Bird, M

Doyle, T

Feigel, E

Forse, J

Friedl, K

Gage, C

Kargl, C

Koltun, K

Lovalekar, M

Martin, B

Nindl, B, FACSM

Steele, E

English

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         Continuous Monitorization of Physiologic Mediators of Allostasis Indicate Overuse Injury Risk in Marine Officer Candidates   Evan D. Feigel,1 Kristen J. Koltun,1 Matthew B. Bird,1 Mita Lovalekar,1 Catherine R. Gage,1 Jennifer N. Forse,1 Elizabeth J. Steele,1 Christopher K. Kargl,1 Brian J. Martin,1 Tim L.A. Doyle,2,3 Karl E. Friedl,4  Bradley C. Nindl, FACSM 1. 1 Neuromuscular Research Laboratory/Warrior Human Performance Research Center, University of Pittsburgh, Pittsburgh, PA, USA; 2 Biomechanics, Physical Performance, and Exercise (BioPPEx) Research Group, Macquarie University, Australia; 3 Faculty of Medicine, Health, and Human Sciences, Macquarie University, Australia; 4 U.S. Army Research Institute of Environmental Medicine, Natick, Massachusetts, USA.  Allostasis is the dynamic shift of physiologic mediator activity of biological responses to stress such as increased heart rate (HR), energy expenditure (EE) and altered sleep architecture (SA) that increase overuse injury risk. Overuse injuries are common in multi-stressor military training courses. Yet, mediator activity between recruits who later sustain overuse injuries (MSKI) and those who do not (noMSKI) remain unknown. PURPOSE Compare mediator activity via wearables between MSKI and noMSKI recruits during Marine Corps Officer Candidates School (OCS). METHODS 149 recruits received a wrist-worn device to record distance (mi), steps, EE (kcal; kcal/kg), SA (deep, light, REM, total sleep; h) and HR (bpm). Devices included age (y), height (cm), mass (kg), and sex for metrics and continued wear excluding device charge and data export every 15 ± 3 d. Inclusion criteria required ≥ 80% 24 h wear time (WT) ≥ 50% maximum WT. EE was captured as kilocalories burned during activity. Overuse injury data were sourced from OCS physical therapists. Data post-injury date were omitted. Data were shown as median [Q1, Q3]. Device metrics were compared between MSKI and noMSKI via Mann-Whitney U-test (α = 0.05). RESULTS 69 recruits (23 women, 24 [22, 27] y, 172 [166, 178.5] cm, 73.7 [67.6, 84.9] kg) were included minus dropouts (n = 52), those with unmet WT (n = 26), or lost devices (n = 2). Daily device metrics were as follows: absolute EE: 1261 [751.2, 1910] kcal, relative EE: 17.04 [10.07, 25.79] kcal/kg, day HR: 86 [74, 100] bpm, sleep HR: 56 [49, 63] bpm, deep sleep: 1.03 [0.53, 1.87] h, light sleep: 2.77 [1.98, 3.63] h, REM sleep: 0.43 [0, 1.28] h, total sleep: 5.02 [3.72, 6.08] h, steps: 20529 [16344, 24354], and distance: 11.09 [8.50, 13.47] mi. 21 recruits (30.4%, 8 women) sustained an overuse injury (strains: 47.6%, 5 women). MSKI had significantly more daily absolute EE (1624 [925, 2479] vs 1224.5 [749.5, 1786] kcal, p < 0.001), relative EE (22.32 [13.58, 33.33] vs 16.42 [9.90, 23.89] kcal/kg, p < 0.001), higher day HR (90 [78, 104] vs 86 [73, 99] bpm, p < 0.001) and sleep HR (59 [48, 62] vs 55 [48, 62] bpm, p < 0.001), more deep sleep (1.22 [0.62, 2.04] vs 0.93 [0.48, 1.75] h, p < 0.001), light sleep (2.99 [2.03, 3.80] vs 2.75 [2, 3.58] h, p < 0.001), less REM sleep (0.28 [0, 1.10] vs 0.52 [0, 1.33] h, p = 0.001) and more total sleep (5.22 [3.91, 6.15] vs 4.88 [3.65 5.93] h, p = 0.012) than noMSKI. Daily steps (21102 [16999, 24710] vs 20696 [16610, 24446], p = 0.265) and distance (11.35 [8.72, 13.53] vs 11.25 [8.75, 13.59] mi, p = 0.985) were similar between groups. CONCLUSION Greater cardiometabolic activity and altered sleep architecture from more deep and light sleep and less REM sleep were found in MSKI recruits under similar physical activity to suggest overuse injury risk signs. SIGNIFICANCE/NOVELTY Wearable devices are crucial for military practitioners to detect shifts in mediator activity for overuse injury prevention.  ONR N00014-20-C2020 Mid Atlantic Regional Chapter of the American College of Sports Medicine  46th Annual Scientific Meeting, November 3rd - 4th, 2023 Conference Proceedings International Journal of Exercise Science, Issue 9, Volume 12 

Continuous Monitorization of Physiologic Mediators of Allostasis Indicate Overuse Injury Risk in Marine Officer Candidates

https://digitalcommons.wku.edu/cgi/viewcontent.cgi?article=7969&context=ijesab

Continuous Monitorization of Physiologic Mediators of Allostasis Indicate Overuse Injury Risk in Marine Officer Candidates

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