The effects of short-term exercise training on peak-torque are time- and fiber-type dependent

Ureczky, D [Ureczky, Dóra (Sporttudomány), szerző] Biomechanika Tanszék (SE / TF); Vacz, G [Vácz, Gabriella (Élettan), szerző] Klinikai Kísérleti Kutató- és Humán Élettani In... (SE / AOK / I); Costa, A; Kopper, B [Kopper, Bence (biomechanika), szerző] Biomechanika Tanszék (SE / TF); Lacza, Z [Lacza, Zsombor (Agyi vérkeringés ...), szerző] Klinikai Kísérleti Kutató- és Humán Élettani In... (SE / AOK / I); Hortobagyi, T [Hortobágyi, Tibor (Mozgástudomány), szerző]; Tihanyi, J [Tihanyi, József (Élettan), szerző] Biomechanika Tanszék (SE / TF)

Angol nyelvű Tudományos Szakcikk (Folyóiratcikk)
  • SJR Scopus - Physical Therapy, Sports Therapy and Rehabilitation: D1
    We examined the susceptibility of fast and slow twitch muscle fibers in the quadriceps muscle to eccentric exercise induced muscle damage. Nine healthy males (age: 22.5+/-1.6 years) performed maximal eccentric quadriceps contractions at 120 degrees /s over a 120 degrees of knee joint range of motion for six consecutive days. Biopsies were taken from the vastus lateralis muscle before repeated bouts of eccentric exercise, on the third and seventh day. Immunohistochemical procedures were used to determine fibre composition and fibronectin activity. Creatine kinase (CK) and lactate dehydrogenise (LDH) were determined in serum. Average torque was calculated in each day for each subject. Relative to baseline, average torque decreased 37.4% till day 3 and increased 43.0% from the day 3 to day 6 (p<0.001). CK and LGH were 70.6 and 1.5 times higher on day 3 and 75.5 and 1.4 times higher on day 6. Fibronectin was found in fast fibres in subjects with high CK level on Day 3 and 7 after exercise, but on Day 7 fibronectin appeared in both slow and fast fibres except in muscles of two subjects with high fast fiber percentage. Peak torque and muscle fiber type composition measured at baseline showed a strong positive association on Day 3 (r = 0.76 p < 0.02) and strong negative association during recovery between Day 3 to Day 6 (r = -0.76, p < 0.02) and Day 1 to Day 6(r = 0.84 p < 0.001). We conclude that damage of fast fibers preceded the damage of slow fibers and muscles with slow fiber dominance were more susceptible to repeated bouts of eccentric exercise than fast fiber dominance muscles. The data suggest the responses to repeated bouts of eccentric exercise are fiber type-dependent in the quadriceps muscle which can be the basis for the design of individualized strength training protocols.
    Hivatkozás stílusok: IEEEACMAPAChicagoHarvardCSLMásolásNyomtatás
    2021-10-17 03:16