A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
The effects of restriction pressures on the acute responses to blood flow restriction exercise (2019)


Ilett, M. J., Rantalainen, T., Keske, M. A., May, A. K., & Warmington, S. A. (2019). The effects of restriction pressures on the acute responses to blood flow restriction exercise. Frontiers in Physiology, 10, Article 1018. https://doi.org/10.3389/fphys.2019.01018


JYU-tekijät tai -toimittajat


Julkaisun tiedot

Julkaisun kaikki tekijät tai toimittajat: Ilett, Michael J.; Rantalainen, Timo; Keske, Michelle A.; May, Anthony K.; Warmington, Stuart A.

Lehti tai sarja: Frontiers in Physiology

eISSN: 1664-042X

Julkaisuvuosi: 2019

Volyymi: 10

Artikkelinumero: 1018

Kustantaja: Frontiers Media

Julkaisumaa: Sveitsi

Julkaisun kieli: englanti

DOI: https://doi.org/10.3389/fphys.2019.01018

Julkaisun avoin saatavuus: Avoimesti saatavilla

Julkaisukanavan avoin saatavuus: Kokonaan avoin julkaisukanava

Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/65406


Tiivistelmä

Purpose: No current guidelines or recommendations exist informing the selection of restriction pressure during blood flow restriction exercise (BFRE). Moreover, the effects of specific relative restriction pressures on the acute muscle, metabolic and cardiopulmonary responses to BFRE are unclear. The purpose of this study was to characterize these acute responses at different levels of restriction pressure.
Methods: Participants (n = 10) completed rhythmic isometric knee extension exercise across five experimental trials in a balanced randomized order. Three were BFRE trials {B-40 [restriction pressure set to 40% LOP (total limb occlusion pressure)]; B-60 (60% LOP); and B-80 (80% LOP)) with a workload equivalent to 20% maximal voluntary force (MVC), one was non-BFRE at 20% MVC (LL) and one was non-BFRE at 80% MVC (HL). Measurements recorded were torque, muscle activity via electromyography (EMG), tissue oxygenation via near infrared spectroscopy, whole body oxygen consumption, blood lactate and heart rate.
Results: For the LL and B-40 trials, most measures remained constant. However, for the B-60 and B-80 trials, significant fatigue was demonstrated by a reduction in MVC torque across the trial (p < 0.05). Blood lactate increased from baseline in HL, B-60, and B-80 (p < 0.05). Submaximal EMG was greater in B-60 and B-80 than LL, but lower compared with HL (p < 0.05). Tissue oxygenation decreased in HL, B-40, B-60, and B-80 (p < 0.05), which was lower in the B-80 trial compared to all other trials (p < 0.01). Whole body oxygen consumption was not different between the BFRE trials (p > 0.05).
Conclusion: We demonstrate graded/progressive acute responses with increasing applied pressure during BFRE, from which we speculate that an effective minimum "threshold" around 60% LOP may be necessary for BFRE to be effective with training. While these data provide some insight on the possible mechanisms by which BFRE develops skeletal muscle size and strength when undertaken chronically across a training program, the outcomes of chronic training programs using different levels of applied restriction pressures remain to be tested. Overall, the present study recommends 60-80% LOP as a suitable "minimum" BFRE pressure.


YSO-asiasanat: voimaharjoittelu; lihasmassa; lihasvoima; verenkierto; elektromyografia

Vapaat asiasanat: Kaatsu; blood flow restriction; muscle fatigue; EMG; limb occlusion pressure; restriction pressure


Liittyvät organisaatiot


OKM-raportointi: Kyllä

VIRTA-lähetysvuosi: 2019

JUFO-taso: 1


Viimeisin päivitys 2024-12-10 klo 04:30