to the experiment (no clothing after maximal drying) and then 
subjected to physical activity (walking on the treadmill). 
2.1. Activity protocol:

 
 
 
 
T0: Initiate exercise 
 
T1: T0+15 min - Stop exercise, Rest T2: T0+25 min - Initiate exercise 
 
T3: T0+40 min – Stop exercise, Rest T4: T0+50 min - Initiate exercise T5: T0+65 min – Stop 
exercise 
T6: T0+75 min - Initiate exercise T7: T0+90 min – Stop exercise 
 
Total duration of study: 90min. 
 
2.2 Intensity of exercises: 
 
Participants could choose high or low intensity of exertion: a. High: 0:00-0:01 – preparation; 
 
0:01-0:05 – 5.5km/h; 
 
0:05-0:10 – 6.0km/h; 
 
0:10-0:15 – 6.5km/h; 
 
b. Low: 0:00-0:01 – preparation; 0:01-0:05 – 5.0km/h; 
 
0:05-0:10 – 5.5km/h; 
 
0:10-0:15 – 6.0km/h; 
 
2.3 Data recording: 
 
After DBM application was activated, DBM started recording data (sweat rate and total salt in 
sweat) every 20 sec. and automatically saved results into archive on a mobile phone linked to 
Samsung Gear S2 or Samsung Gear Fit2 by Bluetooth. Manual recording of data was 
conducted during breaks (between phases T1-T2, T3-T4, T5-T6 and after T7). 
Participants were also weighed during each break (no clothing after maximal drying). 
 
2.4. Drinking 
 
During the procedure, subjects could drink up to 500 ml of water. The weight of the bottle was 
measured and recorded after drinking during breaks. The difference was subtracted to the 
weight loss calculation. 
2.5 Restrictions: 
 
In this experiment, we avoided: 
 
1.         Urination during test (empty before T0) 
 
2.         Weight loss should not exceed 2% 
 
Participants could cancel the experiment at any point of the procedure if desired.

 
 
 
 
3. Statistical analysis 
 
Data obtained from Spectrophone DBM will be compared to the subject’s total weight loss for 
 
every participant. The measurement error distribution will be estimated. 
 
 
 
 
Principal investigator 
 
Prof. Anatoly Kreinin 
 
 
 
 
Signature