Journal of Arak University of Medical Sciences

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Auditory Steady-State Response and Auditory Brainstem Responses Thresholds in Neonate and Children with Moderate to Severe and Severe to Profound Sensorineural Hearing Loss

Maryam Delphi, Mahsa Bakhit, Mojtaba Tavakoli, Ali Nikkhah, Azadeh Saki,
Volume 16, Issue 1 (4-2013)

Abstract

Background: ASSR is the latest threshold detection technology in pediatric audiology. The aim of this study is to investigate the degree to which ASSR thresholds correlate with click-ABR thresholds.

Materials and Methods: In this cross-sectional study, 32 children ranging in age from birth to 7 years were evaluated by ASSR and ABR in moderate to severe and severe to profound hearing loss groups.

Results: The correlation coefficients for frequencies of 500, 1000, 2000, and 4000, mean of 2-4 and mean of 1-4 kHz were between 0.68- 0.90 in moderate to severe hearing loss and 0.79-0.96 in severe to profound hearing loss.

Conclusion: Strong correlations were found between ASSR and click-ABR thresholds in all frequencies. This correlation was greater for higher degrees of hearing loss.

The Effect of Four Weeks of High-intensity Interval Training on PGC-1α and VEGF Protein Contents in Skeletal Muscle of Active Men

Mahdi Bayati, Reza Gharakhanlou, Maryam Nikkhah, Sadegh Amani Shalamzari,
Volume 21, Issue 3 (6-2018)

Abstract

Background and Aim: Low-volume, high-intensity interval training (HIT) increase skeletal muscle aerobic capacity, yet little is known about the potential mechanisms in improvement of this adaptability. The purpose of present study was to examine the effect of four weeks of HIT on peroxisome proliferator-activated receptor-γ coactivator-1α (PGC-1α) and vascular endothelial growth factor (VEGF) protein contents in skeletal muscle of active men.
Materials and Methods: Eight active male students voluntarily and purposefully participated in this study. One week before the experiment started; subjects were familiar with protocol of research. Needle biopsy samples vastus lateralis were obtained 48 h before training and 72 h after the final training session. HIT protocol consisted of 11-15 bouts of 1 min cycling at ∼85-90% of reserve heart rate separated by 1 min of active recovery between each, 3 sessions per week for 4 weeks. Variables were measured by ELISA. All data were analyzed using paired t-test and at the level of significance of p ≤ 0.05.
Findings: Results of study showed the four weeks of HIT lead to significant increase in PGC-1α and VEGF (p < 0.001).
Conclusion: Our findings suggest that activation of VEGF from PGC-1α pathway is part of cellular-molecular mechanisms of high-intensity interval training. So, probably angiogenesis in skeletal muscle is one of the most important factors in improving of aerobic performance, which requires more studies.

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