High-Intensity Functional Training Improves Cardiorespiratory Fitness and Neuromuscular Performance Without Inflammation or Muscle Damage

• Georgios Posnakidis ^[1] ; George Aphamis ^[1] ; Christoforos D. Giannaki ^[1] ; Vassilis Mougios ^[2] ; Panagiotis Aristotelous ^[1] ; George Samoutis ^[1] ; Gregory C. Bogdanis ^[3]
  1. [1] University of Nicosia

     University of Nicosia

     Chipre

     
  2. [2] Aristotle University of Thessaloniki

     Aristotle University of Thessaloniki

     Dimos Thessaloniki, Grecia

     
  3. [3] National and Kapodistrian University of Athens

     National and Kapodistrian University of Athens

     Dimos Athens, Grecia

     

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• Localización: Journal of strength and conditioning research: the research journal of the NSCA, ISSN 1064-8011, Vol. 36, Nº. 3, 2022, págs. 615-623
• Idioma: inglés
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• Resumen

  • We examined the effects of high-intensity functional training (HIFT) on cardiorespiratory and neuromuscular performance, as well as on inflammatory and muscle damage markers. Thirteen physically active healthy volunteers (aged 28.3 +/- 3.8 years, 5 men and 8 women) underwent 8 weeks of a group HIFT program performed 3 times per week. Each session consisted of 4 rounds of a 9-exercise circuit (30-second exercise and 15-second recovery). During the first and last weeks of training, venous blood was sampled daily to monitor changes in serum C-reactive protein (CRP) and creatine kinase (CK). After 8 weeks of HIFT, body fat decreased by 0.64 +/- 1.01 kg (p = 0.041), maximal oxygen uptake improved by 1.9 +/- 2.2 ml[middle dot]kg-1[middle dot]min-1 (p = 0.009), countermovement jump by 2.6 +/- 1.5 cm (p = 0.001), bench press 1-repetition maximum (1RM) by 4.5 +/- 3.8 kg (p = 0.001), maximum number of bench press repetitions at 65% 1RM by 4 +/- 5 repetitions (p = 0.03), and abdominal muscle endurance by 6 +/- 4 repetitions (p < 0.001). In both week 1 and week 8 of training, CK increased mildly in the morning after the first session of the week (main effect for day, p = 0.008), whereas no significant changes were observed in CRP (p = 0.31). During week 8, CK on all days was ~32% lower compared with week 1 (160 vs. 235 U[middle dot]L-1; main effect of week 1 vs. week 8, p = 0.027), whereas CRP remained unchanged (p = 0.225). This HIFT program was effective in improving cardiorespiratory and neuromuscular physical fitness without causing significant inflammation or muscle damage in physically active subjects.