International Journal of Human Movement and Sports Sciences Vol. 12(6), pp. 983 - 992
DOI: 10.13189/saj.2024.120609
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Comparative Regional Hypertrophic Effects of Two Once-Weekly Resistance Training Programs on Quadriceps Muscle

Ratanyoo Longrak , Wirat Sonchan ^*
Faculty of Sport Science, Burapha University, Thailand

ABSTRACT

This study aimed to investigate the regional hypertrophic effects of two different once-weekly resistance training programs on the quadriceps muscle. Eighteen untrained men (Age: 21.1±0.5 years, Height: 174.1±5.3 cm, Body weight: 68.8±11.3 kg) with no prior resistance training experience were recruited. Participants were randomly assigned to one of two once-weekly training programs: a Mechanical Tension program (TN) or a Mechanical Tension with Metabolic Stress program (TS), both progressively designed over 6 weeks. Quadriceps muscle cross-sectional areas (QCSA) were measured using magnetic resonance imaging (MRI) at three regions—proximal, middle, and distal—before and after training. The finding demonstrated that QCSA significantly increased in the proximal region (∆9.97%, ES = Moderate, and ∆8.9%, ES = Moderate), middle region (∆8.19%, ES = Moderate, and ∆8.42%, ES = Moderate), and distal region (∆7.73%, ES = Moderate, and ∆7.76%, ES = Moderate) for the TN and TS groups, respectively. Maximum strength also significantly increased in both group (∆26.83% in TS and ∆19.82% in TN with ES = Large). Additionally, strong to very strong positive correlations were found among the different regions (r = 0.82–0.94, p = 0.000), which may suggest that measuring a single region could be sufficient for those with budgetary constraints. In conclusion, both training programs effectively induced quadriceps hypertrophy, as well as resulting in increased maximum strength, in untrained participants, highlighting the effectiveness of one-weekly training in promoting muscle growth. Additionally, the knee extension exercise demonstrated the ability to induce relatively uniform hypertrophy across all quadriceps regions.

KEYWORDS
Quadriceps Muscle, Cross-Sectional Area, Hypertrophy Training

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Ratanyoo Longrak , Wirat Sonchan , "Comparative Regional Hypertrophic Effects of Two Once-Weekly Resistance Training Programs on Quadriceps Muscle," International Journal of Human Movement and Sports Sciences, Vol. 12, No. 6, pp. 983 - 992, 2024. DOI: 10.13189/saj.2024.120609.

(b). APA Format:
Ratanyoo Longrak , Wirat Sonchan (2024). Comparative Regional Hypertrophic Effects of Two Once-Weekly Resistance Training Programs on Quadriceps Muscle. International Journal of Human Movement and Sports Sciences, 12(6), 983 - 992. DOI: 10.13189/saj.2024.120609.