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Can strength exercise affect the muscle oxygen saturation response?

Miranda-Fuentes Claudia, Chirosa-Rios Luis, Guisado-Requena Isabel, García-Pinillos Felipe, Del-Cuerpo Indya, López-Fuenzalida Antonio, Ibacache-Saavedra Paulina, Jerez-Mayorga Daniel

Acta of Bioengineering and Biomechanics

2022

Vol. 24, no. 2

37--45

The objective of the study was to describe and compare the acute response of muscle oxygen saturation (SmO2) and hemoglobin concentration (Hgb) in the vastus lateralis (VL) during resistance exercise protocols until failure. Methods: Sixteen males were considered (mean ± SD, age = 36.12 ± 6.40 years). Two familiarization sessions and one evaluation session were carried out where three force protocols were executed in the VL, one of them was isometric load (P1) and two of dynamic load (P2 and P3). SmO2 [%] and Hgb [g/dL] were measured before and after each of these protocols. For P1, three series of 8 s of maximum isometric strength with the rest of 60 s between each set, the average isometric strength (AIS), and the isometric peak strength (IPS) were also recorded. After five minutes, P2 was performed, with an initial load of 40% of AIS. Then, at 30 minutes, P3 was performed considering an initial load of 40% of IPS. Results: The results suggest (I) minimum levels of SmO2 (66.31 ± 9.38%) and Hgb (12.22 ± 0.55 g/dL) during P2, (II) no significant differences were observed between the average loads of the respective protocols for SmO2 and (III) muscle Hgb differed significantly between rest with P1 and P3. Conclusions: Exercises of increasing intensity and of short duration do not significantly modify SmO2. However, Hgb increases substantially compared baseline values.

Level of strength-speed abilities of footballers

Król H., Sobota G., Nawrat A.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

2006

z. 26

203-206

The aim of work was to determine the level of strength-speed preparation of footballers at the beginning and at the end of preparatory period, on the base of vertical jump performance. Trials were recorded with piezoelectric force platform KISTLER 9182C. No significant differences in values of jump height as well as of average and maximal power were found. It could indicate lack of significant effect of exercises, applied in training of footballers with high sport level, on the level of force-velocity preparations.