Higher resistance training volume offsets muscle hypertrophy nonresponsiveness in older individuals.

The magnitude of muscle hypertrophy in response to resistance training (RT) is highly variable between individuals (response heterogeneity). Manipulations in RT variables may modulate RT-related response heterogeneity; yet, this remains to be determined. Using a within-subject unilateral design, we aimed to investigate the effects of RT volume manipulation on whole muscle hypertrophy [quadriceps muscle cross-sectional area (qCSA)] among nonresponders and responders to a low RT dose (single-set). We also investigated the effects of RT volume manipulation on muscle strength in these responsiveness groups. Eighty-five older individuals [41M/44F, age = 68 ± 4 yr; body mass index (BMI) = 26.4 ± 3.7 kg/m2] had one leg randomly allocated to a single (1)-set and the contralateral leg allocated to four sets of unilateral knee-extension RT at 8-15 repetition maximum (RM) for 10-wk 2 days/wk. Pre- and postintervention, participants underwent magnetic resonance imaging (MRI) and unilateral knee-extension 1-RM strength testing. MRI typical error (2× TE = 3.27%) was used to classify individuals according to responsiveness patterns. n = 51 were classified as nonresponders (≤2× TE) and n = 34 as responders (>2× TE) based on pre- to postintervention change qCSA following the single-set RT protocol. Nonresponders to single-set training showed a dose response, with significant time × set interactions for qCSA and 1-RM strength, indicating greater gains in response to the higher volume prescription (time × set: P < 0.05 for both outcomes). Responders improved qCSA (time: P < 0.001), with a tendency toward higher benefit from the four sets RT protocol (time × set: P = 0.08); on the other hand, 1-RM increased similarly irrespectively of RT volume prescription (time × set: P > 0.05). Our findings support the use of higher RT volume to mitigate nonresponsiveness among older adults.NEW & NOTEWORTHY Using a within-subject unilateral design, we demonstrated that increasing resistance training (RT) volume may be a simple, effective strategy to improve muscle hypertrophy and strength gains among older adults who do not respond to low-volume RT. In addition, it could most likely be used to further improve hypertrophic outcomes in responders.

An umbrella systematic review of the effect of physical exercise on mental health of women in menopause.

IMPORTANCE: The menopausal transition has been related to worsening mental health. The literature also points out that being physically active during menopause is associated with a favorable effect on climacteric symptoms, specifically on psychological aspects. OBJECTIVES: The aims of the study are to analyze the effects of physical activity on mental health during menopause through an umbrella review and to evaluate the quality of the included Systematic Reviews and meta-analyses (MAs). EVIDENCE REVIEW: A MeaSurement Tool to Assess Systematic Reviews was used to evaluate the methodological quality of the included studies and the Grading of Recommendations Assessment, Development and Evaluation was applied to assess the level of the evidence of the results. In addition, the effect size of the revised meta-analyses (MAs) was calculated. FINDINGS: A total of 9 systematic reviews/MAs were included, published between 2014 and 2020. In the A MeaSurement Tool to Assess Systematic Reviews methodological quality assessment, 8 studies were classified as "high quality" and 1 as "low quality." In terms of quality of the evidence for each result through the Grading of Recommendations Assessment, Development and Evaluation classification, approximately 75% of the studies were classified as "moderate quality," 22.2% as "high quality," and 22.2% as "low quality," with the greatest bias concerning the high heterogeneity of the included studies. In addition, the studies showed low overlap. Despite the high heterogeneity, we can highlight the importance of the practice of physical activity by women in menopause, to prevent and/or reduce problems related to mental health. CONCLUSIONS AND RELEVANCE: There was a positive effect of the interventions on depression, however, with no difference between durations (short or long). Regarding stress, the interventions applied did not show a positive effect. The studies that investigated depression linked to anxiety presented conflicting results.

Daily Leucine Intake Is Positively Associated with Lower Limb Skeletal Muscle Mass and Strength in the Elderly.

Higher daily protein intake, with an emphasis on leucine content, is thought to mitigate age-related anabolic resistance, potentially counteracting age-related morphological and functional declines. The present study investigated potential associations between total daily leucine intake and dependent variables, including quadriceps muscle cross-sectional area (CSA) and maximum dynamic muscle strength (1-RM) in a cohort of healthy free-living older individuals of both sexes (n = 67; 34/33 men/women). Participants performed three 24 h dietary recalls and underwent a magnetic resonance imaging exam followed by 1-RM tests. Our results demonstrate moderate associations between total daily leucine and both quadriceps CSA (r = 0.42; p = 0.004) and 1-RM (r = 0.45; p = 0.001). Furthermore, our exploratory biphasic linear regression analyses, adjusted for sex, age, and protein intake relative to body weight, revealed a plateau for daily leucine intake and muscle mass and muscle strength (~7.6-8.0 g·day-1) in older adults. In conclusion, we demonstrated that total daily leucine intake is associated with muscle mass and strength in healthy older individuals and this association remains after controlling for multiple factors, including overall protein intake. Furthermore, our breakpoint analysis revealed non-linearities and a potential threshold for habitual leucine intake, which may help guide future research on the effects of chronic leucine intake in age-related muscle loss.