Immediate, Residual, and Cumulative Effects of Fartlek, Hill Circuit, and Roll-On Training Modalities: A Comprehensive Examination of Conditioning in Long-Distance Runners
Immediate, Residual, and Cumulative Effects of Fartlek, Hill Circuit, and Roll-On Training Modalities: A Comprehensive Examination of Conditioning in Long-Distance Runners
This randomized controlled trial will compare Fartlek, hill circuit, and roll-on training in well-trained long-distance runners. Twenty-one eligible runners will be randomly assigned to one of three training groups and will complete a 12-week intervention comprising 24 prescribed training sessions. The study will evaluate immediate responses to conditioning, 24-hour recovery responses, and cumulative changes in running performance, aerobic fitness, and training-related responses. Outcomes will include heart rate, blood lactate concentration, rating of perceived exertion, delayed-onset muscle soreness, recovery and wellness indicators, internal training load, 5-km time-trial performance, and VO₂max. The findings will provide evidence regarding the comparative responses to these three conditioning modalities in well-trained long-distance runners.
Inclusion Criteria:
Long-distance runners aged 18-25 years. VO₂max >60 mL/kg/min. Weekly training volume ≥60 km/week. At least 4 years of structured long-distance running training experience. Mercier score >600. Regular participation in structured long-distance running training. Willingness to participate in the 12-week intervention and complete all required assessments.
Ability and willingness to provide written informed consent.
Exclusion Criteria:
Current musculoskeletal injury that limits running or participation in vigorous exercise.
Cardiovascular, respiratory, metabolic, neurological, or other medical conditions that contraindicate vigorous exercise.
Use of medications or treatments that could substantially affect exercise performance or physiological responses.
Participation in another experimental intervention or structured training program that could substantially affect the study outcomes.
Any condition identified during screening that makes participation unsafe or prevents completion of the study assessments.
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Long-distance running places substantial physiological and mechanical demands on athletes. Appropriate conditioning is therefore important for developing the capacity to tolerate training stress, recover effectively, and maintain or improve running performance. Different conditioning modalities may impose distinct physiological and mechanical demands, which may result in differences in immediate exercise responses, post-exercise recovery, training load, and longer-term adaptation.
This randomized controlled trial will compare three conditioning modalities. Fartlek training, hill circuit training, and roll-on training in well-trained long-distance runners. Twenty-one eligible runners will be randomly allocated to one of three parallel training groups: the Fartlek Training Group, Hill Circuit Training Group, or Roll-On Training Group. Each group will complete its assigned conditioning modality for 12 weeks, comprising 24 prescribed training sessions.
The study will examine three dimensions of response to conditioning. Immediate responses will include physiological and perceptual responses measured during or immediately after training. Residual responses will focus on recovery-related responses during the 24 hours following conditioning sessions. Cumulative responses will examine changes that develop over repeated exposure to the training intervention, including changes in running performance and aerobic fitness.
Repeated measurements will be collected throughout the intervention to characterize responses to the three conditioning modalities. Measures will include heart rate, blood lactate concentration, rating of perceived exertion, delayed-onset muscle soreness, recovery and wellness indicators, internal training load, 5-km time-trial performance, and VO₂max. Training-load measures will be derived from session rating of perceived exertion and session duration and will be used to characterize the training demands accumulated during the intervention.
The study will compare the response patterns among the three intervention groups to determine whether Fartlek, hill circuit, or roll-on training produces different immediate, residual, and cumulative responses in well-trained long-distance runners. The findings are intended to contribute evidence for the selection and progression of conditioning modalities while considering training stimulus, recovery, and performance-related responses.