Table 1.

Search strategy and initial results.

Database	Population	Target variable	Outcome	Results
Pubmed	((“Military Personnel” [Mesh] OR “Emergency Responders”[Mesh] OR “Police” [All Fields] OR “firefighters” [All Fields] OR “Sheriff” [All Fields] OR “Patrol Officer” [All Fields] OR “Law Enforcement”[All Fields] OR “tactical athlete” [All Fields] OR “cadet” [All Fields] OR “agent”[All Fields] OR “recruit” [All Fields] OR “FBI” [All Fields] OR “officer” [All Fields]) OR defense OR defense	(“HRV”[All Fields] OR “Heart Rate Variability” [All Fields] OR “Heart Rate Interval” [All Fields] OR “RR variability” [All Fields] OR “cycle length variability” [All Fields] OR “heart period variability” [All Fields] OR “autonomic function” [All Fields] OR “vagal control” [All Fields]))	Exercise “[All Fields]” OR Physical Exertion “[All Fields] OR Physical Fitness “[All Fields]” OR BMI “[All Fields]” OR Body Mass Index “[All Fields]” OR Body Constitution “[All Fields]” OR Stress “[All Fields]” OR Work Performance “[All Fields]” OR endurance [All Fields] OR fitness [All Fields] OR strength[All Fields] OR (“cumulative trauma disorders” [MeSH Terms] OR (“cumulative” [All Fields] AND “trauma” [All Fields] AND “disorders” [All Fields]) OR “cumulative trauma disorders” [All Fields] OR (“overuse” [All Fields] AND “injury” [All Fields]) OR “overuse injury” [All Fields]) OR ((“Stress” [Journal] OR “stress” [All Fields]) AND (“wounds and injuries” [MeSH Terms] OR (“wounds” [All Fields] AND “injuries” [All Fields]) OR “wounds and injuries” [All Fields] OR “injury” [All Fields])) OR recovery [All Fields] OR (“fatigue” [MeSH Terms] OR “fatigue” [All Fields]) OR readiness [All Fields] OR resilience[All Fields] OR overtraining[All Fields] OR hardiness [All Fields] OR exhaustion[All Fields])	195
CINAHL	(MH “Military Personnel”) OR (MH “Emergency Medical Technicians”) OR (MH “Police”) OR (MH “Firefighters”) OR “Military Personnel” OR Police OR “Emergency Responder” OR “Firefighter” “Sheriff” OR “Patrol Officer” OR “Law Enforcement” OR “tactical athlete” OR “cadet” OR “agent” OR “recruit” OR “FBI” OR “officer” OR defense OR defense	“HRV” OR (MH “Heart Rate Variability”) OR “Heart Rate Interval” OR “RR variability” OR “cycle length variability” OR “heart period variability” OR “autonomic function” OR “vagal control”	(MH “Exercise”) OR (MH “Body Mass Index”) OR (MH “Hardiness”) OR (MH “Athletic Performance”) OR (MH “Job Performance”) OR (MH “Physical Performance”) OR (MH “Physical Fitness”) OR (MH “Fatigue”) OR (MH “Mental Fatigue”) OR (MH “Muscle Fatigue”) OR (MH “Recovery”) OR (MH “Recovery, Exercise”) OR (MH “Stress”) OR (MH “Stress Disorders, Post-traumatic”) OR (MH “Stress, Occupational”) OR (MH “Stress, Physiological”) OR (MH “Fractures, Stress”) OR (MH “Stress, Psychological”) OR (MH “Overtraining Syndrome”) OR strength OR endurance OR resilience OR overuse OR “work performance” OR readiness OR exhaustion	35
SPORTDiscus	“Military Personnel” OR “Emergency Responders” OR “Police” OR “firefighters” OR “Sheriff” OR “Patrol Officer” OR “Law Enforcement” OR “tactical athlete” OR “cadet” OR “agent” OR “recruit” OR “FBI” OR “officer” OR defense OR defense	“HRV” OR “Heart Rate Variability” OR “Heart Rate Interval” OR “RR variability” OR “cycle length variability” OR “heart period variability” OR “autonomic function” OR “vagal control”	Exercise OR “Physical Exertion” OR “Physical Fitness” OR “BMI” OR “Body Mass Index” OR “Body Constitution” OR “Stress” OR “Work Performance” OR endurance OR fitness OR strength OR “overuse injury” OR “stress injury” OR recovery OR fatigue OR readiness OR resilience OR overtraining	16
Embase	“Solider” /exp OR “rescue personnel” /exp OR “police” /exp OR “fire fighter” /exp “Military Personnel” OR “Emergency Responders” OR “Police” OR “firefighters” OR “Sheriff” OR “Patrol Officer” OR “Law Enforcement” OR “tactical athlete” OR “cadet” OR “FBI” OR “officer”	“HRV” OR “Heart Rate Variability” /exp OR “Heart Rate Interval” OR “RR variability” OR “cycle length variability” OR “heart period variability” OR “autonomic function” OR “vagal control”	“Exercise” /exp OR “body mass” /exp OR “body composition” /exp OR resilience OR readiness OR hardiness OR “fitness” /exp OR “stress” /exp OR “heat stress” /exp OR “job stress” /exp OR “muscle stress” /exp OR “musculoskeletal stress” /exp OR “mental stress” /exp OR “job performance” /exp OR “mental recovery” /exp OR “exercise recovery” /exp OR “fatigue” /exp OR “muscle fatigue” /exp OR “posttraumatic stress disorder” /exp OR endurance OR fitness OR strength OR fatigue OR readiness OR resilience OR overtraining	43
DTIC	“Military Personnel” OR “Emergency Responders” OR “Police” OR “firefighters” OR “Sheriff” OR “Patrol Officer” OR “Law Enforcement” OR “tactical athlete” OR “cadet” OR “agent” OR “recruit” OR “FBI” OR “officer”	“HRV” OR “Heart Rate Variability” OR “Heart Rate Interval” OR “RR variability” OR “cycle length variability” OR “heart period variability” OR “autonomic function” OR “vagal control”	Exercise” OR “Physical Exertion” OR “Physical Fitness” OR “BMI” OR “Body Mass Index” OR “Body Constitution” OR “Stress” OR “Work Performance” OR endurance OR fitness OR strength OR “overuse injury” OR “stress injury” OR recovery OR fatigue OR readiness OR resilience OR overtraining	7