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Isokinetic Strength, Vertical Jump Performance, and Strength Differences in First Line Professional Firefighters Competing in Fire Sport

Author

Listed:
  • Petr Miratsky

    (Research Sport Center, Faculty of Physical Education and Sport, Charles University, José Martího 31, 162 52 Prague, Czech Republic)

  • Tomas Gryc

    (Research Sport Center, Faculty of Physical Education and Sport, Charles University, José Martího 31, 162 52 Prague, Czech Republic)

  • Lee Cabell

    (Department of Health and Human Performance, Texas State University, San Marcon, TX 78666, USA)

  • Frantisek Zahalka

    (Research Sport Center, Faculty of Physical Education and Sport, Charles University, José Martího 31, 162 52 Prague, Czech Republic)

  • Matej Brozka

    (Research Sport Center, Faculty of Physical Education and Sport, Charles University, José Martího 31, 162 52 Prague, Czech Republic)

  • Matej Varjan

    (Research Sport Center, Faculty of Physical Education and Sport, Charles University, José Martího 31, 162 52 Prague, Czech Republic)

  • Tomas Maly

    (Research Sport Center, Faculty of Physical Education and Sport, Charles University, José Martího 31, 162 52 Prague, Czech Republic)

Abstract

The purpose of our study was to investigate peak torque (PT) of knee extensors (KE) and knee flexors (KF), bilateral and unilateral strength asymmetries in isokinetic testing and vertical jump height (JH), vertical ground reaction force (VGRF), and force differences ( Δ VGRF) between legs during different jump tests in professional first-line firefighters ( n = 15) competing in fire sports disciplines. There was a significant effect of jump type on JH (F 2,44 = 7.23, p < 0.05), VGRF (F 2,44 = 16.03, p < 0.05), and Δ VGRF (F 2,44 = 3.45, p < 0.05). Professional firefighters achieved a mean JH of 50.17 cm in the countermovement jump free arms and high PT of KEs (3.15 Nm/kg). No significant differences ( p > 0.05) and small effect sizes ( d < 0.3) were found between the legs when PTs were assessed. We found a slightly higher ( d = 0.53) unilateral strength ratio in non-dominant legs (58.12 ± 10.26%) compared to dominant legs (55.31 ± 7.51%). No effect of laterality was found among limb comparisons, but a higher unilateral isokinetic strength ratio was found in non-dominant legs of firefighters. A high level of strength (PT of KEs > 3 times body weight) and vertical jump performance is comparable to the performance of elite athletic populations.

Suggested Citation

  • Petr Miratsky & Tomas Gryc & Lee Cabell & Frantisek Zahalka & Matej Brozka & Matej Varjan & Tomas Maly, 2021. "Isokinetic Strength, Vertical Jump Performance, and Strength Differences in First Line Professional Firefighters Competing in Fire Sport," IJERPH, MDPI, vol. 18(7), pages 1-13, March.
    • Handle: RePEc:gam:jijerp:v:18:y:2021:i:7:p:3448-:d:524630
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    References listed on IDEAS

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    1. Brandon L. Stone & Brent A. Alvar & Robin M. Orr & Robert G. Lockie & Quincy R. Johnson & Jonathan Goatcher & J. Jay Dawes, 2020. "Impact of an 11-Week Strength and Conditioning Program on Firefighter Trainee Fitness," Sustainability, MDPI, vol. 12(16), pages 1-9, August.
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