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2 Acta of Bioengineering and Biomechanics

2 2022

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Reliability of the RunScribe™ system to determine kinematic variables of the pelvis during locomotion at different speeds

Marcos-Blanco Aitor, García-Pinillos Felipe, Molina-Molina Alejandro, Jaén-Carrillo Diego, Soto-Hermoso Víctor, Ruiz-Alias Santiago

Acta of Bioengineering and Biomechanics

2022

Vol. 24, no. 3

83--90

The aim of this study was to determine the reliability of the RunScribe™ system to measure kinematic variables of the pelvis during walking and running. Methods: In this study, a treadmill protocol was implemented where the participants (n = 23) completed 3 sets of 1 minute at 5, 10 and 15 km/h. Results: All the recorded measurements during walking reported a low reliability with coefficients of variation (CV) greater than 10% in all variables and small-moderate intraclass correlation coefficient (ICC) (<0.6) in seven out of ten variables. Similarly, the CVs reported in running were greater than 10%, except for the maximum angular rate in the obliquity of the pelvis and the vertical oscillation that together with the angular velocity variables showed almost perfect ICCs (>0.92). Conclusions: Therefore, the data obtained suggests that the RunScribe™ system with 3 IMUs does not provide reliable metrics about the kinematics of the pelvis during locomotion (i.e., walking and running).

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.