Personnel physical activity levels on naval vessels (HPAS 2010)
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HPAS 2010Human Performance at Sea
Personnel physical activity levels on naval vessels
Evidence for soporific and fatigue effects?
LCDR P. Matsangas, HNLT J. Johnston, USN
M.E. McCauleyN.L. Miller
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HPAS 2010Human Performance at Sea
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Human Performance at Sea Introduction Johnston (2009)
Time underway process Motion induced fatigue (?) Sopite syndrome (?)
Actigraphy
Scope Ship’s motion vs personnel physical activity under
provoking motions
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Human Performance at Sea Methodology I Retrospective analysis
HSV-2 SWIFT FSF-1 Sea Fighter
Activity assessment tools Wrist activity monitors (WAMs) -
actiwatches Sleep diaries
Motion detection Wave height measuring system
(FSF-1) WAM (HSV-2)
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Human Performance at Sea Methodology II
Parameter
Description
i Day underway
J Participant
Activity(1,j)
mean activity of participant j during day 1
Activity(i,j)
Mean daily activity level of participant j during underway day I
Activity%(i,j)
Mean daily percentage-wise activity level of participant j during underway day I
n Number of participants
Activity%(i)
Mean daily activity level during underway day I
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(1) (2)
Physical activity issues
Inter-subject variability
Baseline value
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Human Performance at Sea
Data setsHSV-2
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Main characteristics Missions: ASW-SUW-
MIW Length: 319 ft Full Load: 1800 tn Speed: >40 kts Core Crew: 40 Mission modules crew:
25 Range: 4300 nm at 30-
35 kts
Participants (Crew): 19 Male: Eighteen (95%) Female: One (5%)
Data collection period 10th – 23rd May 2004 Transatlantic transiting from
Norway to Norfolk Sea State
Mid state 4 to state 5
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Human Performance at Sea
Data setsFSF-1
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Main characteristics Missions: ASW-SUW-
MIW Length: 262 ft Full load: 1670 tn Speed: 50 kts Crew: 26 Range: 4400 nm
Participants : 24 Civilians Military Contracted crew members
Data collection period 14th – 20th March 2007 Transiting from San Diego
to Panama Canal Zone Sea State
3 to 5
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Human Performance at Sea
ResultsHSV-2 Swift
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0.000.25
0.500.751.00
1.25
Mea
n da
ily a
ctiv
ity [%
]
02
468
10
SW
H (
ft)
01
234
5
Sea
Sta
te
010
203040
50
SM
A-3
0
05/1
1/20
04
05/1
2/20
04
05/1
3/20
04
05/1
4/20
04
05/1
5/20
04
05/1
6/20
04
05/1
7/20
04
05/1
8/20
04
05/1
9/20
04
05/2
0/20
04
05/2
1/20
04
05/2
2/20
04
Date
Activity and motion vs time on HSV-2 SWIFT
Mean daily activity level vs induced motion
% = 1.24 - 0.08*Log SMA-30Activity
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Human Performance at Sea
ResultsFSF-1 Sea Fighter
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0.0
0.20.4
0.60.8
1.0
Mea
n da
ily a
ctiv
ity [%
]
0
2
4
6
8
SW
H (
ft)
0
12
34
5
Sea
Sta
te
03/1
4/20
07
03/1
5/20
07
03/1
6/20
07
03/1
7/20
07
03/1
8/20
07
03/1
9/20
07
03/2
0/20
07
Date
Activity and motion vs time on FSF-1
0.7
0.75
0.8
0.85
0.9
0.95
1
1.05
Mean d
aily
activ
ity [%
]
4 4.5 5 5.5 6 6.5 7 7.5 8 8.5
SWH (ft)
Mean daily activity level vs induced motion
% = 1.33 - 0.26*Log SWHActivity
0.15
0.2
0.25
0.3
0.35
Sta
ndar
d D
evia
tion
of
daily
act
ivity
[%]
4 4.5 5 5.5 6 6.5 7 7.5 8 8.5
SWH (ft)
Standard deviation of daily activity level vs induced motion
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Human Performance at Sea Discussion
Factors HSV-2 [a] FSF-1 [b] FSF-1 [c]
Sleep deprivation NA
Motion induced fatigue
Motion sickness/ Sopite syndrome
Biodynamic interference
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Factors probably involved in personnel decreased activity (a tickmark denotes a possible effect)
WAMs to measure motion
StressorsOccupational
Assigned duties and activities, timing of tasks, etc
Non-occupationalEnvironmentalPsychological
Systematic trends (identified)TimeMotion
[a] McCauley, M. E., Matsangas, P., & Miller, N. L. (2005). Motion and fatigue study in High Speed Vessel operations: Phase 1 report. Monterey, CA: Naval Postgraduate School.[b] McCauley, M. E., Pierce, E. C., Matsangas, P., Price, B., LaBreque, J., & Blankenship, J. (2007). Vessel Motion Effects on Human Performance aboard the FSF-1 Sea Fighter (Technical Report). Monterey, California, USA: Naval Postgraduate School and NSWC PC[c] Johnston, J. M. (2009). An Activity-Based Non-Linear Regression Model of Sopite Syndrome and its Effects on Crew Performance in High-Speed Vessel Operations. Naval Postgraduate School, Monterey, CA.
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Human Performance at Sea Conclusions Physical activity decrement
Time (days underway) (Johnston (2009)
Motion (provoking)
Future work More data – More analysis Verify time / motion processes
Increase external validity Identify
Other factors/processes Interactions
Develop model Understand what we found!!!
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36% - 41%