REF-944 · Ruuska et al., 2012 · Frontiers in Physiology, Vol. 3, article · Paper · PubMed · Free full text

Self-rated mental stress and exercise training response in healthy subjects

Blimited evidenceMeasured on non-athletesWritten before October 2026, being re-checked

The authors hypothesised that baseline self-rated mental stress influences the response to aerobic training, which in healthy subjects varies from almost none to a 40% increase in aerobic fitness.

Forty-four healthy sedentary subjects (22 women) trained under laboratory control for 2 weeks, five sessions a week at 75% of maximum heart rate for 40 min/session; 14 served as controls. Before training, each rated their mental stress from 1 (low psychological resources and a lot of stressors) to 10 (high psychological resources and no stressors).

Peak oxygen uptake rose in the training group and not in controls. Within the training group, the baseline rating correlated with the change in maximal power and in peak oxygen uptake, in women and in men. Changes in fitness were very low or absent in subjects who rated their resources low and their stressors many.

Participants

44 healthy sedentary subjects (22 women) in the training group and 14 controls. Ages are not given in the abstract.

Protocol

Laboratory-controlled training for 2 weeks: five sessions a week, 75% of the maximum heart rate, 40 min/session.
Before training, participants rated their own mental stress from 1 (few psychological resources, many stressors in life) to 10 (plenty of psychological resources, no stressors in life).
Outcomes: peak oxygen uptake and maximal power before and after.

Key Results

In the training group, mean peak oxygen uptake rose from 34 ± 7 ml kg(-1) min(-1) to 37 ± 7 (p < 0.001); the control group did not change (34 ± 7 before and after, ml kg(-1) min(-1)).
Self-rated stress at baseline correlated with how much fitness changed — maximal power: r = 0.45, p = 0.002 (W/kg); peak oxygen uptake: r = 0.32, p = 0.039 (ml kg(-1) min(-1)).
In both sexes: r = 0.44, p = 0.039 (female) and r = 0.43, p = 0.045 (male) for ΔW/kg.
Fitness changes were very low or absent in subjects who rated their psychological resources low and reported a lot of stressors.

Practical Application

"Does stress at work or home change what I get from training?" In 44 healthy sedentary adults on an identical, lab-controlled 2-week programme, those who rated their psychological resources higher and stressors fewer beforehand gained more (r = 0.45 with the change in maximal power, r = 0.32 with the change in peak oxygen uptake); the most stressed gained very little or nothing. The same training load does not buy the same adaptation in a high-stress period.
Ask the question before a block: a simple 1-to-10 self-rating was enough to separate responses here. Subjective self-report as a monitoring tool is supported more broadly by REF-368.
Inference, not tested here: in a high-stress week, holding the plan steady or trimming it is a more reasonable expectation than progression; the study did not test changing the load by stress.
Not from this paper; the base's own practice: a week broken by work or family is restarted from the calendar, not repaid (SYNTH-72).

Limitations

Correlational: stress was measured once and not manipulated; unmeasured factors (sleep, for example) may explain the association.
Sedentary subjects and a 2-week programme; transfer to trained athletes and to longer blocks is an inference.
A single-item rating that mixes stressors and psychological resources.
Correlations are moderate (r = 0.32 to 0.45).
Written from the abstract and record metadata only (full text not read).
How this entry was checked and changed
Why this level

the finding is a correlation inside the training group; stress was rated once, not manipulated