Healthy
Conditions
Keywords
military exercises, neuromuscular fatigue, physiological responses, biomechanical responses, simulated military effort, high load carriage, Healthy voluntary
Brief summary
Land military missions generally combine prolonged walking/moderate-pace-running and other physical actions such as creeping, jumping, shooting,… which are associated with the direct carrying of high to severe loads of equipment and supplies (20-30 to 50 kg) by soldiers. For an infantry section, typical intervention phases last about 20-24 h and combine variable intensity grades. Consequently, military mission characteristics are an interesting investigation field of human fatigue. Previous studies have investigated human neuromuscular alterations after prolonged normal locomotion exercises \[Millet et al., 2004, 2009\], thus the aim of this study is to characterize the neuromuscular determinants of fatigue induced by a 24-h Simulated Military Effort (SME) and a 4-h Military Road March (MM), both performed with high load carriage. Additionally, the consequences of fatigue on physiological and biomechanical parameters of locomotion will be investigated.
Interventions
OTHERmilitary equipment
Military exercise of 24 hours
Sponsors
Centre Hospitalier Universitaire de Saint Etienne
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
MALE
Age
30 Years to 45 Years
Healthy volunteers
Yes
Inclusion criteria
* to be a male * to have a VO2max \> 45ml/min/kg (mean observed value in military subjects) * to be aged from 30 to 45 * to be recently retreated from National Army * to be highly experienced in military efforts * to be trained in exercises involving load carrying * to benefit from a social security insurance
Exclusion criteria
* All subjects with recent (\< 3 month) bone, articular or muscle diseases. * All subjects presenting a clinic sign of intolerance to testing procedures, especially subjects with knee, ankle, hip or back diseases. * All subjects intolerant to muddy or wooded environment. * All subjects presenting a clinic sign of intolerance to exercise, and particularly to running or walking while carrying a load * All subjects involved at the same time in another medical research * All subjects militarily active * All subjects with cardiac or pulmonary identified and known diseases
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Central fatigue quantification based on voluntary and electrically-induced force measurement on activated muscle. | after a a military exercise of 24 hours |
| Peripheral fatigue based on electrically-induced force measurement on the same muscle in relaxed condition. | after a a military exercise of 24 hours |
Secondary
| Measure | Time frame |
|---|---|
| Muscular electrical activities, based on subject's surface EMG analysis | after a a military exercise of 24 hours |
| Heart rate frequence | after a a military exercise of 24 hours |
| Walking and running mechanics, measured by an instrumented treadmill | after a a military exercise of 24 hours |
| Oxygen uptake, carbon-dioxide output, energetic-cost of locomotion and respiratory ratio, based on subject's gas exchanges. | after a a military exercise of 24 hours |
| Rate of perceived exertion, measured by the Borg scale ranging from 6 to 20 | after a a military exercise of 24 hours |
| Perceived comfort, measured by a 10 cm visual analogic scale (VAS) | after a a military exercise of 24 hours |
| Postural equilibration, measured by a piezo-dynamometric double platform | after a a military exercise of 24 hours |
| Lactatemia, based on subject's arterialized capillary blood samples analysis | after a a military exercise of 24 hours |
Countries
France
Outcome results
None listed