The Positive Impacts of External Focus of Attention on Performance, Fatigue, and Affect on a Fatiguing Task

Creating strategies to enhance athletic performance and delay the onset of fatigue remains a paramount objective within coaching and sports science. These advancements are typically achieved through a combination of rigorous training regimens, optimized nutritional intake, and targeted psychological interventions. A recent study delves into the nuanced effects of attentional focus on motor performance, physiological fatigue markers, muscle activation, muscle oxygenation, perceived exertion, and emotional affect during a sustained, fatiguing wall-sit task. The findings suggest that directing attention externally can significantly improve endurance and alter subjective experiences of exertion and discomfort.

Study Overview and Key Findings

The research, published in Frontiers in Psychology, investigated how participants’ focus of attention (FoA) influenced their ability to perform a wall-sit exercise to exhaustion. Sixty physically active individuals completed two wall-sit trials, each under a different attentional condition: internal focus (attending to bodily sensations) or external focus (attending to cues outside the body related to the task’s goal).

The study revealed several significant outcomes:

• Enhanced Time to Failure: Participants who adopted an external FoA were able to maintain the wall-sit position for a significantly longer duration compared to those who focused internally. This suggests that an external focus can prolong endurance in isometric fatiguing tasks.
• Reduced Perceived Exertion (RPE) and Unpleasantness: Participants in the external FoA condition reported lower levels of perceived exertion and less unpleasantness, particularly as the task neared its end. This indicates that an external focus may mitigate the subjective experience of fatigue.
• No Significant Differences in Physiological Markers: Despite improvements in performance and subjective experience, the study found no significant differences between the internal and external FoA conditions in measures of physiological fatigue (Median Power Frequency or MDF), muscle activation (electromyography or EMG), or muscle oxygenation (near-infrared spectroscopy or NIRS). However, significant changes in these physiological markers were observed from the beginning to the end of each task, indicating that the wall-sit exercise itself induced substantial physiological strain in both conditions.

Background: The Science of Attentional Focus

The concept of attentional focus has long been a cornerstone of motor learning and performance theories. As articulated by Guthrie (1952), optimal skill performance involves achieving a desired outcome with both certainty and minimal energy expenditure. This efficiency is often associated with the ability to perform movements fluently and with reduced physical and mental effort, a hallmark of expertise.

Researchers have broadly categorized attentional focus into two types:

• Internal Focus: Directing attention inward, towards bodily sensations, muscle movements, or joint positions (e.g., "feel your quads contracting," "rotate your shoulder").
• External Focus: Directing attention outward, towards the environment or the intended outcome of the movement (e.g., "watch the ball," "aim for the target," "visualize the trajectory").

Over the past two decades, a substantial body of research has consistently demonstrated the benefits of an external FoA for enhancing motor skill performance and learning across various domains, including sports, rehabilitation, and general physical activity. A meta-analysis by Chua et al. (2021) confirmed the superiority of external focus over internal focus for both performance and learning, irrespective of age, health status, or skill level. This effect is often explained by the constrained action hypothesis, which posits that an internal focus can interfere with the automatic control of movement by promoting conscious monitoring, thereby disrupting the natural flow of motor execution. Conversely, an external focus allows the motor system to self-organize more efficiently, leading to smoother and more effective movement.

However, the relationship between FoA and performance is not always straightforward. Some research suggests that an internal focus might be beneficial for beginners in specific contexts, potentially aiding in the initial conceptualization and rule-based learning of a new skill. This aligns with the concept of "reinvestment," where individuals consciously monitor their movements to automatize them.

Experimental Design and Methodology

To investigate these effects, the researchers employed a controlled experimental design. Sixty physically active participants, aged 18-30, volunteered for the study. They were required to have no physical or psychological limitations that would hinder their participation in wall-sit tasks and were instructed to abstain from exercise for at least 12 hours prior to the experiment.

The study design replicated aspects of previous research by Lohse and Sherwood (2011), with the addition of comprehensive physiological measurements. Participants underwent a single 60-minute laboratory visit. After providing informed consent and completing demographic questionnaires, they were familiarized with the wall-sit task and the experimental procedures.

Each participant performed two wall-sit trials to exhaustion, separated by a 10-minute rest period to mitigate fatigue carryover. The order of the internal and external FoA conditions was counterbalanced across participants to minimize order effects. Throughout each trial, the following variables were meticulously recorded:

• Time to Failure: The primary performance metric, measured in seconds, representing the duration participants could maintain the wall-sit position.
• Physiological Fatigue (MDF): Assessed using surface electromyography (EMG) to measure changes in the median power frequency of muscle activity, indicative of neuromuscular fatigue.
• Muscle Activation: Measured via EMG to quantify the amplitude of muscle electrical activity in the vastus lateralis.
• Muscle Oxygenation (SmO₂): Monitored using near-infrared spectroscopy (NIRS) to track oxygen saturation levels in the vastus lateralis.
• Perceived Exertion (RPE): Assessed using the Borg Rating of Perceived Exertion scale.
• Affect (Unpleasantness): Measured using the Feelings Scale.

These subjective measures (RPE and unpleasantness) were collected at two key time points: within the first 20 seconds of the task (beginning) and within the last 20 seconds (end), to capture changes in perception throughout the fatiguing process.

Attentional Cues and Task Execution

The specific instructions for each FoA condition were carefully crafted to elicit the desired attentional focus:

• Internal FoA: Participants were instructed to "mentally focus on the position of your thighs, trying to keep them parallel to the floor to minimize any movement up and down." Verbal reminders were provided every 30 seconds to reinforce this internal focus.
• External FoA: Participants were instructed to "visually focus on the ‘knee-height’ blue tape placed on the rolling wall in front of them and to mentally focus on an imaginary line between the knee and the blue tape in front of you, trying to keep the lines parallel to the floor." Regular prompts reinforced attention to the blue tape and the visualized lines.

The wall-sit posture required participants to maintain a 90° ± 5° angle at both the knees and hips, with their backs flat against a wall. Anatomical markers and goniometers were used to ensure correct technique. Failure to maintain the correct posture automatically terminated the trial.

Implications for Athletes and Coaches

The findings of this study have significant practical implications for athletes, coaches, and fitness professionals. The consistent evidence supporting the benefits of external FoA in enhancing performance and reducing the perception of fatigue suggests a paradigm shift may be warranted in how coaching instructions are delivered. Many traditional coaching cues often emphasize internal bodily adjustments and muscle sensations, which, according to this research, may inadvertently hinder performance by increasing conscious effort and amplifying the perception of fatigue.

Coaches and trainers could leverage these findings by:

• Adopting External Cues: Shifting from cues like "feel your biceps contracting" to "watch the bar move towards the ceiling" or "focus on the movement of the weight."
• Enhancing Motivation and Adherence: By reducing the perceived unpleasantness and exertion associated with challenging exercises, external focus strategies might improve adherence to training programs, especially for individuals prone to fatigue or discomfort.
• Optimizing Performance in Fatiguing Conditions: For endurance-based events or prolonged efforts in sports, encouraging an external focus could provide a competitive edge by allowing athletes to sustain effort for longer periods.

The research also touches upon the psychobiological model of endurance performance, suggesting that factors like motivation, individual tolerance, and past experiences interact with physiological fatigue. An external focus may act as a psychological buffer, distracting from the negative sensory inputs associated with exertion and thereby allowing for greater persistence.

Limitations and Future Directions

While the study provides valuable insights, certain limitations are noted. The reliance on self-reported adherence to the 12-hour pre-exercise abstention criterion could be a factor. Additionally, performing both wall-sit tasks within a single session, despite a 10-minute rest, might still have influenced fatigue levels for the second trial. Future research could explore longer recovery periods or multi-day training protocols to examine the effects of FoA on learning and adaptation over time.

The exclusion of antagonist muscle activity (e.g., hamstring activity during the wall-sit) is another area for future investigation, as co-contraction can play a role in joint stability. Furthermore, the study did not employ neuroimaging techniques like electroencephalography (EEG) to directly measure cognitive load or cortical resource allocation. Incorporating EEG could provide objective evidence of how internal versus external focus impacts brain activity and attentional demands, potentially revealing differences in neural efficiency.

Finally, extending the investigation to dynamic strength training exercises, as well as various sport-specific applications (e.g., soccer, volleyball, tennis), would offer a broader understanding of the generalizability of these findings across different movement modalities and skill levels.

Conclusion

In conclusion, this research underscores the powerful influence of attentional focus on motor performance, perceived exertion, and affect during fatiguing tasks. The findings strongly suggest that adopting an external focus of attention can lead to superior performance, characterized by a prolonged time to failure in isometric wall-sit exercises. This improvement appears to be linked to a reduced perception of exertion and unpleasantness, rather than a direct alteration of physiological fatigue markers like MDF or muscle activation. These insights offer practical guidance for coaches and athletes seeking to optimize performance and manage fatigue effectively, highlighting the importance of mindful instruction and cueing in training environments. By strategically guiding attention outward, individuals may unlock greater endurance and a more positive subjective experience during challenging physical endeavors.