Recognition: unknown
Time-dependent structural equation modeling of fans' football fever using activity tracking data during the 2025 DFB Cup final
Pith reviewed 2026-05-09 23:13 UTC · model grok-4.3
The pith
Smartwatch data and time-dependent modeling show fans' football fever follows a V-shaped trajectory during matches.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
Football fever is adequately represented as a latent variable reflected in wearable technology data and unfolds according to a V-shaped trajectory: high at kick-off, followed by a steady decline until the renewed arousal in the second half, with substantial between-fan heterogeneity in both baseline level and temporal dynamics. This pattern is captured by a time-dependent structural equation model that includes latent growth components and autoregressive effects, with model fit evaluated after adjustments for missing measurements and high data dimensionality.
What carries the argument
Time-dependent structural equation model with latent growth components for overall trends and autoregressive effects for short-term carry-over in the latent football fever process derived from heart rate and stress indicators.
If this is right
- Dynamic emotional phenomena in sports spectatorship require explicit modeling of temporal dependence to avoid biased conclusions about arousal levels.
- Wearable technology combined with structural equation modeling can adequately represent latent constructs like football fever from physiological signals.
- Substantial heterogeneity between fans in both starting levels and change patterns implies that average trajectories alone miss important individual differences.
- The V-shaped pattern ties emotional responses to specific phases of the match, such as initial excitement and second-half renewal.
Where Pith is reading between the lines
- The same modeling strategy could apply to emotional dynamics during other spectator events like concerts or public gatherings where physiological data are available.
- If the V-shape generalizes, event organizers might use it to time interventions that counteract mid-event dips in audience engagement.
- Individual differences in fever trajectories could be linked to measurable traits such as team loyalty or prior match experience in follow-up studies.
- Extending the approach to non-sports contexts might reveal whether V-shaped emotional responses are specific to competitive matches or common to other high-arousal situations.
Load-bearing premise
Heart rate and stress readings from smartwatches are valid and sufficient indicators of the latent football fever construct, and the time-dependent SEM captures the true dynamics without substantial bias from missing data or high dimensionality.
What would settle it
Replicating the smartwatch data collection during another high-stakes football match and finding that the estimated trajectory lacks the V-shape or that the time-dependent model with autoregressive terms shows poor fit compared to simpler alternatives would challenge the central claim.
Figures
read the original abstract
Football fans frequently exhibit pronounced emotional and physiological reactions during high-stakes matches. However, the temporal dynamics of this football fever are rarely modeled as a latent process. Using intensive longitudinal data from Arminia Bielefeld supporters who wore smartwatches during the 2025 German Football Association (DFB) Cup final, we investigate how football fever unfolds. The devices recorded heart rate, stress level, and related indicators in short intervals, allowing us to construct a latent variable for football fever and model its dynamics. We specify a time-dependent structural equation model with latent growth components and autoregressive effects to capture both overall trends and short-term carry-over effects in fans' physiological responses. Results are aggregated across multiple imputations of missing measurements. Model fit is evaluated using adjustments for the high data dimensionality. The results show that football fever follows a V-shaped trajectory: high at kick-off, followed by a steady decline until the renewed arousal in the second half, with substantial between-fan heterogeneity in both baseline level and temporal dynamics. Our findings demonstrate that football fever can be adequately represented as a latent variable using structural equation modeling and reflected by wearable technology data. This highlights the importance of accounting for temporal dependence when studying dynamic emotional phenomena, e. g., in sports spectatorship.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript applies a time-dependent structural equation model with latent growth components and autoregressive effects to intensive longitudinal smartwatch data (heart rate and stress readings) collected from Arminia Bielefeld fans during the 2025 DFB Cup final. It constructs a latent 'football fever' variable, aggregates results over multiple imputations of missing data, applies dimensionality-adjusted fit measures, and reports a V-shaped trajectory (high at kick-off, decline through the first half, renewed arousal in the second half) together with substantial between-fan heterogeneity in baseline levels and temporal dynamics.
Significance. If the measurement model proves valid and the reported dynamics are not artifacts of unvalidated indicators or imputation choices, the work offers a concrete demonstration of how consumer wearables can be integrated into latent-variable modeling of real-time emotional processes in naturalistic settings. It underscores the value of combining growth-curve and autoregressive structures for capturing both long-term trends and short-term carry-over in physiological data, potentially informing future studies of spectator affect in sports and other high-arousal contexts.
major comments (2)
- [Abstract] Abstract: the central V-shaped claim is presented without any reported parameter estimates, standard errors, significance tests for the growth factors (intercept, slope, quadratic), or autoregressive coefficients. Because the trajectory shape is defined by these parameters, their absence prevents verification that the decline-then-rise pattern is statistically supported rather than an artifact of the chosen functional form or imputation procedure.
- [Methods] Methods/Results (implied by abstract description): the measurement model treats heart-rate and stress readings as sufficient indicators of the latent football-fever construct, yet no external validation (concurrent self-reports, behavioral observations, or physiological benchmarks) or sensitivity checks for indicator validity are described. Any systematic mismatch between the wearable signals and the intended psychological process would propagate directly into the estimated growth factors and AR coefficients, undermining the substantive interpretation.
minor comments (1)
- [Abstract] Abstract: 'e. g.' should be written as 'e.g.' for standard abbreviation style.
Simulated Author's Rebuttal
We thank the referee for the detailed and constructive comments on our manuscript. We address each major point below and indicate the revisions we will make to improve the presentation and transparency of our results.
read point-by-point responses
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Referee: [Abstract] Abstract: the central V-shaped claim is presented without any reported parameter estimates, standard errors, significance tests for the growth factors (intercept, slope, quadratic), or autoregressive coefficients. Because the trajectory shape is defined by these parameters, their absence prevents verification that the decline-then-rise pattern is statistically supported rather than an artifact of the chosen functional form or imputation procedure.
Authors: We appreciate this observation. The full Results section contains the parameter estimates, standard errors, and significance tests for the intercept, linear and quadratic growth factors, and autoregressive coefficients, along with the multiple-imputation aggregation. However, we agree that the abstract should explicitly summarize these key statistics to allow readers to directly assess the statistical support for the V-shaped trajectory. We will revise the abstract to include the relevant growth-factor estimates, their standard errors, and p-values. revision: yes
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Referee: [Methods] Methods/Results (implied by abstract description): the measurement model treats heart-rate and stress readings as sufficient indicators of the latent football-fever construct, yet no external validation (concurrent self-reports, behavioral observations, or physiological benchmarks) or sensitivity checks for indicator validity are described. Any systematic mismatch between the wearable signals and the intended psychological process would propagate directly into the estimated growth factors and AR coefficients, undermining the substantive interpretation.
Authors: We acknowledge that the manuscript does not report external validation of the latent construct. The choice of heart-rate and stress indicators draws on prior physiological literature linking these wearable signals to emotional arousal in sports contexts. Because concurrent self-reports or behavioral observations were not collected in this naturalistic field study, we cannot add new validation data. In the revision we will (i) expand the Methods section with additional citations justifying the indicators, (ii) report sensitivity analyses (e.g., alternative single-indicator and two-indicator specifications), and (iii) explicitly discuss the lack of external validation as a limitation. These textual additions will clarify the scope of the claims. revision: partial
Circularity Check
No significant circularity; results emerge from data-driven SEM fitting on observed indicators
full rationale
The paper specifies a time-dependent SEM with latent growth factors and autoregressive terms, fits it to smartwatch heart-rate and stress readings, and reports the resulting V-shaped trajectory plus heterogeneity as model outputs. No step reduces by construction to its inputs: the latent construct is identified from the observed physiological indicators via the measurement model, the growth parameters are estimated rather than presupposed, and no self-citation chain, uniqueness theorem, or renaming of known results is invoked to force the V-shape. The derivation remains self-contained against the external data.
Axiom & Free-Parameter Ledger
free parameters (2)
- latent growth parameters (intercept, slope, quadratic)
- autoregressive coefficients
axioms (2)
- domain assumption Wearable heart rate and stress indicators are valid reflections of the latent football fever construct.
- domain assumption Missing measurements can be imputed without biasing the estimated trajectory or heterogeneity.
Reference graph
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