Engaging in resistance exercises might contribute to enhanced longevity, as suggested by a substantial new investigation, although the findings indicate that the impact on mortality risk is contingent upon the duration of commitment.
An optimal weekly engagement of 90 to 119 minutes emerged as the most advantageous threshold, correlating with a 13 percent diminished probability of succumbing to any cause over a three-decade span.
An increased volume of activity beyond this point did not yield proportional advantages; the statistical analysis revealed no further attenuation of mortality risk for durations of 120 minutes or more per week.
A cohort comprising 147,374 individuals was meticulously examined by a research contingent from the Harvard T.H. Chan School of Public Health. This analysis drew upon data accumulated from three long-standing prospective studies: the Health Professionals Follow-up Study, the Nurses’ Health Study, and the Nurses’ Health Study II.
The role of aerobic conditioning was also a significant factor. Individuals who coupled consistent resistance training with ample cardiovascular activity exhibited the lowest mortality rates.
The investigative team posits that their findings address crucial inquiries pertaining specifically to resistance training modalities.
“The life-extending advantages of aerobic physical exertion are well-documented,” note the investigators in their published report. write
“Nevertheless, the influence of resistance training on mitigating all-cause mortality and mortality tied to specific diseases, its dose-response dynamics, and its synergistic effects with aerobic exercise have remained less elucidated.”
All participants within the study were drawn exclusively from the health professional sector. A substantial majority, precisely 74 percent, adhered to the recommended 150 minutes of moderate aerobic activity each week, encompassing pursuits such as running or racquetball. Furthermore, 46 percent of these individuals incorporated some regimen of regular strength training, including exercises like squats or weightlifting.
Beyond the general reduction in mortality risk, those dedicating between 90 and 119 minutes weekly to strength-building activities demonstrated a 19 percent reduced susceptibility to cardiovascular disease-related mortality and a 27 percent lower likelihood of expiring from neurological conditions, such as Alzheimer’s disease.
Aerobic exercise was quantified utilizing MET (metabolic equivalent of task) hours, a metric designed to gauge the energy expenditure of an activity relative to a state of sedentary rest.
The energy expenditure associated with sitting in a resting state is established as the benchmark of 1 MET, with all other activities subsequently assessed in comparison to this baseline.
For instance, accumulating 150 minutes of moderate aerobic exercise equates to 7.5 MET hours, signifying an energy expenditure 7.5 times greater than that experienced during repose.
This particular category of exercise demonstrated even more pronounced benefits concerning lifespan extension, aligning with prior research findings.
Individuals achieving a minimum of 45 MET-hours of aerobic activity weekly experienced a fortuitous reduction in mortality risk ranging from 42 to 47 percent, irrespective of their engagement in strength training.
When considering a combined approach of both aerobic and resistance training, the most significant attenuation of mortality risk was observed in participants who engaged in 30–44 MET-hours of aerobic exercise weekly, complemented by 60–119 minutes of strength training.
This synergistic regimen was correlated with a 45 percent diminished risk of mortality.
“Our integrated analysis of resistance and aerobic modalities revealed the lowest mortality risk among participants who concurrently participated in both types of exercise, a finding that resonates with preceding investigations,” state the researchers. write
“Crucially, we noted that while either adequate aerobic or resistance training independently contributed to a reduced mortality risk, aerobic activity conferred a more substantial benefit.”
It is imperative to acknowledge that this study does not establish a direct causal link between exercise and increased longevity. Its observational design focused on identifying correlations between pre-existing lifestyle habits and health outcomes.
Furthermore, the reliance on self-reported exercise data from participants introduces a potential margin of imprecision in the collected records.
Nevertheless, the sheer magnitude of the study’s participant pool and the extensive longitudinal data collected over many years render it a valuable resource for understanding the advantages conferred by strength training.
A commitment of approximately one to two hours per week may suffice to realize tangible benefits, and integrating strength training with aerobic conditioning appears to be the most effective strategy for promoting longevity, in conjunction with a multitude of other contributing factors.
The research team expresses a keen interest in expanding their analysis to explore how different forms of exercise might influence not only the quality of life but also the “healthspan”—the duration an individual maintains good health, mobility, and autonomy.
“Our observations concerning the varied dose-response relationships between sustained resistance training and both all-cause and cause-specific mortality suggest that distinct quantities of resistance exercise may be required to maximize benefits across different health endpoints,” state the authors. write
